p-Toluene sulphonic acid

p-Toluene sulphonic acid

PTSA; p-Toluenesulphonic acid; 4-Methylbenzenesulfonic acid; Tosylic acid

CAS 104-15-4

Chemical Formula C₇H₈O₃S

Molecular Weight 172.20 g/mol

p-Toluene sulphonic acid is an organic compound widely used as a catalyst in organic synthesis, particularly in esterification and polymerization reactions. It is also employed in the production of dyes, pharmaceuticals, and resins due to its strong acidic and stabilizing properties.

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Industrial Uses

1. Performance Chemicals

  • Acid Catalyst in Organic Synthesis: PTSA is widely used as a strong acid catalyst in esterification, etherification, and acetalization reactions. It is preferred in processes where water-sensitive reactions need a non-volatile acid.
  • Dehydrating Agent: It facilitates the removal of water in condensation reactions, improving yields of desired products such as esters, ethers, and unsaturated compounds.

2. Pharmaceuticals

  • Catalyst for Drug Intermediates: PTSA is involved in the synthesis of active pharmaceutical ingredients (APIs) and intermediates by accelerating key steps like cyclization and condensation.
  • Salt-Forming Agent: It is used to convert basic drugs into their tosylate salt form (e.g., Metoprolol tosylate), which often improves solubility, stability, or bioavailability.

3. Polymers & Resins 

  • Curing Catalyst for Resins: PTSA is used as a curing agent for phenolic and urea-formaldehyde resins, improving cross-linking and final mechanical properties of the resin.
  • Ring-Opening Polymerization: In the polymerization of lactones or cyclic ethers, PTSA helps initiate the reaction and maintain control over molecular weight.

4. Paints, Coatings & Adhesives

  • Resin Modification Catalyst: PTSA is used in modifying alkyd and polyester resins by promoting transesterification or polycondensation reactions.
  • Hardener in Coating Systems: Acts as a hardener in stoving enamels and cross-linking systems, enhancing hardness and durability of the coating.
  • Accelerator for Cross-Linking: Used as a reaction initiator or accelerator in adhesives, especially those based on phenolic or epoxy systems.
  • Enhancer of Thermal Stability: PTSA contributes to heat-resistant bonding formulations by stabilizing the polymer matrix under elevated temperatures.

5. Fabric Solutions

  • Catalyst in Dyeing and Finishing: PTSA is used as a pH modifier and catalyst in processes such as polyester dyeing, where acid conditions are required for optimal dye uptake.
  • Resin Treatment Agent: Applied in anti-crease and shrink-resistant fabric treatments, improving fabric performance.

Specifications

Assay ≥ 98%
Appearance White to off-white crystalline solid
Odor Slight aromatic odor
Boiling Point Decomposes before boiling
Melting Point 103 – 106 °C
Density 1.24 g/cm³ (at 20 °C)
Solubility Soluble in water, ethanol, and methanol
Viscosity Not applicable (solid form)
Flash Point > 100 °C (closed cup)

Hazard Symbols

Corrosives
Irritants/Sensitisers/Other Hazards

FAQs

1. What is the current price of p-Toluene sulphonic acid in India?
The price p-Toluene sulphonic acid can vary based on factors such as purity, quantity, etc. For the most accurate and competitive pricing, please contact us at +91.6301 00 6301 directly for a customized quote tailored to your needs.

2. Where can I buy p-Toluene sulphonic acid in India?
You can purchase p-Toluene sulphonic acid from MULTICHEM, a leading exporter with a reputation for quality and reliability. We provide convenient options for bulk orders and direct shipments across global markets. For more details on how to place an order, please visit our website or contact our sales team.

3. What is the minimum order quantity (MOQ) for p-Toluene sulphonic acid?
Our minimum order quantity (MOQ) p-Toluene sulphonic acid is designed to cater to both small-scale and large-scale needs. The MOQ depends on the packing size of the product which could range from 25 kg to 250kg.

4. How can I ensure the quality of p-Toluene sulphonic acid supplied by Multichem?                   
We adhere to stringent quality control processes to ensure that our products meet the highest standards of purity and effectiveness. They undergo rigorous testing and quality checks to guarantee that they comply with industry specifications. We provide a Certificate of Analysis (CoA) with every shipment to ensure transparency and quality assurance.