Description

Disodium Hydrogen Sulphonatophthalate CAS NO 51821-29-5 is a high-purity, water-soluble organic salt derived from phthalic acid. This compound serves as a critical intermediate and functional additive in advanced chemical synthesis and specialty material production. It is essential for manufacturers in the pharmaceutical, dye, and fine chemical industries seeking reliable, high-quality raw materials for sensitive processes.

Application

• Pharmaceutical Intermediate: A key building block in the synthesis of active pharmaceutical ingredients (APIs) and diagnostic agents.
• Dye and Pigment Manufacturing: Used as a precursor or solubilizing agent in the production of sulfonated dyes and colorants.
• Analytical Chemistry: Employed as a standard or reagent in chromatographic analysis and biochemical assays.
• Fine Chemical Synthesis: Acts as a versatile intermediate for creating specialty chemicals with sulfonate functionality.
• Polymer Modification: Can be used to introduce hydrophilic sulfonate groups into polymer chains to alter material properties.
• Research & Development: Serves as a valuable compound in academic and industrial R&D for exploring new chemical entities and applications.

Basic Information

Product Name	Disodium Hydrogen Sulphonatophthalate
CAS No.	51821-29-5
Molecular Formula	C8H5Na2O7S
Molecular Weight	290.16 g/mol
Synonyms	Disodium 2-Sulfoterephthalate; 2-Sulfoterephthalic Acid Disodium Salt; Disodium 2-Sulfobenzene-1,4-dicarboxylate; 1,4-Benzenedicarboxylic Acid, 2-Sulfo-, Disodium Salt; Disodium Hydrogen 2-Sulfoterephthalate; DHSP; Sulphoterephthalic Acid Disodium Salt
EINECS	257-418-5

Quality Control

Our Disodium Hydrogen Sulphonatophthalate is manufactured under a stringent quality management system. Each batch is subjected to comprehensive analytical testing, including HPLC and titration methods, to ensure high purity and batch-to-batch consistency. Certificates of Analysis (COA) detailing all 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, and well-ventilated area at room temperature (15-25°C). This product is hygroscopic (moisture-sensitive); the container must be kept tightly sealed to prevent absorption of atmospheric moisture, which can affect product quality and handling properties.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to reference spectrum
Assay (HPLC)	≥ 98.0%
Water Content (KF)	≤ 2.0%
pH (5% Solution)	6.0 - 8.0
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.