Description

4-Sulfophthalic Acid is a versatile aromatic sulfonic acid derivative, serving as a key intermediate in the synthesis of high-value specialty chemicals. Its bifunctional nature, containing both a sulfonic acid and two carboxylic acid groups, makes it a valuable building block for creating water-soluble polymers, dyes, and advanced materials. This compound is essential for manufacturers in the polymer, textile, and fine chemical industries seeking to develop products with enhanced solubility and ionic character.

Application

• Polymer Intermediate: A crucial monomer for the production of water-soluble and ion-exchange resins.
• Dye and Pigment Synthesis: Used in the manufacture of sulfonated dyes and colorants to improve water solubility and fiber affinity.
• Catalyst and Ligand Preparation: Serves as a precursor for sulfonated ligands used in homogeneous catalysis.
• Corrosion Inhibitor Formulation: Incorporated into coatings and treatment solutions for metal surface protection.
• Pharmaceutical Intermediate: Employed in the synthesis of certain active pharmaceutical ingredients (APIs) requiring sulfonic acid functionality.
• Research & Development: Used in academic and industrial R&D for developing new functional materials and chemical processes.

Basic Information

Product Name	4-Sulfophthalic Acid
CAS No.	89-08-7
Molecular Formula	C8H6O7S
Molecular Weight	246.19 g/mol
Synonyms	4-Sulfobenzoic-1,2-dicarboxylic Acid; 4-Sulfobenzene-1,2-dicarboxylic Acid; 1,2-Benzenedicarboxylic Acid, 4-Sulfo-; 4-Carboxyphthalic Acid-4-Sulfonic Acid; Phthalic Acid-4-Sulfonic Acid; 4-Sulfophthalic-1,2-dioic Acid; 4-Sulfophthalic Acid Monopotassium Salt (common derivative); SP Acid
EINECS	201-876-7

Quality Control

Our 4-Sulfophthalic Acid is produced under a stringent quality management system. Each batch undergoes comprehensive analytical testing to ensure consistent purity and performance, meeting the specifications required for industrial and research applications. A Certificate of Analysis (COA) detailing key parameters such as assay, impurity profile, and physical characteristics is provided with every shipment to guarantee supply reliability and product traceability.

Storage

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

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms
Assay (HPLC)	≥ 98.0%
Water Content (KF)	≤ 2.0%
Sulfate Ash	≤ 0.5%
Heavy Metals (as Pb)	≤ 20 ppm

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