| Names | |
|---|---|
| Preferred IUPAC name | 4-chloro-2-methyl-5-aminobenzenesulfonic acid |
| Other names | 2-Amino-4-chloro-5-methylbenzenesulfonic acid 4-Chloro-3-methyl-2-aminobenzenesulfonic acid C.I. Acid Yellow 17 Intermediate C Sulfanilic acid, 4-chloro-3-methyl- |
| Pronunciation | /tuː-əˈmiːnoʊ-fɔːr-ˈklɔːroʊ-faɪv-ˈmɛθɪl-ˈbɛnziːnˌsʌlˌfɒnɪk ˈæsɪd/ |
| Identifiers | |
| CAS Number | 88-44-8 |
| 3D model (JSmol) | `/data/molfile/2-ACS-5-MeBSA.mol` |
| Beilstein Reference | 1709077 |
| ChEBI | CHEBI:27645 |
| ChEMBL | CHEMBL127106 |
| ChemSpider | 122332 |
| DrugBank | DB14005 |
| ECHA InfoCard | 22-211-968-197 |
| EC Number | EC 226-789-3 |
| Gmelin Reference | 62252 |
| KEGG | C14381 |
| MeSH | D016527 |
| PubChem CID | 9842 |
| RTECS number | CY8575000 |
| UNII | 0VVL10H11H |
| UN number | UN2585 |
| Properties | |
| Chemical formula | C7H8ClNO3S |
| Molar mass | 207.65 g/mol |
| Appearance | White to light yellow crystal powder |
| Odor | Odorless |
| Density | 1.46 g/cm³ |
| Solubility in water | Slightly soluble in water |
| log P | -0.48 |
| Vapor pressure | 0.0000135 mmHg at 25°C |
| Acidity (pKa) | -1.34 |
| Basicity (pKb) | pKb = 4.47 |
| Magnetic susceptibility (χ) | -52.8×10⁻⁶ cm³/mol |
| Refractive index (nD) | 1.635 |
| Dipole moment | 3.52 D |
| Thermochemistry | |
| Std molar entropy (S⦵298) | 243.0 J·mol⁻¹·K⁻¹ |
| Std enthalpy of formation (ΔfH⦵298) | -496.4 kJ/mol |
| Std enthalpy of combustion (ΔcH⦵298) | -1584 kJ·mol⁻¹ |
| Pharmacology | |
| ATC code | '' |
| Hazards | |
| Main hazards | Harmful if swallowed. Causes skin irritation. Causes serious eye irritation. May cause respiratory irritation. |
| GHS labelling | GHS05, GHS07 |
| Pictograms | GHS07 |
| Signal word | Warning |
| Hazard statements | H315, H319, H335 |
| Precautionary statements | Precautionary statements: P261, P264, P280, P301+P312, P305+P351+P338, P330, P337+P313 |
| Flash point | > 182.2 °C |
| Lethal dose or concentration | LD50 Oral Rat 2400 mg/kg |
| LD50 (median dose) | LD50 (median dose): Oral rat LD50 > 2000 mg/kg |
| NIOSH | CY9275000 |
| PEL (Permissible) | Not established |
| REL (Recommended) | 0.2 mg/m³ |
| Related compounds | |
| Related compounds | 2-Aminobenzenesulfonic acid 4-Chloro-2-aminobenzenesulfonic acid 5-Methyl-2-aminobenzenesulfonic acid 2-Amino-5-methylbenzenesulfonic acid 4-Chloro-5-methylbenzenesulfonic acid 2-Amino-4-chlorobenzenesulfonic acid |
| Section | Details |
|---|---|
| Product Name & IUPAC Name |
Product Name: 2-Amino-4-Chloro-5-Methylbenzenesulfonic Acid IUPAC Name: 2-amino-4-chloro-5-methylbenzenesulfonic acid |
| Chemical Formula | C7H8ClNO3S |
| Synonyms & Trade Names |
In industry, 2-amino-4-chloro-5-methylbenzenesulfonic acid may appear under names reflecting its positional isomerism and use in dye intermediates, such as "4-Chloro-2-amino-5-methylbenzenesulfonic acid," "JC acid," or process-specific designations. Synonym selection depends on regional nomenclature standards and downstream user requirements. Trade names or short forms are sometimes assigned during application development or contract manufacturing, based on end-user nomenclature systems. |
| HS Code & Customs Classification |
Customs classification applies principal chemical category codes for sulfonic acids bearing an aromatic nucleus. Actual HS code assignment depends on local customs practices and import/export de minimis thresholds. For typical aromatic sulfonic acids, importers and manufacturers reference HS code series in the 2904 or 2921 range as a starting point. Correct classification must match the product’s declared application (e.g., dye intermediate, fine chemical) and any country-specific subheading. Batch documentation routinely cross-checks the latest customs bulletins, with final HS coding subject to local regulatory interpretation and shipment particulars. |
Production of 2-amino-4-chloro-5-methylbenzenesulfonic acid in the manufacturing context involves aromatic substitution chemistry. Raw material choices and process route selection reflect end-use specifications, especially the requirements of azo dye, pigment synthesis, or specialty chemical markets. Source anilines must align for purity and positional substitution. Major control points include sulfonation temperature and chlorination sequence to regulate positional isomer formation and minimize undesired side-products.
