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HS Code |
738538 |
| Synonyms | Tobias acid; 5-Sulfo-o-toluidine |
| Molecular Formula | C7H9NO3S |
| Molar Mass | 187.22 g/mol |
| Cas Number | 88-44-8 |
| Appearance | White to off-white crystalline powder |
| Melting Point | 160-164°C |
| Solubility In Water | Soluble |
| Boiling Point | Decomposes before boiling |
| Density | 1.44 g/cm³ |
| Pka | Approximately 1.3 (sulfonic acid group) |
| Structural Formula | C6H3(CH3)(NH2)(SO3H) |
| Odor | Odorless |
| Ec Number | 201-832-8 |
As an accredited 2-Aminotoluene-5-Sulfonic Acid factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Sealed in a 500g amber plastic bottle with screw cap, labeled with chemical name, hazard warnings, and handling instructions. |
| Shipping | 2-Aminotoluene-5-Sulfonic Acid is shipped in tightly sealed containers to prevent moisture absorption and contamination. Store and transport in a cool, dry place, away from incompatible substances. Follow all applicable regulations for handling chemicals, labeling, and documentation. Appropriate hazard labeling and documentation must accompany every shipment to ensure safe and compliant delivery. |
| Storage | 2-Aminotoluene-5-sulfonic acid should be stored in a cool, dry, and well-ventilated area, away from incompatible substances such as strong oxidizers. Keep the container tightly closed and protected from moisture and direct sunlight. The storage area should have appropriate containment to prevent environmental release and must comply with chemical safety regulations. Use corrosion-resistant shelving for prolonged storage. |
Applications of 2-Aminotoluene-5-Sulfonic Acid in Industrial Manufacturing2-Aminotoluene-5-sulfonic acid serves as a critical intermediate in the synthesis of dyes, pigments, and specialty chemicals. The following sections outline specific industrial scenarios where this compound is integrated, highlighting application requirements, formulation ranges, production methods, and the types of end products achieved by downstream partners. 1. Azo Dye Synthesis for Textile ProcessingManufacturers in the textile coloration sector rely on 2-aminotoluene-5-sulfonic acid as a diazo component for producing direct and acid azo dyes. Its sulfonic acid group enhances water solubility and binds efficiently with textile fibers, while the amine moiety enables precise coupling in the chromophore assembly. This use focuses on delivering consistent shade reproducibility and fastness properties required for modern dyehouses producing cotton, viscose, and blended fabrics. Industry compliance standards
Typical usage ratio
Downstream process integration
Final product types
2. Pigment Manufacture for Printing InksThe compound is essential for the synthesis of organic pigments used in inkjet and flexographic printing. Its molecular structure confers stability to pigment molecules, leading to better dispersibility in polar ink vehicles and helping guarantee batch-to-batch color uniformity demanded by print and packaging industries. End users expect high pigment purity to meet regulatory limits in consumer-facing applications. Industry compliance standards
Typical usage ratio
Downstream process integration
Final product types
3. Intermediate for Reactive Dyes in Cellulosic FibersDownstream dye manufacturers utilize this material as a key building block for synthesizing monoazo reactive dyes tailored for cellulosic substrates such as cotton and viscose. The presence of both amino and sulfonic functionalities supports high fixation rates and wash fastness, helping achieve the high reproducibility required in large-scale garment manufacturing for global markets. Industry compliance standards
Typical usage ratio
Downstream process integration
Final product types
4. Component in Sulfonated Aromatic Intermediates for Agrochemical SynthesisCrop protection chemistry companies employ 2-aminotoluene-5-sulfonic acid as an intermediate for preparing advanced sulfonated aromatic compounds. These intermediates act as precursors in the synthesis of certain selective herbicides. Industry clients demand strict control of sulfonate purity and trace amine content to maintain batch consistency and meet residue limits in finished agrochemicals. Industry compliance standards
Typical usage ratio
Downstream process integration
Final product types
5. Synthesis Intermediate in Specialty Chemical AdditivesManufacturers of process aids and functional additives use this compound for introducing both amino and sulfonic acid functionalities into custom molecules for application in water treatment, paper sizing, and specialty surfactants. These applications require tailored molecular architectures where the starting raw material’s purity and reactivity parameters dictate final additive performance across various engineering operations. Industry compliance standards
Typical usage ratio
Downstream process integration
Final product types
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In this industry, practical experience with 2-Aminotoluene-5-Sulfonic Acid reveals how foundational chemistry and steady manufacturing skill transform simple raw materials into the building blocks for reliable dye production. Each lot we prepare reflects years of formula refinement, hands-on process adjustments, and attention to batch consistency, all shaped by actual production demands. While the name sounds academic, this compound plays a clear role for any manufacturer who needs high-purity sulfonic acids that handle challenging conditions in dye synthesis. We understand its strengths from years running reactors here, and that’s what shapes our perspective on its value—not just as a chemical, but as a tool that solves real problems for colorant producers.
