Description

3-Hydroxy-4-Sulfobenzoic Acid is a versatile aromatic sulfonic acid derivative that serves as a key intermediate in the synthesis of more complex organic molecules. Its bifunctional structure, featuring both a phenolic hydroxyl and a sulfonic acid group, makes it valuable for introducing water-solubilizing and metal-chelating properties into target compounds. This chemical is primarily sought by manufacturers in the pharmaceutical, dye, and specialty chemical industries for producing active ingredients, colorants, and functional additives.

Application

• Pharmaceutical Intermediate: A crucial building block for synthesizing active pharmaceutical ingredients (APIs), particularly those requiring enhanced solubility or specific ionic characteristics.
• Dye and Pigment Manufacturing: Used in the production of acid dyes, reactive dyes, and organic pigments, where the sulfonic acid group improves affinity for textile fibers.
• Complexing Agent: Acts as a ligand or chelating agent in formulations for water treatment, metal finishing, and as a component in analytical chemistry reagents.
• Polymer Modification: Incorporated into polymer chains to impart hydrophilicity, ion-exchange capacity, or to create functional sites for further chemical reactions.
• Research & Development: Serves as a standard or starting material in organic synthesis and chemical research within academic and industrial laboratories.
• Specialty Surfactants: Can be used to synthesize anionic surfactants with specific dispersing or emulsifying properties for niche industrial applications.

Basic Information

Item	Details
Product Name	3-Hydroxy-4-Sulfobenzoic Acid
CAS No.	88122-95-6
Molecular Formula	C7H6O6S
Molecular Weight	218.18 g/mol
Synonyms	4-Sulfo-3-hydroxybenzoic Acid; 3-Hydroxybenzoic-4-sulfonic Acid; Benzoic acid, 3-hydroxy-4-sulfo-; 3-Carboxy-6-hydroxybenzenesulfonic Acid; 3-Hydroxy-4-sulfobenzoic acid; 3-Hydroxy-4-sulphobenzoic acid; 4-Carboxy-2-hydroxybenzenesulfonic Acid
EINECS	Contact for details

Quality Control

Our 3-Hydroxy-4-Sulfobenzoic Acid is manufactured under a strict quality management system. Each batch undergoes comprehensive analytical testing to ensure identity, purity, and consistency. We provide a Certificate of Analysis (COA) with key parameters including assay, impurity profile, and physical characteristics. Our quality commitment aligns with cGMP principles for pharmaceutical intermediates, ensuring reliable supply and traceability for critical applications.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated place at room temperature (15-25°C). Due to its hygroscopic nature, the container must be kept tightly sealed after opening to minimize exposure to atmospheric moisture. Keep away from incompatible materials such as strong oxidizing agents.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Loss on Drying	≤ 2.0%
Residue on Ignition	≤ 0.1%
Heavy Metals (as Pb)	≤ 20 ppm
Related Substances (HPLC)	Individual impurity ≤ 0.5%; Total impurities ≤ 1.5%

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