In-process identification employs both structural assignment and batch tracking. Where the finished product grade targets dye intermediate use, higher scrutiny falls on impurity profile—chiefly positional isomers and incompletely reacted intermediates. Standard in-house assays adjust for batch-specific response, with high-performance liquid chromatography and titrimetric analysis used to confirm sulfonic acid content and residual chlorinated anilines.
Application-sensitive requirements influence physical property confirmation, such as bulk density or solubility in downstream solvents. Many properties, including melting point and water solubility, reflect not just the nominal structure but the total impurity burden—thus, formal release of each batch always relates to internal specification, customer-contracted values, and the intended application.
Customs classification presents distinct challenges for aromatic sulfonic acids with potential dual-use or precursor status. Regional discrepancies in customs interpretation mean every export documentation set requires a cross-check against current national requirements, with preferred code assignments often updated after periodic regulatory review. Final compliance and shipment depend on up-to-date regulatory tracking, not simply default database lookups.
Production batches of 2-Amino-4-Chloro-5-Methylbenzenesulfonic Acid are generally observed as a crystalline powder or granular solid; color typically ranges from off-white to pale yellow. The precise appearance depends on the grade, which may vary according to end-use (e.g., dyestuff intermediates vs. specialty applications) and purification steps. Odor is negligible under standard processing conditions. Melting points can vary with residual solvent content and impurity levels; detailed melting range is characterized for each batch as part of the release procedure. Boiling and flash points are rarely determined due to the compound’s thermal stability profile, with decomposition occurring before boiling. Bulk density can shift based on granule size, compaction, and drying method; specific values are generally aligned with internal form requirements and customer processing needs.
Stability in storage and application is higher under controlled temperature and humidity. Exposure to strong oxidizers, bases, or prolonged sunlight can cause degradation or color changes. Reactivity toward standard acid, base, or oxidative conditions should be evaluated in the process development phase according to the end-use requirements.
Solubility in water and common solvents (e.g., ethanol, methanol) relates to form and purity. Solution preparation requires complete dissolution, with pH adjustment if needed for formulation or testing. Grade-dependent solubility impacts downstream process integration, for example, in dye syntheses or analytical use.
| Parameter | Industrial Grade | Refined Grade |
|---|---|---|
| Appearance | Pale yellow powder | White to light yellow crystalline |
| Assay (by titration or HPLC) | Typical values defined by process capability | Higher purity for applications needing low impurity background |
| Moisture content | According to drying step and application | Controlled to tighter limits for sensitive formulations |
| Inorganic impurities | Dependent on raw material quality | Minimized through process and post-treatment |
| Color index | Process route affected | Critical for color-sensitive downstream use |
Major impurities include unreacted starting materials and sulfonation by-products. Intermediate and high-purity grades differ mainly by post-synthesis purification and by batch-to-batch consistency measures. Acceptable impurity limits are defined both by customer specification and internal historical process data, refined based on actual in-use performance feedback.
Testing employs titration, HPLC, Karl Fischer (moisture), UV-Vis (color/clarity), and, where needed, ICP for trace metals. Standards and methods follow customer contractual agreements or reference national/industry test norms; internal validation ensures fitness for purpose.
Key raw materials include toluene derivatives with defined isomer ratios. Procurement targets both supplier reliability and analytic purity, as upstream contaminant profile influences downstream impurity formation. Process water and acid grade are matched with process risk requirements to manage corrosion and side-reaction potential.
Manufacturing routes typically employ sulfonation of substituted toluene compounds, sequential amination and chlorination under defined temperature and agitation. Route selection balances yield, impurity minimization, and effluent treatment simplicity, with solvent and acid recycle designed for both cost and environmental criteria.
Batch and continuous approaches are both used, based on plant size; monitoring critical parameters (temperature, pH, reactant dosing) remains priority for lot reproducibility. Final purification may use filtration, centrifugation, or solvent recrystallization, adjusted per target grade. Analytical fingerprinting of each lot enables early detection of deviation.
Lab release incorporates appearance, assay, moisture, by-product tracking, and solubility. Additional modules (e.g., color comparator, particle size) are enacted for specific contracts. Any batch falling outside of reprocessing criteria undergoes full deviation review before release.
