Description

4-Methylbenzenesulfonic Acid is a versatile organic sulfonic acid derivative, widely recognized for its strong acidity and utility as a catalyst and reagent in organic synthesis. Its value lies in its effectiveness as a soluble, non-oxidizing acid catalyst, offering advantages over traditional mineral acids in many processes. This compound is essential for manufacturers and R&D teams in the pharmaceutical, agrochemical, and specialty chemical industries.

Application

• Catalyst in Organic Synthesis: Widely used as a Brønsted acid catalyst for esterification, alkylation, and condensation reactions.
• Pharmaceutical Intermediate: Serves as a key building block in the synthesis of active pharmaceutical ingredients (APIs) and fine chemicals.
• Polymer Industry: Employed as a curing agent for epoxy resins and in the production of specialty polymers and ion-exchange resins.
• Dye and Pigment Manufacturing: Acts as a sulfonating agent and intermediate in the synthesis of various dyes and colorants.
• Electroplating Additives: Used in electroplating baths and surface treatment formulations.
• Research & Development: A valuable reagent for academic and industrial research in synthetic chemistry.

Basic Information

Product Name	4-Methylbenzenesulfonic Acid
CAS No.	2096496-06-7
Molecular Formula	C7H8O3S
Molecular Weight	172.20 g/mol
Synonyms	p-Toluenesulfonic Acid; Tosic Acid; PTSA; 4-Toluenesulfonic Acid; p-Toluene Sulfonic Acid; Toluenesulfonic Acid; p-Methylbenzenesulfonic Acid; 4-Methylbenzenesulfonic Acid Monohydrate (common form)
EINECS	Contact for details

Quality Control

Our 4-Methylbenzenesulfonic Acid is manufactured under strict quality management systems. Each batch undergoes rigorous analytical testing 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, well-ventilated area at room temperature (15-25°C). This product is hygroscopic (moisture-sensitive) and a strong acid/organic solvent; ensure containers are kept tightly sealed to prevent absorption of atmospheric moisture and contamination.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms
Assay (Titration)	≥ 98.0%
Water Content (KF)	≤ 1.0%
Residue on Ignition	≤ 0.1%
Heavy Metals (as Pb)	≤ 20 ppm

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