Changzhou Taihua Chemical Raw Materials Co., Ltd. stands as a premier manufacturer and global supplier of high-purity phenolsulfonic acid (CAS 98-67-9), a versatile organic acid that serves as a critical intermediate and catalyst across numerous industrial sectors. Our phenolsulfonic acid, also known as 4-hydroxybenzenesulfonic acid or phenol-4-sulfonic acid, is produced under stringent quality controls to ensure consistent performance in demanding applications such as polymerization catalysis, oilfield chemical formulations, metalworking fluids, textile dye manufacturing, and specialty chemical synthesis. With over two decades of specialized experience in the production of sulfonic acid derivatives, our company has built a reputation for reliability, technical expertise, and customer-centric service that spans across domestic and international markets. The molecular formula C6H6O4S and molecular weight of 174.2 g/mol define this strong organic acid, which is typically supplied as a clear to brown aqueous liquid with pronounced acidity and excellent solubility in water and polar organic solvents. Our commitment to quality begins at the raw material stage and continues through every step of synthesis, purification, and packaging, ensuring that each batch of phenolsulfonic acid meets or exceeds the specifications required by our diverse clientele. Whether you need a consistent supply for ongoing production or a custom formulation for a specialized application, Changzhou Taihua Chemical has the capability and the dedication to deliver the right solution for your business needs.

Phenolsulfonic acid is a bifunctional aromatic compound that combines a phenolic hydroxyl group with a sulfonic acid group on the same benzene ring, giving it unique reactivity and solubility characteristics that make it indispensable in many chemical processes. As a strong acid with a pKa comparable to that of sulfuric acid in its first dissociation, it acts as an effective proton donor in catalytic applications while offering the additional advantage of being less corrosive and easier to handle than mineral acids in certain contexts. The compound is typically supplied as a 65% aqueous solution, though other concentrations can be produced to meet specific customer requirements, and it appears as a clear to brown liquid depending on concentration and storage conditions. Important physical properties include a boiling point that varies with concentration, a density of approximately 1.2–1.3 g/cm³ at room temperature, a flash point above 100°C for the aqueous solution, and a strongly acidic pH below 1 for concentrated grades. These properties make phenolsulfonic acid particularly well-suited for use as a catalyst in Friedel-Crafts alkylation and acylation reactions, as a curing agent for phenolic resins, and as a key component in formulations for the oilfield and metalworking industries. Our production process employs advanced sulfonation technology that yields a product with minimal impurities, including strict control of iron content to ≤50 ppm, free phenol to ≤1.0%, and free sulfuric acid to ≤2.8%, ensuring consistent performance and reducing the risk of side reactions in sensitive applications. Each batch is thoroughly tested in our quality control laboratory using standardized analytical methods to verify purity, acidity, color, and impurity profiles before release to inventory or shipment to customers.

At Changzhou Taihua Chemical, we maintain strict adherence to both internal quality standards and international specifications to ensure that every shipment of phenolsulfonic acid meets the highest expectations of our customers across diverse industries. Our standard product specification for the 65% aqueous solution requires a minimum phenolsulfonic acid content of 65%, with typical values reaching 66-68%, along with tight limits on critical impurities that could affect downstream processes. The iron content is controlled to no more than 50 parts per million, because iron can catalyze unwanted oxidation reactions in certain applications such as textile dye manufacturing and metalworking fluid formulations where color stability and corrosion performance are paramount. Free phenol content is limited to 1.0% or less, as residual phenol can contribute to odor, toxicity concerns, and interference with polymerization reactions, while free sulfuric acid is capped at 2.8% to prevent excessive acidity and corrosion in end-use applications. Beyond these chemical parameters, we also monitor physical properties such as color (typically dark brown for the standard grade), specific gravity, and clarity to ensure product consistency from lot to lot and from season to season. Our quality management system is built on the principles of ISO 9001, and we continuously invest in laboratory equipment, personnel training, and process optimization to maintain our position as a trustedHome supplier in the global chemical market. Each batch is assigned a unique lot number, and retained samples are stored for the full shelf life of the product to support traceability and customer peace of mind in the event of any quality inquiry or performance investigation.

One of the most significant uses of phenolsulfonic acid is as a catalyst in the production of phenolic resins, epoxy curing systems, and other thermosetting polymers where strong acidity combined with good solubility and low volatility is required. In the manufacture of phenol-formaldehyde resins, for example, phenolsulfonic acid catalyzes both the addition and condensation reactions that build the three-dimensional polymer network, offering faster cure times and improved control over resin properties compared to conventional acid catalysts. The sulfonic acid group provides strong proton-donating ability that accelerates the methylolation of phenol and subsequent condensation to form methylene linkages, while the phenolic hydroxyl group can participate in the polymer structure, potentially improving compatibility and reducing the need for additional modifiers. Many formulators prefer phenolsulfonic acid over p-toluenesulfonic acid or sulfuric acid because it combines effective catalysis with lower corrosivity, reduced risk of over-catalysis, and improved handling characteristics in production environments. For epoxy resin systems, phenolsulfonic acid serves as a latent curing agent or accelerator, particularly in formulations designed for high-temperature applications such as electrical laminates, composites, and adhesives where thermal stability and mechanical strength are critical performance metrics.