Primary industrial uses focus on azo coupling and further aromatic substitution. Reaction suitability depends on both substituent orientation and sulfonic acid group stability, which can impact reactivity and selectivity in multi-step syntheses.
Conditions include aqueous or mixed solvent systems with acid or base catalysis. Temperature regimes are typically held below decomposition thresholds; solvent/selectivity optimization remains application-driven and adjusted for scale-up.
Modification chemistry leads mainly to azo dyes, pigments, and specialty intermediates for advanced polymer or resin applications. The availability of both amino and sulfonic functional groups provides reasonably broad reactivity for further transformation.
Warehouse practice maintains product under cool, dry conditions out of direct light. Moisture and airborne contamination risk rises with open storage; closed, compatible containers are selected to minimize water ingress, oxidation, and cross-contamination.
Acid-resistant materials, typically high-density polyethylene or lined fiber drums, are selected based on handling risk and transit distance. Metal contamination is avoided to prevent discoloration and catalytic degradation during storage.
Continuous monitoring tracks color change, moisture gain, or loss of flowability as early shelf-life indicators. Shelf life remains defined by ongoing stability data and application testing feedback.
Hazard coding depends on definitive toxicity, skin/eye irritation, and aquatic impact data. Manufacturer handling and labeling align with results from current batch testing and regulatory adaptations for relevant markets.
Hazard statements focus mainly on potential for skin, eye, and respiratory irritation. Dust generation during handling adds inhalation risk; best practice includes local exhaust, dust masks, and eye protection in production and packaging zones.
Acute and chronic toxicity values reflect both published literature and in-house animal and in vitro studies, adjusted for impurity and by-product profiles associated with particular synthesis routes.
Exposure controls in the plant operate according to internal hygiene monitoring results and continual review of published toxicology. Controls may include enforced PPE, regulated access, and regular staff training. Handling protocols undergo yearly review aligned with incident reports and external regulatory updates.
Production volumes for 2-Amino-4-Chloro-5-Methylbenzenesulfonic Acid are established based on annual output and direct plant scheduling, subject to the grade and downstream integration with dyes and intermediates. Plants designed for sulfonation and nitration chemistry manage multipurpose reaction trains, so the available tonnage can fluctuate based on internal demand, campaign scheduling, and market pull from adjacent product lines. Allocation to export markets tends to be finalized each quarter after accounting for domestic customers and the needs of strategic partners. Continuous process improvements and investment in waste treatment ensure consistent plant uptime, but seasonal and infrastructure-related bottlenecks can affect available lots for spot purchase.
Lead times reflect inventory management practices with batch production cycles ranging from a few weeks to several months, depending on campaign size, grade, and purification route. Minimum order quantities are dictated by logistical efficiency and technical requirements; fine grades requiring custom purification or high traceability carry higher MOQs to justify dedicated processing and analytical overhead.
Standard packaging employs sealed fiber drums or HDPE containers lined with inner polybags, selected to mitigate hygroscopicity, facilitate batch traceability, and comply with transport regulations for aromatic sulfonic acids. Tailored packaging is available for high-purity and export grades when justified by customer application (e.g., pharmaceuticals, electronics).
Bulk and containerized shipments follow INCOTERMS negotiated per transaction. Export shipments favor 20-foot containers with consolidated batch traceability, covered by insurance against chemical-sensitive cargo events. Payment terms are set according to buyer profile, new-customer risk assessment, and region-specific compliance checks.
Upstream input costs revolve around toluene derivatives, chlorination reagents, sulfonating agents, and reduction catalysts. Fluctuations in crude oil, benzene, and chlorinated aromatics feed directly into the monthly cost baseline. Energy and steam cost volatility carries through to the final batch economics, given the heat- and mass-transfer intensiveness of the primary steps.
Intermittent disruptions in the supply chain for toluene, chlorobenzene, and sulfur trioxide create significant cost variability. Regional environmental crackdowns or unexpected outages at chlorination or sulfonation plants have cascading effects on availability and lot prices.
Batch price is set according to purity level, the stringency of impurity profiling, and conformance to specific regulatory dossiers. Pharmaceutical or electronic application requires tighter batch-to-batch control, lower allowable by-products (such as ortho- and meta-isomers and heavy metals), proven through systematic documentation and supported by third-party certification, which introduces an added cost compared to standard dye/intermediate grades. Packaging with UN certification and tamper-evident features also affects end-use market pricing.
