Description

2-Sulfoterephthalic Acid Monosodium Salt is a functionalized aromatic dicarboxylate salt, serving as a key intermediate and monomer in advanced polymer synthesis. Its value lies in the introduction of a sulfonate group onto the terephthalate backbone, imparting water solubility, ionic character, and enhanced reactivity for specialized applications. This compound is essential for manufacturers and R&D teams in the polymer, specialty chemical, and pharmaceutical industries seeking to develop products with tailored properties.

Application

• Polymer Modification: As a comonomer for producing sulfonated polyesters and polyamides, enhancing dyeability, moisture management, and antistatic properties in fibers and films.
• Water-Soluble Polymers: A critical building block for synthesizing high-performance, water-soluble resins used in coatings, dispersants, and flocculants.
• Ion-Exchange Materials: Serves as a precursor for manufacturing membranes and resins with cation-exchange capabilities for water treatment and separation technologies.
• Pharmaceutical Intermediates: Used in the synthesis of active pharmaceutical ingredients (APIs) and diagnostic agents that require a sulfonated aromatic moiety.
• Liquid Crystal Polymers (LCPs): A functional monomer for creating sulfonated LCPs with unique optical and electronic properties.
• Metal Chelation & Catalysis: The sulfonate and carboxylate groups make it a useful ligand for metal complexation in catalytic systems and metal recovery processes.
• Research & Development: A valuable reagent for academic and industrial R&D in organic synthesis and materials science.

Basic Information

Product Name	2-Sulfoterephthalic Acid Monosodium Salt
CAS No.	19089-60-2
Molecular Formula	C8H5NaO7S
Molecular Weight	268.17 g/mol
Synonyms	Monosodium 2-Sulfoterephthalate; Sodium 2-Sulfoterephthalate; 2-Sulfoterephthalic Acid Sodium Salt; 4-Sulfoisophthalic Acid Monosodium Salt (common isomer name); 5-Sulfoisophthalic Acid Sodium Salt; Terephthalic Acid-2-sulfonic Acid Sodium Salt; 2-Carboxy-5-sulfobenzoic Acid Monosodium Salt; STAMS
EINECS	242-842-9

Quality Control

Our 2-Sulfoterephthalic Acid Monosodium Salt is produced under a strict quality management system. Each batch undergoes comprehensive analytical testing, including HPLC for purity and identity confirmation, to ensure it meets precise specifications for your application. A Certificate of Analysis (COA) detailing all test results is provided with every shipment to guarantee traceability and compliance.

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 tightly sealed after opening to prevent absorption of atmospheric moisture.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Water Content (KF)	≤ 2.0%
pH (5% solution)	3.0 - 5.0
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.