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4-Ethylbenzenesulfonic Acid

    • Product Name 4-Ethylbenzenesulfonic Acid
    • Alias 4-Ethylbenzenesulfonic acid
    • Einecs 205-482-9
    • Mininmum Order 1 g
    • Factory Site Tengfei Creation Center,55 Jiangjun Avenue, Jiangning District,Nanjing
    • Price Inquiry admin@sinochem-nanjing.com
    • Manufacturer Sinochem Nanjing Corporation
    • CONTACT NOW
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    Specifications

    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 & Storage
    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.
    Application of 4-Ethylbenzenesulfonic Acid

    Applications of 4-Ethylbenzenesulfonic Acid in Industrial Manufacturing

    4-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 Manufacturing

    This 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

    • REACH (EC) No 1907/2006 registration for surfactant raw materials
    • US EPA TSCA listing for detergent chemistry inputs
    • ISO 9001 quality management for raw material traceability
    • EN 1276 and EN 13727 for final product disinfection efficacy testing

    Typical usage ratio

    • Application ratio of 4-12% by mass in sulfonation feed formulations, adjusted based on required chain length and degree of sulfonation

    Downstream process integration

    • Introduced directly into the sulfonator/reactor during alkylbenzene transformation
    • Requires precise pH monitoring and temperature control to minimize by-product formation
    • Followed by neutralization and granulation stages prior to blending with builders and co-surfactants

    Final product types

    • Laundry powders
    • Automatic dishwashing powders
    • Industrial and institutional cleaning formulations
    • High-activity liquid surfactant concentrates

    2. Synthesis of Dye Intermediates in Textile Chemical Manufacture

    Many 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

    • ZDHC MRSL compliance for input safety in textile chemistry
    • ISO 9001:2015 for textile chemical additive supply
    • OEKO-TEX® Standard 100 Class I restricted substance limits
    • Global Organic Textile Standard (GOTS) compatibility assessment

    Typical usage ratio

    • Ranges from 1.5-7% by mass in dye-coupling reaction batches, tuned according to chromophore structure and final solubility requirements

    Downstream process integration

    • Added to coupling vessels during diazotization and sulfonation steps
    • Requires continuous agitation and in-process pH monitoring to stabilize reactive intermediates
    • Feeds into neutralization tanks prior to spray-drying or granulation for shipment

    Final product types

    • Reactive and direct textile dyes
    • Disperse dye intermediates
    • Azo pigment dispersions
    • Specialty colorants for synthetic fibers and blends

    3. Catalytic Acid for Resins and Polymer Synthesis

    Polymer 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

    • ISO 14001 for chemical processing environmental controls
    • ASTM D1613 for acid catalyst content quantification
    • UL 94 testing for flame-retardant composite polymers
    • RoHS Directive 2011/65/EU for polymer additives in electrical/electronic equipment

    Typical usage ratio

    • Between 0.2-2.5% by mass in resin kettle charge, calibrated for resin viscosity and end-use cure time

    Downstream process integration

    • Added at the start of condensation reactions in batch or continuous reactors
    • Assists in forming sulfonated resin chains with improved dispersibility and mechanical performance
    • Deactivated during neutralization step after polymerization completion

    Final product types

    • Phenolic molding compounds
    • Melamine-formaldehyde resins for decorative laminates
    • Cationic exchange resins
    • Polyester composite base resins

    4. Organic Synthesis Intermediate for Pharmaceutical APIs

    Pharmaceutical 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

    • Current Good Manufacturing Practice (cGMP) under 21 CFR Parts 210 and 211
    • ICH Q7 on GMP for Active Pharmaceutical Ingredients
    • Ph. Eur., USP, and JP pharmacopoeia for sulfonic intermediates
    • FDA DMF (Drug Master File) referencing for raw material traceability

    Typical usage ratio

    • Typically 0.5-3% by weight in API intermediate syntheses, optimized based on desired salt formation yield and downstream chromatographic recovery

    Downstream process integration

    • Used during key sulfonation steps in small molecule API routes
    • Reaction time and stoichiometry adjusted per route to minimize over-sulfonation and facilitate API crystallization
    • Purge and residual controls set according to API impurity profile requirements

    Final product types

    • Pharmaceutical sulfonate salt APIs
    • Sulfa drug intermediates
    • Solubility-enhanced active substances
    • Precursors for high-purity injectable ingredients

    5. Electroplating Bath Additive in Metal Finishing

    In 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

    • ISO 4527 for electroplated coatings
    • ASTM B680 for nickel deposits
    • RoHS and ELV directives for finished metal components
    • REACH Annex XVII restriction checks for chemical additives

    Typical usage ratio

    • Used at 0.03-0.2% by bath volume, refined with periodic analysis as plating load and bath turnover rates vary

    Downstream process integration

    • Dosed into freshly prepared or replenished electroplating solutions
    • Requires continuous agitation to ensure homogeneity throughout bath volume
    • Regularly monitored for breakdown by-products and pH drift

    Final product types

    • Bright nickel plated components for automotive and consumer goods
    • Acid zinc-plated fasteners and connectors
    • Decorative chrome-underlayer finishes
    • PCBs requiring uniform conductor deposition

    6. Water Treatment Chemical Synthesis

    Producers 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

    • ANSI/NSF Standard 60 for chemicals added to drinking water
    • ISO 9001 and ISO 14001 certification for process and environmental management
    • U.S. EPA guidelines for water treatment additives
    • EN 15040:2011 for corrosion inhibitors in drinking water

    Typical usage ratio

    • Varies from 0.8-5% by mass in antiscalant synthesis batches; adjusted according to active group content and polymer backbone length

    Downstream process integration

    • Added at sulfonation step in controlled-reactor synthesis of polymeric inhibitors
    • Temperature and pH adjustments performed to control sulfonic group incorporation
    • Downstream purification performed to minimize residual acids prior to formulation and packaging

    Final product types

    • Phosphonate and polymeric antiscalants
    • Specialty dispersants for cooling tower water
    • Anionic corrosion inhibitor blends
    • Boiler and closed system maintenance chemicals
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    Certification & Compliance
    More Introduction

    4-Ethylbenzenesulfonic Acid: Experience and Insight from the Manufacturer’s Floor

    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.

    Our Approach to 4-Ethylbenzenesulfonic Acid

    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.

    The Roots of Purity and Performance

    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.

    Using 4-Ethylbenzenesulfonic Acid on the Line

    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.

    Key Points: How Our 4-Ethylbenzenesulfonic Acid Differs from the Rest

    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.

    Technical Details That Matter—From Factory Floor Experience

    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.

    How 4-Ethylbenzenesulfonic Acid Has Grown Into Broader Use

    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.

    Working With Our Acid—Differences in Practical Outcomes

    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.

    Supporting Sustainable and Safe Use

    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.

    Tailoring Output to Customer Needs—Direct Manufacturer Responsibility

    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.

    Challenges and Real-World Solutions in Manufacturing

    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.

    Why Direct Manufacturing Experience Outpaces Generic Supply

    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.

    Next Steps — Looking Forward in 4-Ethylbenzenesulfonic Acid Manufacturing

    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.