Demand peaks in regions with strong textile, pigment, and pharmaceutical industries. China and India serve as core supply origins due to integrated aromatic raw material bases and high-capacity sulfonation/amination assets. Downstream integration with local users moderates real external availability, especially for specialties and high-purity segments. US and EU markets place higher emphasis on supply chain transparency, impurity profiling, and documented regulatory adherence, often resulting in premium pricing for validated supply.
| Region | Market Characteristics |
|---|---|
| US | High compliance threshold for toxicological data and transport; main demand from specialty chemical and custom synthesis sectors. |
| EU | Strict enforcement of REACH and downstream monitoring of sulfonic acid intermediates in eco-sensitive applications. |
| JP | Procurement focused on traceability, impurity mapping, and certification for electronics and advanced intermediates. |
| IN | Strong local demand for dye intermediates and cost-competitive sourcing for regional integration projects. |
| CN | Largest production base; ability to absorb feedstock cost spikes through integrated raw material supply and flexible batch scheduling. |
Continued tightening of environmental controls in Asia and ongoing volatility in aromatic raw materials are expected to support a steady upward trend in cost base into 2026. Premiums for high-purity, low-impurity, or REACH-registered grades will widen further due to increased audit and documentation costs. Suppliers maintaining robust in-process control and traceable supply chains are positioned to meet stricter global buyer criteria and defend price premiums.
Trends and analysis reflect historical industry transaction data, in-house procurement tracking, REACH/Japan CSCL-registered shipments, and downstream demand indicators from textile and pharmaceutical manufacturer consortia.
Ongoing expansion and modernization initiatives in major chemical parks are increasing installed capacity but remain balanced by stricter local discharge and emissions quotas. Shifts by downstream users toward certified and low-contaminant grades are driving refinement in process controls and analytical profiling.
Authorities in major economies updated discharge limits and compliance oversight on intermediate sulfonation plants. REACH and US TSCA updates have raised documentation and analytical proof requirements for imported lots. Facilities supplying the EU and advanced US sectors have invested in expanded QC laboratories and electronic batch traceability.
Supplier R&D and production teams continue to optimize purification and batch verification, with emphasis on minimizing chlorinated and sulfonated by-products. Expanded collaboration with accredited logistics and customs agencies is underway to further streamline documentation and compliance for cross-border supply.
2-Amino-4-Chloro-5-Methylbenzenesulfonic Acid serves as an intermediate in dye manufacturing, pigment synthesis, and certain pharmaceutical processes. Most volumes move into azo and reactive dye production, where the aminosulfonic structure enables coupling reactions or functional group modification. The compound has limited use in direct food contact or personal care, given regulatory thresholds for aromatic amines in those sectors.
Manufacturing sectors look for consistency in molecular profile and avoided by-product formation, which impacts yield and downstream color tone or reactivity. Each segment often stipulates purity, insoluble content, and color index strength according to end-use—making the defined technical grade pivotal.
| Industry Segment | Grade Reference | Key Quality Parameters |
|---|---|---|
| Dyestuff Manufacturing (Azo, Reactive, Acid Dyes) | Industrial Technical | High assay by titrimetry or HPLC, controlled insoluble content; batch-to-batch color shade tracking; sodium, iron, and other trace metals within sector norms |
| Pigment Synthesis | Technical / Custom | Profile of isomeric purity; controlled residual solvents; volatile matter; specific requests on meta/para isomers |
| API Intermediates | Selectable High-Purity | Enhanced control of residual organics, halide content, and documented traceability of each raw material lot |
For dye production, purity standards focus on minimizing unknown coloration bodies and maintaining strict moisture limits. Impurities that shift dye color, such as alternate amines or sulfonic acid isomers, demand targeted in-process controls. Pigment production can accept broader ranges on some by-products if these do not migrate into insoluble residues that affect filterability.
Pharmaceutical segments define higher demands for both elemental impurity data and full residual solvent profiling. The process route—whether sulfonation or amination last—determines inherent impurity risk. Quality control teams perform method validation against sector standards and customer protocols.
Establish the end-use: dye synthesis, pigment compounding, or downstream API intermediate. Each field sets different expectations for by-product tolerances and documentation levels. The technical or high-purity grade must fit the target sector’s outlined needs—not all industries permit substitution between them.
Industry, region, and customer standards determine if detailed trace metal, aromatic amine, or halide screening is mandatory. For exports, customer audits may raise threshold questions on banned substance declarations, batch release documentation, or REACH/TSCA conformity. Grades matching food/pharmaceutical sectors will require both GMP-aligned traceability and third-party audit readiness.
Assess how much impact trace impurities may have on the process outcome. Dye makers prioritize tone consistency and reactivity, so batch color index and purity cutoffs matter. For pigment or pharmaceutical applications, impurity origin, test frequency, and contaminant pathway must shape grade selection. Lot consistency is managed by release QC, verified by multi-technique analysis.
