Description

4-Methylbenzenesulfonic Acid is a versatile organic sulfonic acid widely used as a catalyst and intermediate in chemical synthesis. Its strong acidic properties and solubility in various organic solvents make it a valuable reagent for esterification, alkylation, and polymerization reactions. This compound is essential for manufacturers in the pharmaceutical, agrochemical, polymer, and specialty chemical industries seeking efficient and reliable acid catalysts.

Application

• Chemical Synthesis Catalyst: Employed as a highly effective acid catalyst for esterification, Friedel-Crafts alkylation, and condensation reactions.
• Pharmaceutical Intermediate: Serves as a key building block in the synthesis of various active pharmaceutical ingredients (APIs) and fine chemicals.
• Polymer Industry: Used as a curing agent for epoxy resins and a catalyst in the production of phenolic resins and other polymers.
• Dye and Pigment Manufacturing: Acts as an intermediate and sulfonating agent in the production of dyes, pigments, and optical brighteners.
• Electroplating Additives: Utilized in electroplating baths and surface treatment formulations.
• Research & Development: A standard reagent in organic chemistry laboratories for method development and scale-up studies.

Basic Information

Product Name	4-Methylbenzenesulfonic Acid
CAS No.	4846-75-7
Molecular Formula	C7H8O3S
Molecular Weight	172.20 g/mol
Synonyms	p-Toluenesulfonic Acid; Tosic Acid; PTSA; 4-Toluenesulfonic Acid; Toluenesulfonic Acid; p-Toluene Sulfonic Acid; p-Methylbenzenesulfonic Acid; 4-Methylbenzenesulfonic Acid Monohydrate (common form)
EINECS	225-408-0

Quality Control

Our 4-Methylbenzenesulfonic Acid is manufactured under a strict quality management system. Each batch is tested to ensure it meets high-purity standards suitable for industrial and fine chemical applications. A comprehensive Certificate of Analysis (COA) detailing purity, assay, and impurity profiles is provided with every shipment to guarantee consistent quality and traceability.

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). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept tightly sealed to prevent absorption of atmospheric moisture. Keep away from incompatible materials such as 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)	≤ 1.0%
Melting Point	103 - 107 °C
Heavy Metals (as Pb)	≤ 10 ppm
Sulfated Ash	≤ 0.1%

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