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HS Code |
523528 |
| Chemical Name | 4-Ethylbenzenesulfonic Acid |
| Cas Number | 123-63-7 |
| Molecular Formula | C8H10O3S |
| Molecular Weight | 186.23 g/mol |
| Appearance | White to off-white crystalline powder |
| Boiling Point | 372.10°C at 760 mmHg |
| Melting Point | 164-167°C |
| Solubility In Water | Soluble |
| Density | 1.25 g/cm3 |
| Pka | −2.3 |
| Smiles | CCc1ccc(cc1)S(=O)(=O)O |
| Ec Number | 204-641-2 |
| Synonyms | p-Ethylbenzenesulfonic acid |
| Pubchem Cid | 7677 |
| Hazard Statements | Causes skin irritation |
As an accredited 4-Ethylbenzenesulfonic Acid factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | 250g of 4-Ethylbenzenesulfonic Acid packaged in a sealed, amber glass bottle with chemical-resistant screw cap and safety labeling. |
| Shipping | 4-Ethylbenzenesulfonic Acid should be shipped in tightly sealed, corrosion-resistant containers. Store and transport it in a cool, dry, well-ventilated area away from incompatible substances, such as strong bases and oxidizers. Clearly label the package, and comply with local, national, and international regulations regarding handling and transportation of corrosive chemicals. |
| Storage | 4-Ethylbenzenesulfonic acid should be stored in a tightly closed container, in a cool, dry, and well-ventilated area. Keep away from incompatible substances such as strong bases and oxidizing agents. Store at room temperature, away from moisture, heat, and direct sunlight. Properly label storage containers and ensure secondary containment to prevent spills or leaks. |
Applications of 4-Ethylbenzenesulfonic Acid in Industrial Manufacturing4-Ethylbenzenesulfonic acid serves as a vital intermediate and functional additive in several specialized chemical manufacturing sectors. Our production processes focus on maintaining high purity and batch consistency to support downstream industries requiring advanced process control, regulated compliance, and precise formulation accuracy. 1. Production of Anionic Surfactants for Detergent ManufacturingThis acid functions as a sulfonation agent in the synthesis of linear alkylbenzene sulfonates (LAS), a primary surfactant component in powder laundry and dishwashing detergents. End-users incorporate it during the sulfonation step, ensuring controlled molecular weight for foaming and cleaning efficacy. Material stability, controlled acidity, and low impurity profile are necessary to avoid side reactions during sulfonation, which is critical for downstream product performance and regulatory approval in global household and institutional cleaning markets. Industry compliance standards
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2. Synthesis of Dye Intermediates in Textile Chemical ManufactureMany azo and triphenylmethane dye intermediates require sulfonic acid group introduction for water solubility and fiber reactivity. In this sector, 4-ethylbenzenesulfonic acid provides a controlled source of sulfonic function, improving solubilization and dye bath penetration. Its purity and stability ensure high-performance dye yields, and it avoids formation of undesired by-products which could cause color migration or textile fastness failures. Industry compliance standards
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3. Catalytic Acid for Resins and Polymer SynthesisPolymer and thermoset resin manufacturers use the acid as a strong, non-volatile acid catalyst, particularly in condensation polymerizations such as phenolic, amino, and polyester resins. The acid provides robust catalytic strength while imparting sulfonic functional compatibility, enabling controlled resin cure rates and improved cross-link density in final products. Its consistent acidity and low residue profile support QC processes required by molded composite, coating, and electrical insulate manufacturers. Industry compliance standards
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4. Organic Synthesis Intermediate for Pharmaceutical APIsPharmaceutical manufacturers use the material as a sulfonating agent during the synthesis of select active pharmaceutical ingredient (API) intermediates, especially where enhanced aqueous solubility and salt formation are needed for downstream crystallization or purification. Controlled addition helps prevent impurity carryover and supports the process validation needs of drug substance manufacturing plants operating under strict regulatory oversight. Industry compliance standards