Large-volume productions typically prefer standard technical grade, which balances impurity control and cost. Custom synthesis and smaller API runs need tailored high-purity batches, which bring increased cost due to staged purification, isolation, and testing. Minimum order volumes, packaging needs, and delivery lead times may vary by grade and application.
Process labs should validate grade suitability by requesting representative samples, then running trial reactions or product formulations. QC checks at this stage confirm compatibility with downstream processing and help document any grade-specific variance for future scale-up.
As a manufacturer with multi-year production experience for 2-Amino-4-Chloro-5-Methylbenzenesulfonic Acid, only internationally recognized quality system certifications support actual batch traceability. Our operating plants maintain current ISO 9001 certification, covering raw material sourcing, reaction control, in-process testing, and final release inspection. Recertification audits are performed on schedule, so every production campaign is backed by a verified quality system.
Depending on customer or regulatory demand, we can support qualification audits and provide product documentation for compliance with region-specific requirements. For applications requiring food-contact, eco-label, or pharmaceutical precursor status, documentation must align with the application and batch traceability chain. Detailed certifications, such as Kosher or Halal, are available only for dedicated campaign lines after pre-approval and audit.
Standard product shipments include certificates of analysis, release documentation, and lot-specific analytical reports that reflect in-process control and batch-specific quality values. Request-driven documentation, such as change control, audit protocols, or analytical method validation reports, is coordinated via technical and quality teams. Where sensitive information is linked to proprietary production, disclosure follows strict confidentiality protocols and NDAs.
Long-term output stability for 2-Amino-4-Chloro-5-Methylbenzenesulfonic Acid depends on consistent raw material policy and critical equipment redundancy. Allocation between annual contract supply and spot orders requires early coordination, especially for grades with differentiated impurity or moisture content requirements. Offtake planning is discussed openly at order placement, minimizing lead times for fluctuations in demand. For new customers, sample evaluation and limited initial release precede scaled allocation, ensuring supply chains remain balanced.
Process intensification and parallel line design afford stable capacity for core grades. Feedstock sourcing always considers volatility, with approved secondary vendors qualifying before load-in. In case of demand or upstream disruption, core grades are prioritized for contracted buyers as per supply agreement terms. Alternate route capacity can be mobilized to manage specialty grade requirements. Modifications in process route—chlorination, sulfonation or amination step—are communicated as technical change notices when required by product grade or customer audit.
Sample requests for 2-Amino-4-Chloro-5-Methylbenzenesulfonic Acid undergo qualification through the technical support team. Typical sample quantities and documentation are defined by downstream trial or pre-registration needs. All samples ship with full analytical reporting and material safety data. Additional test methods, impurity profiles, or custom packing are discussed ahead of dispatch and subject to customer’s technical requirements. Evaluation feedback is integrated into main production planning, leading to optimized scale-up or commercial supply adjustments.
Procurement flexibility relies on mutual transparency in forecasting, manufacturing availability, and logistics execution. Annual fixed-volume contracts guarantee base supply, with built-in clauses for volume fluctuation and rolling order adjustment. Spot supply and make-to-order arrangements provide options for non-standard impurity or color targets, following pre-set tolerances defined at contract negotiation. Custom logistics, packing, and documentation arrangements are supported for regional regulatory compliance or import handling requirements. Joint R&D or co-development on special applications follows staged technical agreement and process confidentiality.
In current industrial practice, the focus tends to concentrate on refining sulfonation and chlorination processes to improve both product purity and yield. Manufacturers studying this chemical often invest in process analytical technology to monitor reaction endpoints and manage heat loads during sulfonation. Research groups investigate new purification setups to minimize residual inorganic salts and cost-intensive byproducts, which can present trouble in downstream dye and pigment formulations. In plant operations, typical control points revolve around managing stoichiometry in the amination and methylation reactions, as well as clear separation of isomeric byproducts specific to the starting aromatic substrate chosen.
The main market remains coloration intermediates, but, in recent years, formulators in paper and textile chemicals examine how this compound behaves as a solubility modifier for newer dye precursors with stricter emission controls. Demand for higher-purity, low-ferrous grades has risen due to more sensitive catalytic systems in certain specialty pigment syntheses. Researchers in water treatment observe that derivatives might aid in custom resin production, though qualification cycles depend on sulfonic acid purity and amine integrity defined by application.
Batch scale-up tends to expose issues with particle size control and trace haloaromatic contamination, particularly impacting the color profile in end-use cases. Purification often generates significant aqueous effluent; as a result, waste minimization through closed-loop crystallization stands out as an area of technical improvement. Some manufacturers have documented success through staged neutralization-crystallization protocols, reducing sodium chloride carryover. Ongoing efforts confront the challenge of selective recovery of mother liquors—especially for higher-value, pharma-grade intermediates.
