Description

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

Application

• Catalyst for Esterification and Transesterification: Key in producing plasticizers, biodiesel, and fragrance esters.
• Acid Catalyst in Organic Synthesis: Used in Friedel-Crafts alkylation, Pechmann condensation, and the synthesis of resins like phenolic and urea-formaldehyde.
• Pharmaceutical Intermediate: Employed in the synthesis of various active pharmaceutical ingredients (APIs) and fine chemicals.
• Crosslinking Agent & Curing Agent: Facilitates the curing of epoxy resins and other polymer systems.
• Dye and Pigment Manufacturing: Acts as a sulfonating agent and catalyst in the production process.
• Electroplating Additive: Used in electroplating baths to improve finish quality and process efficiency.

Basic Information

Product Name	p-Toluenesulfonic Acid
CAS No.	104-15-4
Molecular Formula	C7H8O3S
Molecular Weight	172.20 g/mol
Synonyms	4-Methylbenzenesulfonic acid; Tosic acid; PTSA; Toluenesulfonic acid; p-Toluenesulphonic acid; 4-Toluenesulfonic acid; Toluene-4-sulfonic acid; p-Toluolsulfonsäure
EINECS	203-180-0

Quality Control

Our p-Toluenesulfonic Acid is manufactured under strict quality management systems. Each batch undergoes comprehensive analytical testing to ensure it meets precise specifications for purity, acidity, and impurity profiles. Certificates of Analysis (COA) documenting results for assay, water content, sulfated ash, and related substances are provided to guarantee consistent quality and batch-to-batch reliability for your critical processes.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area. Due to its hygroscopic (moisture-sensitive) nature, the container must be kept tightly sealed after opening to prevent absorption of atmospheric moisture. Keep away from strong bases and oxidizing agents.

Specification

Item	Specification
Appearance	White to off-white crystals or powder
Identification (IR)	Conforms
Assay (Titration)	≥ 98.5 %
Water (KF)	≤ 1.0 %
Sulfated Ash	≤ 0.1 %
Melting Point	103 - 107 °C

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