Over the years, our production lines have seen a broad range of requests. 2-Aminotoluene-5-Sulfonic Acid stands out for its versatility, but even more for its reliability in azo dye manufacture and similar processes that demand consistent performance. Unlike some of its close isomers or alternatives, the structure of this compound consistently gives clear color development without introducing unwanted side-reactions or instability under the temperatures and pH levels dye synthesis throws at it. The ortho–para substitution on the aromatic ring creates differences in both solubility and reactivity, which directly show up in our day-to-day output yields and stability testing.
Our plant doesn't just push out an item by rote from a recipe. Each batch starts with precise weighing of raw materials, control of reaction temperature, and careful watch over sulfonation and amination steps. Year after year, experience tells us that even minor tweaks in time, pressure, or purification steps lead to noticeable differences in color depth and yield when our customers put the material to use. In the past, inconsistent purification brought headaches—sulfonic acid impurities caused fading or poor reproducibility for downstream users. We learned that extra filtration and steady monitoring of crystallization pays off, not by chance, but from direct observation and feedback from the dyehouses themselves.
The physical form—usually a pale, solid crystalline powder—comes straight from the reaction workup. True to form, storage stability hinges on residual moisture content and the absence of by-products. Every batch passes hands-on tests for color value, solubility in water, and melting point to catch drift in quality early on. This kind of hands-on involvement means fewer surprises for those blending pigments or preparing intermediates, which matters more than any certificate alone can show.
From a manufacturer’s view, the specifications are not paperwork—they frame our process controls at every step. Our batches of 2-Aminotoluene-5-Sulfonic Acid typically meet a purity above 98.5% by titration, with iron not exceeding 30 ppm and maximum ash content below 0.2%. Moisture gets checked with direct heating; if it creeps above 1%, it hampers both shelf life and reactivity under dye conditions, so we respond fast. Particle size comes into play for some users, especially in high-speed blending operations. For most, a slightly granular powder flows better than the ultra-fine, which tends to cake and slows production lines. These details come from open conversations and troubleshooting with users—not just from a standardized datasheet.
Safety is part of every discussion because exposure to aromatic sulfonates carries risks if not managed well. We don’t just read warnings off a sheet; every worker wears protection, monitors ventilation, and keeps clear procedures ready for spills or dust. Our plant never tolerates shortcuts with containment or disposal. This hands-on awareness comes from time on the plant floor, not just in the office.
Dye manufacturers shape much of our daily routine. Most demand 2-Aminotoluene-5-Sulfonic Acid for benzidines, azo pigments, food colors, and direct dyes. In our experience, small quality shifts in this material cause surprising effects on chromaticity and shade stability. Past years taught us that replacing this compound with a different aminotoluene or switching sulfonation position triggers not just regulatory issues, but actual differences in transparency, lightfastness, and salt resistance. Every operator in the plant has seen how a stable batch leads to trouble-free dye development and happy reports from end-users.
In the lab, our process chemists have compared isomers and related acids. 2-Aminotoluene-4-Sulfonic Acid, for instance, sometimes gives slightly different dispersion or solubility, enough to matter in textile dyeing or ink formulations that must meet tight end-use demands. We document every run of comparative testing. On the practical level, the 2-Amino-5-sulfonic version tends to produce brighter tones and higher batch yields in specific dye syntheses. It avoids certain by-products, which saves cleanup time and reduces waste costs on the user’s side. Any substitution brings practical trade-offs, so for most operations, our users stick to this compound unless they have a strong technical driver to switch.
Explosives, photo chemicals, and even agricultural dye markers have appeared now and then as customer requests. Our team knows from those one-off jobs how custom demands sometimes call for more stringent purification or unique particle sizing, but most volume goes to large dye and pigment makers, so our main plant line stays focused on reliability. Flexibility means we keep pilot-scale gear ready for odd runs, though—we treat every inquiry as a test of our plant’s adaptability.
As operators and managers, we see the real-world differences that structure and source create for 2-Aminotoluene-5-Sulfonic Acid. Looking at market options, imported or brokered batches often show inconsistent melting points or haze when dissolved, a sure sign of shortcuts in purification or off-spec feedstock. We’ve worked to tighten every part of our process: filtration systems, batch record keeping, and root-cause checks for odd odors or color tones. Being the direct producer means our name rides on every drum and bag going out the warehouse. If a user gets a bad batch, it’s our reputation on the line—something brokers or off-brand sellers never face so directly.
As an actual manufacturer, traceability stands as a daily discipline. Each run is traceable to raw material lots, operator logs, temperature charts, and retention samples. Auditor visits from major dye and specialty chemical buyers have shown us where we meet, and sometimes exceed, the documentation and validation needed for major global producers. If a customer asks for COA details or test logs, we answer within hours, not days, thanks to in-house record-keeping. This level of detail only evolves in-house, not from trading organizations.