Demand projects stable-to-growing, in line with global dye and pigment sector development, though local capacity expansions in Asia could alter regional balance. Technical users in specialty colorants and functionalized resins indicate a gradual shift toward higher specification grades for both purity and particle handling, with formal specification differentiation increasingly used in competitive bids. Some market consolidation among large-volume buyers encourages multi-year supply contracts, influencing batch production scheduling and inventory planning.
Process automation and in-line monitoring see wider adoption, especially for continuous processes seeking to reduce manual adjustment of reaction conditions. Manufacturers with pilot lines have started adopting concentrated acid handling systems with advanced vapor containment to reduce fugitive emissions. Evolution toward process intensification—reducing reaction duration and solvent load—is ongoing, subject to final grade definitions. Selective crystallization methods will likely become more relevant where impurity profiles dominate release criteria, especially for downstream applications that demand tight metal and halide controls.
Raw material selection increasingly weighs local sourcing of chloroaromatic feedstocks, as transport impacts both carbon footprint and batch-to-batch trace impurity variance. Technology improvements focus on reducing aqueous effluent by maximizing recovery, recycling wash streams with in-line conductivity-based endpoint detection, and using lower-impact neutralizing agents. Implementation of solvent recovery, especially for methylation routes, reduces volatile organic emissions. Region-specific regulation of sulfonic acid byproducts informs both process and post-processing strategy—especially as more brands require green chemistry documentation tied to product specification sheets.
Process teams and application specialists provide advice tailored to formulation requirements—whether the compound is intended for disperse dye, direct dye, or resin intermediate use. Suggestions are based not only on base product grade but also on how specific impurity limits, water content, or sulfate residual affect susceptibilities in downstream blends. Advice extends to bulk handling procedures, optimal pH for dissolution, and preferred modes for inline micronization when customer receives solid form.
Support includes optimization for customer-specific processes, such as advice on particle size range for dry blending or recommendations for slurry concentration during pre-mix. Support staff routinely engage in root cause analysis for filtration or solubility inconsistencies, referencing historical in-process quality control data. Application support can also address conditioning or stabilization needs for extended storage or atypical transport environments, with suggestions based on both grade and application context.
Commitment includes monitoring batch history and traceability of raw material inputs for each production lot, allowing response to any customer-identified deviation or request for COA retesting. Feedback mechanisms route inquiries to both technical and quality control units, which maintain documentation tied to both release and customer-generated specifications. Batch-to-batch consistency receives ongoing evaluation, supported by pre-shipment and retention sample analysis under representative storage conditions, and followed by engagement for corrective action where any deviation is confirmed.
Specializing in the direct synthesis of 2-amino-4-chloro-5-methylbenzenesulfonic acid, our production plant brings over a decade of hands-on chemical engineering to large-volume supplies. Every batch starts with controlled raw material handling, high-efficiency sulfonation reactors, and continuous in-process monitoring. This approach sets consistent product performance as the baseline for every drum we deliver.
This sulfonic acid compound finds regular use in the manufacture of azo and reactive dyes, textile colorants, and related intermediates. Its role as a building block in color chemistry enables large dye houses and pigment manufacturers to develop custom shades, improve wash fastness, and streamline formulation processes. Demand in agrochemical processing and pharmaceutical synthesis also remains constant, thanks to its reliable chemical behavior in multi-stage syntheses.
Laboratory analysis teams at our site run HPLC, GC, and titrimetric tests on every production lot. Specification adherence covers purity, moisture content, color, solubility, and content of trace impurities. Retained samples from each batch allow partners to access records for regulatory audits or technical review. This system aims for stable supply chains, not just internal compliance. Documentation on test results can be produced on request to support downstream quality checks and regulatory filings required by industrial operations.
Product leaves our factory in sealed HDPE drums or custom stainless bulk containers, depending on buyer preference. Standard packaging holds from 25 kg up to 500 kg net weight per drum, suitable for both manual and mechanized handling systems. Teams on-site oversee palletization, labeling according to international standards, and moisture barrier protection. Integrated logistics contracts support timely bulk shipments by sea, rail, and domestic truck routes. Tracking allows all parties real-time visibility during transit.
Our technical team regularly partners with process engineers and plant managers to troubleshoot practical challenges—dissolution kinetics, integration into continuous dyeing or batch reactor setups, or handling safety improvements. Ongoing support covers regulatory compliance, adaptation to local process variables, and optimization of chemical dosage in production lines. Case studies from textile and dye intermediate plants using our sulfonic acid as part of scale-up and process validation routines offer practical reference points.
