Description

4-Amino-4'-Benzamidostilbene-2,2'-Disulfonic Acid, Disodium Salt is a high-purity, water-soluble organic intermediate characterized by its stilbene backbone and sulfonic acid groups. This compound matters for its role as a critical building block in the synthesis of optical brighteners, fluorescent whitening agents, and specialty dyes. It is primarily needed by manufacturers in the textile, paper, detergent, and polymer industries seeking to enhance product brightness and whiteness.

Application

• Optical Brightening Agent (OBA) Synthesis: A key precursor for manufacturing stilbene-based fluorescent whitening agents used in laundry detergents and fabric softeners.
• Textile & Fiber Processing: Used in the production of brighteners applied to cotton, nylon, and other synthetic fibers to improve perceived whiteness and brightness.
• Paper Manufacturing: Employed in the synthesis of additives for high-quality paper and board to achieve superior optical brightness.
• Polymer & Plastics Industry: Acts as an intermediate for light-stabilizing agents and brighteners incorporated into various plastic formulations.
• Specialty Dye & Pigment Production: Serves as a starting material for creating water-soluble, anionic dyes with specific color-fastness properties.
• Research & Development: Utilized in chemical research for developing new fluorescent probes, sensors, and advanced organic materials.

Basic Information

Product Name	4-Amino-4'-Benzamidostilbene-2,2'-Disulfonic Acid, Disodium Salt
CAS No.	40301-06-2
Molecular Formula	C21H16N2Na2O7S2
Molecular Weight	526.46 g/mol
Synonyms	4,4'-Bis(benzoylamino)-2,2'-stilbenedisulfonic Acid Disodium Salt; 4-Amino-4'-(benzoylamino)-2,2'-stilbenedisulfonic Acid Disodium Salt; Disodium 4,4'-bis(benzamido)stilbene-2,2'-disulfonate; DAS 1 (common industry abbreviation); Fluorescent Brightener Intermediate; Stilbene Disulfonic Acid Derivative; Benzenesulfonic acid, 4,4'-(1,2-ethenediyl)bis[6-(benzoylamino)-, disodium salt; 4,4'-Dibenzamidostilbene-2,2'-disulfonic Acid Disodium Salt
EINECS	254-879-5

Quality Control

Our 4-Amino-4'-Benzamidostilbene-2,2'-Disulfonic Acid, Disodium Salt is produced under a strict quality management system. Every batch undergoes rigorous analytical testing to ensure consistent purity and performance. Certificates of Analysis (COA) detailing assay, impurity profile, and physical specifications are provided to guarantee compliance with your application requirements.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at a controlled room temperature (15-25°C). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept tightly sealed to prevent absorption of atmospheric moisture.

Specification

Item	Specification
Appearance	Yellow to light brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Water Content	≤ 5.0%
pH (1% Solution)	6.0 - 8.0
Heavy Metals (as Pb)	≤ 20 ppm
Solubility	Freely soluble in water

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