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5. Electroplating Bath Additive in Metal FinishingIn surface finishing, the acid functions as a conductivity enhancer and grain refiner in certain electroplating baths, chiefly for bright nickel and acid zinc depositions. Its introduction moderates bath pH, improves metal ion mobility, and enables a finer, more uniform deposit layer. Bath formulation and replenishment require careful QC based on in-process titration and trace analysis to prevent buildup of secondary sulfonates that could cause poor adhesion or deposit haze. Industry compliance standards
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6. Water Treatment Chemical SynthesisProducers of specialty water treatment chemicals utilize the acid to introduce hydrophilic sulfonic groups into organic antiscalant and corrosion inhibitor molecules. Its precise control of molecular sulfonation increases dispersibility and improves anionic character, which elevates effectiveness in both potable and industrial water circuits. Monitoring of active group incorporation and residual acid is essential for safety and downstream system performance. Industry compliance standards
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At the heart of our day-to-day work, 4-Ethylbenzenesulfonic Acid forms the backbone of several technical solutions. For years, long before the name became common in formulation circles, we worked alongside batches and process tanks, watching how this sulfonic acid brings structure and function to products that demand more than just average performance. Clarity, control, and reliability — these never emerge by chance. Hands-on experience with each run teaches a chemical manufacturer what simply reading a certificate of analysis cannot.
From the raw materials to polishing off the last batch of the week, our focus always returns to quality and consistency. 4-Ethylbenzenesulfonic Acid, with its model designation 4-EBS-A98, holds a purity not less than 98% (HPLC, dry basis). Part of what sets this product apart results from how it behaves at every critical step: solubility, reactivity with bases, and its sharp, well-defined melting profile. Most product users ask about water content and clarity. What stands out most in our experience is how this acid dissolves easily, even in industrial water supplies that do not meet ‘perfect’ lab standards. Color intensity and particle size distribution come from close attention to drying and crystallization, not from shortcuts or speculative “batch tuning.”
Much of the confidence our customers show comes back to repeatability. When you charge a reactor with our 4-Ethylbenzenesulfonic Acid, pH drops sharply and predictably, without slow trailing or unexpected exotherms. If a batch ever behaves unpredictably, our own staff are first to notice — not external testers, not untrained hands in remote warehouses. Because we manufacture, not just buy and resell, every drift and detail shows up quickly. This tight connection to the supply chain makes all the difference for customers who can’t tolerate downtime or rework.
Sulfonic acids do not forgive laziness during sulfonation. We run each charge in glass-lined reactors, keeping by-products below trace levels. This means side-acids and unreacted toluene derivatives never pile up where they shouldn’t. After every separation and distillation pass, our team samples in-process, not just finished goods. By doing so, we catch small impurities early, keeping the final product clean — in color, odor, and by titration curves.
Lab reports list purity and sodium content, but in the plant, other concerns come into play. Small variations in sulfonation temperature can tilt the ratio of ortho to para isomers. Making 4-Ethylbenzenesulfonic Acid instead of related sulfonic acids isn’t simply a change of raw material. It means selective reaction control every hour, adjustment of vacuum and airflow to head off discoloration, and extra filtration cycles to bring down ash. Quality in this field comes less from theory, more from habit, vigilance, and clean tanks after every campaign.
Over decades, we’ve supplied this acid to water treatment chemical blenders, alkylbenzene sulfonate producers, and resin formulators. In each case, it brings something distinct. Water treatment users look for low salt by-products, so we tune our dryers to hold residual salts below 0.5%. Alkylation catalyst blenders watch for melting range and flow. Our customers in polymer synthesis measure viscosity impact and color pickup — too much yellow tinge shows side reactions. By holding to narrow purity and particle size specs, we help keep their processes smooth and waste free.