Process control here has always focused on more than yield. Consistency feels even more important because deviations in color strength or side impurities create cascading issues downstream. That lesson sharpened after a major pigment user told us of a production run lost to minor color drift; our root-cause analysis drove changes in reactor temperature settings and sampling frequency. Small changes matter—anyone who’s run a dye house or coater knows this from experience.
True sustainability means maintaining consistent quality while cutting waste and minimizing impact. Over time, we moved from older wet processes to updated, more contained sulfonation routes, slashing water and solvent use. Heat exchangers catch more process energy, and closed-loop filtration keeps emissions down. Waste streams are neutralized, traced, and handled under both local and international compliance. It’s not just for show—lower solvent and by-product content means safer, cleaner batches that meet customer and regulatory demands around the globe.
Experienced plant staff know how fast issues can escalate—one clogged filter or leaky valve can threaten both safety and quality. So ongoing training, new sensors, and in-person hazard assessments stay routine. Auditors from external agencies give us new insight into risk, but it’s the veteran shift leaders who speak up when something’s not right. Real company expertise means new hires learn craft on the shop floor, not just in the training room.
The world for dye intermediates keeps raising the bar. Customers push for ever-purer batches, higher yields, and more responsive logistics—even as pricing pressure never lets up. Our team meets these demands by continuous small improvements: process tweaks, more sensitive QC instruments, and faster sample turnaround. We don’t chase “one size fits all” recipes because experience proves each client needs slight adjustments—a different drying time, a tighter iron specification, or a grain size shift. Our direct line to plant operations makes this possible, while trading firms often cannot even guarantee basic batch-to-batch traceability.
Feedback from dyehouses fuels our learning loop. Years back, one of our textile clients spotted batch haze and dullness after changing application parameters. Side-by-side testing confirmed that even low-level iron or unreacted starting material would affect clarity and brightness. Implementing a new ion-exchange cleanup on the outbound line took weeks, but it eliminated the problem, showing the difference real production changes can make compared to relabeling or spot-checking an outsourced product. That’s trust built from the ground up, batch by batch.
Long-term customers have taught us more than any textbook could. Close dialogue with dye engineers and QA specialists means we hear problems first-hand and feel pressure to deliver more than routine specs. We’ve developed custom packaging to reduce handling dust and switched to reusable containers when environmental concerns came up from a few major textile firms. Regular audits and shared plant visits cement the sense of cooperation. We don’t sell an abstract product; we supply a key tool that shapes the look, cost, and performance of every batch of finished dye.
Resource squeezes and shifting regulatory frameworks challenge us every year. We don’t have the distance of a wholesaler; if an environmental agency raised a limit or a customer flagged a regulatory change, our R&D group handles it on-site, with chemical engineers and compliance staff working side by side. In a few cases, our process chemists have modified purification to meet export requirements without raising costs, simply by rerouting or tightening material flows. Such rapid response only comes from direct control and a plant floor steeped in institutional knowledge.
No process or product stays static in fine chemicals. As demand changes, so does our approach to improvement. Over the last decade, more dye users look for lower impurity levels, less environmental impact, and clear proof of origin. Some have asked about carbon footprint or cycle analysis on core intermediates, and we’ve responded with honest reporting—no greenwashing, just accurate, in-house data tracking. Waste reduction from more complete conversion of aminotoluene, and tighter steam recovery from reactors, demonstrate measurable change, not PR claims.
The pace of digital record-keeping and plant instrumentation challenges old habits. But tying real-time QC data to every batch now makes audits smoother and quality checks faster. Experience still counts most—automated monitors flag issues, but human inspection and experience-based decisions often prevent a problem from turning into a loss. Trust in manufacturing still comes down to reputation, responsiveness, and documented results more than any certification badge.
Supplying 2-Aminotoluene-5-Sulfonic Acid at commercial scale means more than shipping barrels. As the originating manufacturer, we see every tension and opportunity from start to finish. Direct oversight brings faster troubleshooting: if a user calls with a batch question or process change, our technical group digs out raw records, test results, and sample data inside the same plant—responses grounded in physical production, not downstream guesswork. Reviewing a customer’s end-to-end dye synthesis to suggest process adjustments, or adjusting our particle sizing to fit new blending machinery, happens in days, not weeks. We share not just a product, but years of production wisdom, real-world troubleshooting, and a genuine stake in every outcome.
In the end, 2-Aminotoluene-5-Sulfonic Acid anchors success in a spectrum of colorant and specialty chemical processes. Every bag or drum reflects the chain of accountability and technical care from raw material intake to finished packout. By listening to end-users, refining methods, and investing in real improvements—not just paperwork or slogans—we carry forward the know-how that earns trust batch after batch. For those who depend on consistency, reliability, and honest partnership, these details determine real value in the market, shaping both product performance and collaborative confidence well into the future.