Description

Sulfanilic Acid, Monohydrate is the monohydrate form of 4-aminobenzenesulfonic acid, a key aromatic sulfonic acid derivative. This compound serves as a fundamental building block and coupling agent in the synthesis of azo dyes and pigments, providing essential sulfonate groups for solubility and color fastness. It is critical for manufacturers in the dyestuff, pharmaceutical, and analytical reagent industries, where consistent purity and reliable supply are paramount.

Application

• Azo Dye & Pigment Manufacturing: Primary intermediate for synthesizing acid, direct, and reactive dyes, providing the sulfonic acid functionality.
• Pharmaceutical Synthesis: Used as a precursor in the production of certain sulfa drugs and other active pharmaceutical ingredients (APIs).
• Analytical Chemistry: Essential reagent in the Griess test for the spectrophotometric determination of nitrite and nitrate ions.
• Chemical Intermediate: Building block for surfactants, optical brighteners, and other specialty chemicals.
• Corrosion Inhibitor Formulation: Component in certain industrial water treatment and metalworking fluid formulations.
• Research & Development: Used in laboratory-scale organic synthesis and biochemical research.

Basic Information

Item	Detail
Product Name	Sulfanilic Acid, Monohydrate
CAS No.	6101-32-2
Molecular Formula	C6H7NO3S · H2O
Molecular Weight	191.20 g/mol
Synonyms	4-Aminobenzenesulfonic Acid Monohydrate; Aniline-4-sulfonic Acid Monohydrate; p-Aminobenzenesulfonic Acid Monohydrate; Sulphanilic Acid Monohydrate; 4-Sulfoaniline Monohydrate; Benzenesulfonic acid, 4-amino-, monohydrate; p-Anilinesulfonic Acid Monohydrate
EINECS	Contact for details

Quality Control

Our Sulfanilic Acid, Monohydrate is produced under a stringent quality management system. Each batch undergoes comprehensive analytical testing to ensure it meets high-purity standards suitable for industrial and fine chemical applications. We provide traceable Certificates of Analysis (COA) with key parameters including assay, loss on drying, and impurity profiles. Specifications can be aligned with customer requirements for specific applications.

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 material is hygroscopic (moisture-sensitive); keep the container tightly sealed to prevent absorption of atmospheric moisture.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms
Assay (Titration)	≥ 98.0 %
Loss on Drying	8.0 - 10.0 %
Water Insoluble Matter	≤ 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.