Plant managers, procurement teams, and formulation chemists gain predictable access to a single-source product backed by cradle-to-gate traceability. Producers relying on smooth upstream chemical flows minimize risk of off-spec supply, delivery uncertainty, or compatibility gaps. Distribution partners serve their customers more efficiently due to the reliability and flexible shipment sizes. This supply model helps manufacturers stick to production schedules, meet industry standards, and avoid hidden costs from inconsistent raw material quality.
| Aspect | Description |
|---|---|
| Synthesis | Direct plant-scale chemical synthesis, not outsourced |
| Quality Control | Batch-specific analyses using HPLC, GC, and titration |
| Packaging | Drums and IBCs with transport-proven sealing |
| Supply Chain | Industrial volumes, flexible loadings, tracked delivery |
| Technical Support | Integration advice, regulatory documentation, process troubleshooting |
From many years of producing 2-Amino-4-Chloro-5-Methylbenzenesulfonic Acid on an industrial scale, the challenge has always centered on consistency and impurity control. Every batch brings its own set of minor hurdles. The reality is that this compound, essential for dye and pigment synthesis, arrives with a predictable family of impurities that stem from raw materials and core reactions.
Chlorinated toluene derivatives, unreacted starting amines, and traces of inorganic salts remain the primary residuals post-synthesis. We see ortho or para substituted analogs (isomers that form from incomplete regioselectivity), minor levels of desulfonated material, and sometimes sulfonation byproducts. Another impurity we monitor closely is moisture, as high water content disrupts downstream processing and increases handling risks in automated plants.
Our technical team sets strict working limits because downstream processes, whether dye couplings or pigment intermediates, demand predictable reactivity. Purity for our commercial and technical grade 2-Amino-4-Chloro-5-Methylbenzenesulfonic Acid generally runs above 98% by HPLC assay. Many applications can accept assay values in the 96%-98% range; specialty applications often specify above 99% for tighter control during synthesis.
We monitor individual organic impurity levels by GC and HPLC, keeping each one below 0.5% and targeting a total impurity ceiling of 1.5% for technical grade. For residual inorganic salts, gravimetric and ion chromatography assays confirm sodium and chloride as trace contributors, rarely exceeding 0.1%. Moisture content receives particular attention in our packaging plant, and we ship standard material with water content below 0.5%, as measured by Karl Fischer titration.
Every impurity—however minor—raises costs somewhere along the value chain. Undesired isomers or desulfonated byproducts can create side reactions or reduce product yield. When pigment chemists scale up a new recipe, these small contaminants often mean more solvent usage, extra washing steps, or lower final brightness. We're direct about these issues because any deviation impacts real-world performance or economics.
The role of trace inorganic salts can't be ignored, either. When formulating aqueous dispersions or running high-shear reactors, sodium and chloride residues, for example, sometimes accelerate corrosion or disrupt catalyst lifespans. Many customers have approached us seeking lower residuals for continuous flow setups, and our team responds by integrating additional washing and filtration into contract production runs.
Continual investment in analytical capability makes a difference. We introduced in-line process HPLC so our chemists can detect process drift before it shows up in the finished drum. Dedicated batch documentation, from sulfonation through final drying, ensures traceability.
Transparency matters. Customers often request a copy of the latest COA or site visit to our plant. We accommodate this because technology-savvy buyers want proof, not promises. If tighter impurity profiles or specialized packaging are required, our process engineers will adjust. Open dialogue with users allowing us to spot bottlenecks or sources of variability, which feed back into our process improvements.
Manufacturing quality 2-Amino-4-Chloro-5-Methylbenzenesulfonic Acid is never just about hitting a number on a certificate. It's about ensuring raw material performance as reliably as possible, eliminating guesswork and hidden costs in complex, high-value supply chains. We take that responsibility seriously.
Every production run on our lines starts with careful planning. We set our minimum order quantity (MOQ) by considering process efficiency, quality assurance, and the resources needed for safe, consistent output. If we run below a certain scale, we waste materials, add excessive downtime for cleaning or setup, and lose the traceability we need for compliance. Put simply, running batches too small for our system introduces risk rather than saving money. Our MOQ reflects years of process optimization, where we balance customer needs with operational discipline.
Larger customers know that pushing for ever-smaller lot sizes leads to more changeovers, longer lines, more labor, and greater potential for contamination. We maintain our MOQ to minimize these exposures and guarantee on-spec product every batch. If a project has special requirements, such as pilot runs for R&D or process trials, our technical team remains open to discussion, but the MOQ acts as a baseline for consistency and cost control.
We do not treat packaging as an afterthought. Every package size we offer comes with its own investment in testing, validation, and logistics planning. Standard options often range from small-volume drums for specialty applications up to bulk containers suitable for high-volume users. At the core, our available packaging reflects customer demand, equipment limitations, and strict adherence to chemical safety standards. Before putting a new container size on our list, we examine stacking strength, liner compatibility, chemical interaction risk, and transport regulations.