Process engineers rarely ask for perfect numbers on paper; they seek repeat‐run reliability. In our plant, operators spotbatch-to-batch differences long before sales teams hear about them. Viscosity, pourability, and reactivity with bases hint at process trouble before official reports ever land. Years of running sulfonic acid lines has taught us to trust those small signs more than the most official datasheet.
When comparing 4-Ethylbenzenesulfonic Acid to its relatives — p-Toluenesulfonic Acid, Benzene Sulfonic Acid, or Dodecylbenzenesulfonic Acid — the contrasts go beyond the textbook. Each offers a different backbone for surfactant, catalyst, or specialty resin processes. The C2-ethyl group gives 4-Ethylbenzenesulfonic Acid a melting point and reactivity window distinct from p-Toluenesulfonic Acid. We’ve found our model stays drier and flows better under summer heat, which matters to bulk handlers facing humid storerooms.
Our production avoids broad spectrum acids from mixed ratios; we target the single isomer, giving sharper, more defined titration results. In resin manufacturing or water treatment, that brings a narrower range of reaction rates and more predictable product yield. While Dodecylbenzenesulfonic Acid has a surfactant profile well-suited to cleaning, 4-Ethylbenzenesulfonic Acid finds use in more technical synthesis where aggressive acidity and compact molecules drive the chemistry.
End-users tell us our product stands out for clarity and lack of settled residue, even in systems without mechanical mixing. Fine particle control remains one of our slowest and most stubborn challenges, especially when scaling up between drums and bulk. After years refining this process, our in-plant sieving and screening ensure every shipment matches the particle specs agreed with partners.
We keep our spec sheet plain because every excess claim means complications on the floor. Bulk density, for example, looks routine, but if it falls outside the expected margin, filling lines jam or caking occurs at the bottom of containers. Our teams check each intermediate blend not out of habit, but because the lessons of previous campaigns show even tiny shifts in humidity can impact both handling and shelf life.
Acid value, measured in mgKOH/g, links not only to reactivity but also to downstream safety for alkylation and condensation runs. Here, purity and trace metals show up unmistakably in finished product color and stability. We audit source materials and watch for bad actors from iron contamination. Small changes in supplier solvent purity push us to tune our final filters, preferring multi-step filtration over a single high-volume pass.
Originally, we met requests for 4-Ethylbenzenesulfonic Acid mainly from local resin plants. Over time, this changed. Now, formulators in fields ranging from water purification to specialty lubricants ask for precise sulfonation, low color index, and minimal ash. Each branch of industry discovers its own small kinks — stability of their own boiling point, impact of minor impurities on finished polymer bead size, or the way trace organics influence blending.
With each application, the feedback loop runs through our QC and process teams, directly back to the reactor floors. We stay in touch with technical leads from end-users, not just through emails or datasheets, but by sharing batch variation reports and visits for process troubleshooting. Sometimes, only a site visit reveals a storage pit trap or process heater glitch affecting final blending. As a manufacturer, we bring these lessons home to each production run, tuning for local water composition, ambient humidity, or altered procedural steps at customer sites.
Users notice the product difference first not in an analytical report, but by how fast 4-Ethylbenzenesulfonic Acid dissolves in their vessels. While similar benzenesulfonic acids might clump or leave a film, our run taps a sharp, crystalline structure that pours without dust plumes and settles evenly. In the plant, workers complain less about grainy batch bottoms or unplanned lumps. This consistency shifts from small laboratory feeds up to large, automated batch lines.
Handling, of course, brings safety and regulatory flags. We package the product in lined drums and sealed bags, no contact with plain steel, since corrosion or odd color shifts can signal trouble after long-distance transport. Feedback from logistics teams tells us minor leaks or caking do not go unnoticed; we inspect and secure closures tightly, preferring to run longer packaging hours rather than rush and risk lost cargo quality.
