Description

Disodium 4,4'-Diaminostilbene-2,2'-Disulphonate is a high-purity, water-soluble organic intermediate with a distinctive stilbene backbone. This compound matters as a critical building block in the synthesis of optical brighteners and fluorescent whitening agents (FWAs), which are essential for enhancing the brightness and whiteness of materials. Industries such as paper manufacturing, textile processing, detergent formulation, and plastics production rely on this key intermediate to achieve superior product aesthetics and performance.

Application

• Primary Intermediate for Optical Brighteners (OBAs/FWAs): The core application is as a key precursor in the synthesis of diaminostilbene disulfonate (DSD)-based fluorescent whitening agents, widely used in detergents, papers, and textiles.
• Detergent & Laundry Care Industry: Incorporated into detergent formulations to impart a "whiter-than-white" appearance to fabrics by compensating for yellowing.
• Paper Manufacturing: Used in the production of high-brightness papers, including printing/writing grades and specialty papers, to improve optical properties.
• Textile & Fiber Treatment: Applied in the finishing process of natural and synthetic fibers (e.g., cotton, nylon) to enhance whiteness and brightness.
• Plastics and Polymer Industry: Acts as a whitening agent additive for polymers to improve the visual appeal of finished plastic products.
• Research & Chemical Synthesis: Serves as a valuable intermediate in organic chemistry research for developing new fluorescent dyes and functional materials.

Basic Information

Product Name	Disodium 4,4'-Diaminostilbene-2,2'-Disulphonate
CAS No.	7336-20-1
Molecular Formula	C14H12N2Na2O6S2
Molecular Weight	422.36 g/mol
Synonyms	4,4'-Diaminostilbene-2,2'-disulfonic acid disodium salt; DSD Acid Disodium Salt; Sodium 4,4'-diaminostilbene-2,2'-disulfonate; Disodium 4,4'-diamino-2,2'-stilbenedisulfonate; Tinopal DMS; Fluorescent Brightener DMS; Blankophor DMS; 2,2'-Stilbenedisulfonic acid, 4,4'-diamino-, disodium salt
EINECS	230-822-3

Quality Control

Our Disodium 4,4'-Diaminostilbene-2,2'-Disulphonate is manufactured under a strict quality management system. Each batch undergoes rigorous analytical testing, including HPLC for purity and identity confirmation, to ensure it meets precise specifications for use in high-performance applications. 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, and well-ventilated area at room temperature (15-25°C). This material is hygroscopic (moisture-sensitive); the container must be kept tightly sealed to prevent absorption of atmospheric moisture, which can affect product quality.

Specification

Item	Specification
Appearance	Yellow to light yellow crystalline powder
Identification (IR)	Conforms to standard
Assay (HPLC)	≥ 98.0%
Water Content (KF)	≤ 2.0%
pH (1% Aqueous Solution)	7.0 - 9.0
Sulfate Ash	≤ 0.5%

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