Part of our job as a manufacturer includes keeping tabs on packaging regulations. We must ensure all packaging materials are fully compatible with the chemical formulation. Some products need UV-blocking or anti-static liners, others call for corrosion-resistant closures. These factors drive how we choose and label our standard sizes. In regions where handling regulations differ, we support customers with suitable documentation and technical details.
Minimum order quantity and packaged size affect more than just invoice totals. These factors underpin quality, supply chain efficiency, and our ability to guarantee reliable delivery. A lower MOQ might seem appealing, but scaling too small disrupts scheduling, drives up per-unit costs, and makes it harder to meet foreign export rules. We continue to adjust and revisit our MOQs based on historical orders, raw material sourcing shifts, and changes to our own upstream inventory levels.
For industries depending on consistent chemistry and traceable batches, both MOQ and packaging selection become part of the risk management plan. Our team always works directly with end-users to select packaging that fits storage, dispensing, and process needs—there is little value in a package too large to handle safely, or too small to justify shipping and logistical overhead.
Our MOQ and packaging sizes are not arbitrary. As a direct manufacturer, we set them with the full picture of safety, efficiency, and market demand in mind. We always welcome deeper technical discussions, and where possible, support custom solutions if they align with safe, sustainable production. Our commitment to straightforward, transparent communication in these matters keeps projects running on schedule and helps our customers plan with confidence.
Years of chemical production have shown us that compliance with European regulations is never an afterthought—it’s front and center in each batch we produce. Our team studies the evolving landscape of REACH (Registration, Evaluation, Authorisation, and Restriction of Chemicals) requirements, so our customers gain peace of mind with every shipment. For products exported to the European Union, we carry out pre-registration, registration, or notification obligations as demanded by REACH. If our exports meet volume thresholds, we appoint Only Representatives within the EU to manage the necessary paperwork and audits associated with compliance. Our raw material sourcing always references the approved supply chain, and we keep full traceability records, from inbound shipments through production to delivery at your destination.
REACH affects everything in our production process, from sourcing and safety data stewardship, to packaging design and labeling. Our regulatory affairs specialists maintain an up-to-date list of all relevant CAS numbers and regulatory status, ensuring exclusions, downstream use restrictions, and substance concentrations fall inside legal limits. We keep all safety data sheets and exposure scenarios current so customers receive the most recent regulatory information upon each order.
Shipping chemicals internationally means more than just preparing drums and containers. Each shipment comes with a core package of export documentation, including Material Safety Data Sheets, Certificates of Analysis, certificates of origin, and, where necessary, REACH compliance declarations. Our documentation division works directly alongside production and logistics, so paperwork matches product batches and real-time stock—no copy-paste errors, no gaps.
Customs authorities scrutinize each document, especially when shipping to the EU, Middle East, or Asia-Pacific. Our commercial invoices, packing lists, and transport documents satisfy these regulations in full detail. For dangerous goods, our transport teams prepare the IMDG, IATA, or ADR documents alongside the shipment, ensuring no delay at ports and border crossings. Some destinations require consular legalization or notarization. Our factory partners with licensed notaries and local chambers of commerce to ensure these documents bear the proper authorizations.
On the production side, we regularly train our plant workforce and regulatory staff to keep up with shifting requirements—not just from the EU, but wherever our materials travel. Changes to REACH, regional inventory requirements (like TSCA or K-REACH), or the addition of new substances to the Candidate List immediately prompt a recheck of our current registrations and documentation practices.
We also encourage our customers to share information on the intended use and downstream handling scenarios for our chemical products. By integrating this data into our safety and regulatory evaluations, we help clients avoid compliance interruption. Packaging lines automatically generate batch-specific documentation, and our logistics software matches every sales order to its corresponding compliance file.
Our commitment to regulatory accuracy benefits all parties along the supply chain. Up-to-date certificates, transparent compliance status, and prompt document fulfillment support the movement of shipments through customs and regulatory inspections. We see our responsibility as much broader than supply—it’s about ensuring uninterrupted, risk-mitigated access to industrial materials wherever your manufacturing needs arise. By investing in compliance infrastructure and a hands-on approach to export documentation, we remove obstacles before they appear—helping customers avoid costly border delays and regulatory penalties. This perspective comes not from a distant desk, but from the heart of daily factory operations where compliance translates into real-world assurance, both for us and for the industries we serve.
For product inquiries, sample requests, quotations or after-sales support, please feel free to contact me directly via sales3@ascent-chem.com, +8615365186327 or WhatsApp: +8615365186327