Modern industry asks more than ‘can you supply’ — the questions now reach source accountability, effluent disposal, and user safety in the factory. Our production cycle for 4-Ethylbenzenesulfonic Acid meets the latest environmental targets for reduced sulfonating gas emissions. Rather than rout streams to generic waste, we recover and reuse wherever possible, capturing by-products and monitoring all discharges. We work closely with regional environmental teams to stay within thresholds, taking pride in audits that confirm our figures, not just claims.
Product stewardship for us means more than ticking regulatory boxes. Training new fleet drivers on drum handling, working with service providers to ensure they understand material hazards, and keeping MSDS and support lines updated comes standard. Our commitment shows up in safer storage, less product loss, and fewer plant incidents down the supply chain. Customers talk to our technical staff directly for troubleshooting — the feedback loops roll back into our plant improvement programs, shaping both batch protocols and field support.
Every volume request carries its own quirks. We plan each production campaign after phone calls with technical teams, discussing project details — whether a 500 kg lot for lab development or 20 MT bulk order for continuous operation. If a water treatment customer faces stricter limits on sulfate residue, we listen, trial a pilot lot, and log every step of the adjustment. Repeat business seldom comes from promises alone — it comes from batches that run smoothly and meet specs with no surprises.
Having our own chemical engineers run every stage brings a feedback loop other supply models can’t match. We hold internal autopsies on any batch deviation, tearing down reactor logs, utilities data, and QC slips until the root cause appears. Input from outside operators and customers helps refine our process design, whether turning up the heat transfer, fine-tuning the neutralization, or revising quick-wash cycles on filters.
Making 4-Ethylbenzenesulfonic Acid is not without hiccups. The biggest headaches come from trace impurities and the never-ending hunt for cleaner reaction profiles. The shift from batch to continuous reactors helped with flow control and yield, but new issues surfaced: fine sulfur specks, higher maintenance on reactor linings, and the occasional runaway batch needing rapid cooling. Operator skill bridges the gap between minor slips and full production runs that reach the customer without hitch.
Scaling up from pilot plant to industrial quantity remains a trial by patience. Where a small glass vessel runs clean at lab scale, a full-scale reactor throws new wrinkles — unplanned pressure spikes, inconsistent stir speeds, or the smallest mineral trace from plant water that triggers batch-to-batch variance. We solve these not from manuals, but from combining operator experience, flexible maintenance teams, and hands-on management that knows each piece of equipment by sight, sound, and feel.
Few things teach as much as lifting bags, pulling samples, and checking columns for stray off-color fractions. Chemical manufacturing moves forward not through marketing, but through measured steps and the drive to understand every reaction and return. Products like 4-Ethylbenzenesulfonic Acid do not tolerate indifference: the smallest variation in a single reagent shifts the outcome for a full batch. Our plant practices keep learning central — mistakes logged, solutions documented, successes shared among the entire team.
Partnerships grow from this approach. Customer audits, instead of interrupts, become chances for fresh eyes to spot improvement points: tighter process control, cleaner handling, or savings in water and power. We take pride knowing our reporting and plant maintenance logs stand up to scrutiny, from first drum to final shipment of the season.
The world moves on, and so do customer needs. New regulations, demands for lower residuals, or faster blending routines pose fresh problems for even the most established plants. Our teams review industry journals, attend field days, and keep direct contact with customer process engineers. A part may look perfect by traditional metrics, but real-world use in a downstream reactor tells the real story. Preparation for these challenges starts long before a spec, through close listening, a willingness to review old practices, and daily design of future improvement projects.
In chemical manufacturing, especially with sulfonic acids, reputation builds batch by batch, through delivered quality, field-verified performance, and open lines of communication. As an experienced manufacturer of 4-Ethylbenzenesulfonic Acid, we back every lot with technical insight, process ownership, and a record that invites review—not just from the lab bench but from those who use and rely on our material every day. That partnership, far more than a spec sheet or market trend, shapes what we produce and how we move forward in this changing field.