Description

3-Sulphophthalic Acid is a specialized organic acid derivative, primarily serving as a key intermediate in the synthesis of advanced materials and fine chemicals. Its value lies in the introduction of a highly reactive sulphonic acid group onto the phthalic acid backbone, enabling unique solubility and functionalization properties. This compound is essential for manufacturers in the dye and pigment, polymer, and pharmaceutical intermediate industries seeking to develop products with enhanced performance characteristics.

Application

• Dye and Pigment Intermediate: A crucial building block for synthesizing sulfonated dyes, colorants, and optical brighteners, improving their water solubility and fiber affinity.
• Polymer Modification: Used to introduce sulfonate groups into polymer chains, such as polyesters or polyamides, to alter hydrophilicity, dyeability, and antistatic properties.
• Pharmaceutical Synthesis: Acts as a versatile intermediate in the production of certain active pharmaceutical ingredients (APIs) and diagnostic agents.
• Catalyst and Ligand Preparation: Serves as a precursor for creating metal-complexing agents and specialized acid catalysts used in organic synthesis.
• Surface Treatment Agent: Employed in formulations for metal surface treatment and electroplating baths to enhance coating uniformity and adhesion.
• Research & Development: A valuable reagent in chemical R&D for exploring new synthetic pathways and functional materials.

Basic Information

Product Name	3-Sulphophthalic Acid
CAS No.	67892-43-7
Molecular Formula	C8H6O7S
Molecular Weight	246.19 g/mol
Synonyms	3-Sulfophthalic Acid; 3-Sulfobenzoic-1,2-dicarboxylic Acid; Phthalic-3-sulfonic Acid; 1,2-Benzenedicarboxylic acid, 3-sulfo-; Benzoic acid, 3-sulfo-1,2-dicarboxy-; 3-Carboxy-4-sulfobenzoic acid
EINECS	Contact for details

Quality Control

Our 3-Sulphophthalic Acid is produced under a strict quality management system. Each batch undergoes rigorous analytical testing, including assay, impurity profiling, and identity confirmation, to ensure it meets precise specifications for industrial and research applications. A comprehensive Certificate of Analysis (COA) detailing purity, physical properties, and test results is provided with every shipment to guarantee traceability and consistency.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (15-25°C). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept sealed to prevent absorption of atmospheric moisture. Keep away from strong bases and incompatible materials.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Water Content (KF)	≤ 2.0%
Heavy Metals (as Pb)	≤ 20 ppm
Residue on Ignition	≤ 0.1%

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