Description

4-Sulfophthalic Acid, Trisodium Salt is a versatile, water-soluble aromatic sulfonate derivative. This compound serves as a key intermediate and functional additive, valued for its ability to introduce sulfonate groups and modify solubility and ionic character in various chemical systems. It is essential for manufacturers and R&D teams in the dye and pigment, polymer, and specialty chemical industries seeking to develop or enhance product performance.

Application

• Dye and Pigment Intermediate: A crucial building block for synthesizing sulfonated azo dyes and pigments, improving their water solubility and fiber affinity.
• Polymer Modification: Used to incorporate anionic character into polymers for applications such as dispersants, ion-exchange resins, and water-treatment chemicals.
• Electroplating Additive: Functions as a brightener and leveling agent in electroplating baths to improve the quality and uniformity of metal deposits.
• Catalyst and Ligand Synthesis: Serves as a precursor for creating sulfonated ligands used in homogeneous catalysis and metal complexation.
• Analytical Reagent: Employed in certain analytical chemistry methods and as a standard or buffer component.
• Research & Development: A valuable reagent for organic synthesis and material science research involving sulfonation chemistry.

Basic Information

Product Name	4-Sulfophthalic Acid, Trisodium Salt
CAS No.	3325-08-4
Molecular Formula	C8H4Na3O7S
Molecular Weight	328.15 g/mol
Synonyms	1,2-Benzenedicarboxylic acid, 4-sulfo-, trisodium salt; Trisodium 4-sulfophthalate; 4-Sulfophthalic acid trisodium salt; Sulfophthalic acid sodium salt; Benzenesulfophthalic acid trisodium salt; Phthalic acid, 4-sulfo-, trisodium salt; Trisodium sulfobenzene-1,2-dicarboxylate
EINECS	222-036-8

Quality Control

Our 4-Sulfophthalic Acid, Trisodium Salt is produced under a strict quality management system. Each batch undergoes comprehensive analytical testing to ensure consistent purity and performance. Certificates of Analysis (COA) detailing assay, impurity profiles, and physical specifications are provided and available upon request to support your quality assurance protocols.

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 to structure
Assay (Titration)	≥ 98.0%
Water Content (KF)	≤ 2.0%
pH (5% Solution)	7.0 - 9.0
Heavy Metals (as Pb)	≤ 20 ppm

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