Description

p-Toluenesulfonic Acid Monohydrate is a versatile and highly effective organic acid catalyst and reagent widely used in industrial synthesis. Its strong acidity and solubility in organic solvents make it a superior alternative to mineral acids for numerous condensation, esterification, and polymerization reactions. This compound is essential for manufacturers and R&D laboratories in the pharmaceutical, agrochemical, polymer, and specialty chemical industries seeking efficient and selective acid catalysis.

Application

• Pharmaceutical Synthesis: A key catalyst and reagent in the production of active pharmaceutical ingredients (APIs), particularly for esterification and protection/deprotection reactions.
• Polymer Industry: Used as a curing agent and catalyst in the production of phenolic, epoxy, and alkyd resins, as well as in polycondensation reactions.
• Agrochemical Manufacturing: Employed in the synthesis of pesticides, herbicides, and plant growth regulators where controlled acid catalysis is required.
• Dye and Pigment Production: Acts as a catalyst in sulfonation and condensation reactions to create various colorants.
• Organic Synthesis & Fine Chemicals: A staple reagent for laboratory and industrial-scale organic transformations, including Friedel-Crafts alkylation and the synthesis of fragrances and flavors.
• Crosslinking Agent: Utilized in coatings, adhesives, and composite materials to promote crosslinking and enhance final product properties.

Basic Information

Product Name	p-Toluenesulfonic Acid Monohydrate
CAS No.	6192-52-5
Molecular Formula	C7H8O3S · H2O
Molecular Weight	190.22 g/mol
Synonyms	4-Methylbenzenesulfonic Acid Monohydrate; Toluenesulfonic Acid Monohydrate; p-TSA Monohydrate; Tosic Acid Monohydrate; 4-Toluenesulfonic Acid Hydrate; PTSA Monohydrate; TsOH·H2O; para-Toluenesulfonic Acid Monohydrate
EINECS	203-180-0

Quality Control

Our p-Toluenesulfonic Acid Monohydrate is manufactured under strict quality management systems. Every batch undergoes rigorous analytical testing to ensure it meets precise specifications for purity, identity, and performance. A comprehensive Certificate of Analysis (COA) detailing assay, impurity profile, and physical properties is provided with each shipment to guarantee consistency and support your quality assurance protocols.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (15-25°C). This product is hygroscopic (moisture-sensitive) and should be kept in its original packaging or a suitable moisture-proof container to prevent caking and degradation. Keep away from strong bases and oxidizing agents.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms
Assay (Titration)	≥ 98.0 %
Water Content (KF)	8.0 - 10.0 %
Melting Point	103 - 107 °C
Sulfated Ash	≤ 0.1 %
Heavy Metals (as Pb)	≤ 10 ppm

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.