The oil and gas industry relies on phenolsulfonic acid as a component in drilling fluid additives, cementing formulations, and stimulation chemicals where its acidity and surfactant properties contribute to effective formation treatment and fluid performance. In drilling muds, phenolsulfonic acid acts as a thinner and dispersant, helping to control viscosity and prevent the aggregation of clay particles, which improves hole cleaning and reduces the risk of stuck pipe during drilling operations. For metalworking fluids, phenolsulfonic acid functions as a corrosion inhibitor, extreme pressure additive, and emulsifier in both water-based and oil-based formulations used in machining, grinding, and forming operations across the automotive, aerospace, and general manufacturing industries. The compound's ability to form stable complexes with metal ions at active surfaces helps protect freshly machined parts from oxidation and corrosion, while its acidic nature contributes to the activation of other additive packages in the fluid formulation. Metalworking fluid manufacturers appreciate the consistent quality and predictable performance of our phenolsulfonic acid, which allows them to maintain tight control over their finished product specifications and deliver reliable performance to end users in demanding production environments. Our technical support team works closely with oilfield and metalworking customers to optimize formulations and troubleshoot any performance issues that may arise during product development or field application.

In the textile industry, phenolsulfonic acid is employed as a key intermediate in the synthesis of certain azo dyes, acid dyes, and optical brighteners where the sulfonic acid group imparts water solubility and affinity for natural and synthetic fibers. The compound can be used directly as a dye bath additive to adjust pH and improve dye uptake, or it can be chemically modified to produce more complex sulfonated intermediates that are then incorporated into finished dyestuffs. Textile dye manufacturers value the high purity and consistent composition of our phenolsulfonic acid because variations in impurity levels can cause shade shifts, reduced color fastness, or uneven dyeing results that are costly to correct in production. Beyond textiles, phenolsulfonic acid serves as a versatile building block for a wide range of chemical intermediates used in the production of pharmaceuticals, agrochemicals, surfactants, and plasticizers. The sulfonic acid group can be converted to sulfonyl chlorides, sulfonamides, or sulfonate esters, providing access to a broad family of functional compounds with applications in drug synthesis, crop protection, and materials science. OurProduct range includes various grades of phenolsulfonic acid tailored to the specific needs of these diverse application areas, and we welcome inquiries about custom specifications or modified packaging requirements.

Changzhou Taihua Chemical Raw Materials Co., Ltd. brings more than 20 years of specialized experience in the development, production, and supply of phenolsulfonic acid and related sulfonic acid derivatives, making us a knowledgeable and reliable partner for businesses around the world. Our manufacturing facility is equipped with state-of-the-art sulfonation reactors, purification systems, and analytical instruments that allow us to produce consistently high-quality product while maintaining the production flexibility needed to accommodate both standard and custom orders. We understand that supply chain reliability is just as important as product quality, which is why we have established robust raw material sourcing agreements, maintain adequate finished goods inventory, and operate efficient logistics networks that ensure timely delivery whether you need a single pallet of drums or a full bulk tanker shipment. Our customers benefit from competitive pricing that reflects our manufacturing scale and operational efficiency, without any compromise on quality or service levels. We offer a full range of packaging options including 55-gallon drums, 275-gallon intermediate bulk containers (IBC totes), and bulk tanker truck deliveries, as well as custom packaging configurations for customers with specialized requirements. Our technical service team works closely with customers to understand their processes and recommend the optimal product grade, concentration, and packaging format for their specific application, and we are always ready to develop custom formulations or modified specifications when standard products do not fully meet the need.

Our long-standing relationships with upstream raw material suppliers and our strategic location in the chemical industrial zone of Changzhou, Jiangsu Province, provide us with a stable and cost-competitive supply chain that benefits our customers through consistent product availability and favorable pricing. We continuously monitor market conditions and adjust our procurement and production plans to mitigate the impact of raw material price fluctuations and supply disruptions, ensuring that our customers can count on us even during periods of market volatility. Our manufacturing processes are designed for efficiency, yield optimization, and waste minimization, which allows us to offer attractive pricing without sacrificing the quality or consistency that our customers depend on. Additionally, we hold relevant ISO certifications that demonstrate our commitment to quality management, environmental responsibility, and continuous improvement across all aspects of our operations. To learn more about our company history, values, and manufacturing capabilities, please visit ourAbout Us page, where you can explore the story behind our success and the team that makes it possible.

