Description

2-Methylbenzenesulfonic Acid Hydrate is an important organic sulfonic acid derivative, widely utilized as a versatile acid catalyst and intermediate in fine chemical synthesis. Its value lies in providing a strong, water-soluble acidic environment for various organic transformations, offering advantages in reaction efficiency and work-up procedures. This compound is essential for manufacturers in the pharmaceutical, agrochemical, and specialty chemical industries, where it facilitates key synthetic steps such as esterification, alkylation, and resin curing.

Application

• Pharmaceutical Intermediate: Acts as a key building block and acid catalyst in the synthesis of active pharmaceutical ingredients (APIs).
• Polymer & Resin Production: Serves as a curing agent and catalyst in the manufacture of phenolic resins, epoxy resins, and other thermosetting polymers.
• Dye & Pigment Synthesis: Used as a sulfonating and coupling agent in the production of various organic dyes and colorants.
• Electroplating Additive: Functions as a brightening agent and conductivity enhancer in electroplating baths.
• Chemical Synthesis Catalyst: Employed as an efficient acid catalyst for esterification, Friedel-Crafts alkylation, and other acid-promoted organic reactions.
• Surfactant & Detergent Precursor: Utilized as an intermediate in the manufacture of specialized anionic surfactants.

Basic Information

Product Name	2-Methylbenzenesulfonic Acid Hydrate
CAS No.	1914148-59-6
Molecular Formula	C7H8O3S • xH2O
Molecular Weight	172.20 (Anhydrous basis)
Synonyms	o-Toluenesulfonic Acid Monohydrate; 2-Toluenesulfonic Acid Hydrate; ortho-Toluene Sulfonic Acid Hydrate; Tosic Acid Hydrate; p-TSA Hydrate (common misnomer); Benzenesulfonic acid, 2-methyl-, hydrate; OTSA Hydrate; 2-Methylbenzene-1-sulfonic acid hydrate
EINECS	Contact for details

Quality Control

Our 2-Methylbenzenesulfonic Acid Hydrate is produced under a strict quality management system. Each batch undergoes rigorous analytical testing to ensure it meets precise specifications for purity, identity, and consistency. Certificates of Analysis (COA) documenting key parameters such as assay, water content, and impurity profile are available for every shipment, providing full traceability and quality assurance for your critical processes.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at a controlled room temperature (15-25°C). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept tightly sealed after opening to prevent absorption of atmospheric moisture, which can affect product quality and handling properties.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to standard
Assay (Titration)	≥ 98.0% (on anhydrous basis)
Water Content (KF)	5.0% - 10.0%
Melting Point	100 - 108 °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.