Description

Sodium 4,4'-Dinitrostilbene-2,2'-Disulphonate is a high-purity, water-soluble organic intermediate of significant commercial importance. This compound serves as a critical precursor in the synthesis of optical brighteners and fluorescent whitening agents (FWAs) for the paper, textile, and detergent industries. Industrial manufacturers and chemical synthesis specialists rely on its consistent quality and reactivity to produce high-performance additives that enhance product brightness and whiteness. Its disulfonate groups ensure excellent solubility in aqueous systems, facilitating downstream processing.

Application

• Primary Intermediate for Optical Brightening Agents (OBAs): The key starting material for synthesizing stilbene-based fluorescent whitening agents, such as those used in laundry detergents and fabric softeners.
• Paper Industry Brightener: Used in the manufacture of FWAs applied to high-quality papers, including printing, writing, and tissue grades, to achieve superior whiteness and opacity.
• Textile and Fiber Treatment: Incorporated into formulations for brightening synthetic fibers like polyamide and polyester, as well as cotton blends during finishing processes.
• Plastics and Polymer Additive: Employed as a monomer or additive precursor to impart fluorescence and whiteness to certain plastic materials.
• Research & Development: Serves as a valuable building block in organic synthesis for developing new dyes, pigments, and specialty chemicals with unique optical properties.
• Liquid Detergent Formulations: Its excellent water solubility makes it particularly suitable for use in the synthesis of brighteners for liquid laundry and dishwashing detergents.

Basic Information

Product Name	Sodium 4,4'-Dinitrostilbene-2,2'-Disulphonate
CAS No.	15883-59-7
Molecular Formula	C14H8N2Na2O10S2
Molecular Weight	490.32 g/mol
Synonyms	4,4'-Dinitrostilbene-2,2'-disulfonic acid disodium salt; Dinitrostilbenedisulfonic Acid Sodium Salt; Sodium Dinitrostilbenedisulfonate; DNS-Na; DSD Acid Disodium Salt; 2,2'-(1,2-Ethenediyl)bis[5-nitrobenzenesulfonic acid] disodium salt; Tinopal® CBS-X (related derivative); Fluorescent Brightener 351 (related derivative)
EINECS	240-024-6

Quality Control

Our Sodium 4,4'-Dinitrostilbene-2,2'-Disulphonate is manufactured under a strict quality management system. Every batch undergoes rigorous analytical testing to ensure it meets precise specifications for purity, color, and solubility, which are critical for consistent performance in downstream synthesis. Certificates of Analysis (COA) documenting key parameters are available upon request to support your quality assurance and regulatory compliance needs.

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 light-sensitive (store away from light) and hygroscopic (moisture-sensitive). Keep away from strong oxidizing agents.

Specification

Item	Specification
Appearance	Yellow to orange-yellow powder or crystalline powder
Identification (IR)	Conforms to standard
Assay (HPLC)	≥ 98.0%
Water Solubility	Clear solution at 1% w/v
Loss on Drying	≤ 2.0%
Sulfated Ash	22.0% - 26.0%
Heavy Metals (as Pb)	≤ 20 ppm
Related Substances (HPLC)	Total impurities ≤ 2.0%

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