We recognize that every customer has unique requirements, which is why we offer customized service options that range from tailored product specifications to specialized packaging, labeling, and documentation support. Our Customizedservice page provides an overview of the additional capabilities we can bring to your supply chain, including custom concentration adjustments, blended formulations, private labeling, and just-in-time inventory programs. Our technical support team is staffed by experienced chemists and chemical engineers who understand the practical challenges of incorporating phenolsulfonic acid into industrial processes, and they are available to provide formulation assistance, troubleshooting guidance, and application development support. Whether you are developing a new oilfield chemical formulation, optimizing a metalworking fluid recipe, or scaling up a textile dye synthesis, we can help you select the right product grade and provide the technical data you need to succeed. We also welcome opportunities to collaborate on research and development projects that explore new applications or improved processing methods for phenolsulfonic acid, leveraging our combined expertise to create value for both organizations.

We invite you to submit an inquiry through our contact form to request a quotation, obtain a sample, or discuss your specific requirements with our sales and technical team. When you contact us, please provide details about your intended application, desired concentration and purity, annual volume requirements, and any special packaging or delivery preferences so that we can respond with the most relevant information and pricing. To help you evaluate our product more thoroughly, we offer downloadable product data sheets and safety data sheets in PDF format that contain detailed physical and chemical properties, handling guidelines, storage recommendations, and regulatory information. For customers who work with multiple sulfonic acid derivatives or related chemical intermediates, we encourage you to browse our fullProduct portfolio, which includes other sulfonic acids, specialty additives, and intermediates that complement phenolsulfonic acid in various applications. Stay informed about company developments, product innovations, and industry insights by visiting our News page, where we regularly publish updates about our company and the markets we serve. Our team is committed to providing fast, professional responses to all inquiries and to building long-term partnerships based on trust, quality, and mutual success in the global chemical marketplace.

Phenolsulfonic acid, also known as 4-hydroxybenzenesulfonic acid or phenol-4-sulfonic acid, is an organic compound with the CAS number 98-67-9. It has the molecular formula C6H6O4S and a molecular weight of 174.2 g/mol, and it typically appears as a clear to brown aqueous liquid with strong acidity.

Our standard product is a 65% aqueous solution of phenolsulfonic acid, but we can supply other concentrations based on customer requirements. The 65% grade offers an excellent balance of acidity, handling properties, and cost-effectiveness for most industrial applications.

Phenolsulfonic acid is widely used as a catalyst in polymerization and resin curing, as a component in oilfield chemicals and drilling fluids, in metalworking fluids as a corrosion inhibitor and extreme pressure additive, in textile dye manufacturing, and as a chemical intermediate for producing pharmaceuticals, agrochemicals, and surfactants.

We maintain rigorous quality control at every stage of production, from raw material inspection to final product testing. Each batch is analyzed for purity, iron content (≤50 ppm), free phenol (≤1.0%), free sulfuric acid (≤2.8%), and other key parameters using standardized methods in our ISO 9001-aligned quality management system.

We offer a range of packaging options including 55-gallon (210-liter) drums, 275-gallon (1,040-liter) IBC totes, and bulk tanker truck deliveries. Custom packaging configurations are also available upon request to meet specific handling, storage, or labeling requirements.

While both are sulfonic acid catalysts, phenolsulfonic acid contains a phenolic hydroxyl group in addition to the sulfonic acid group, which gives it different solubility, reactivity, and compatibility characteristics. Phenolsulfonic acid is often preferred in phenolic resin systems because the phenolic group can participate in the polymer structure, and it offers lower corrosivity in certain applications compared to p-toluenesulfonic acid.

Yes, we offer customized service options including custom concentration adjustments, blended formulations, and modified specifications to meet specific customer requirements. Please contact our sales team with your detailed needs, and we will work with you to develop the right solution.

Phenolsulfonic acid is a strong acid and should be handled with appropriate personal protective equipment including gloves, safety goggles, and acid-resistant clothing. It should be stored in corrosion-resistant containers away from bases and oxidizing agents. A full safety data sheet (SDS) is available for download from our website, and we recommend reviewing it thoroughly before product use.

You can submit an inquiry through our website contact form with details about your application, desired concentration, estimated annual volume, and any special requirements. Our sales team will respond promptly with a quotation and information about sample availability based on your needs.

Yes, we export our products to customers around the world through our established logistics network. We have experience with international shipping documentation, hazardous material classification, and customs clearance procedures, and we can arrange delivery by sea freight, air freight, or land transport depending on the destination and order volume.