Description

2,2'-Benzidinedisulfonic Acid is a key aromatic sulfonic acid derivative and an important intermediate in the synthesis of dyes and pigments. This compound matters for its role in producing high-value, color-fast azo dyes and for its utility in other specialized chemical syntheses. It is primarily needed by manufacturers in the dye and pigment industry, as well as by research institutions and chemical companies developing advanced organic materials.

Application

• Primary intermediate in the manufacture of azo dyes and pigments, particularly direct and acid dyes for textiles and paper.
• Key starting material for synthesizing optical brightening agents and fluorescent whitening compounds.
• Used in research and development of specialty polymers and functional materials.
• Potential intermediate for pharmaceutical and agrochemical active ingredient synthesis.
• Employed in analytical chemistry as a reagent or standard.
• Used in the production of liquid crystal materials and other advanced electronic chemicals.

Basic Information

Product Name	2,2'-Benzidinedisulfonic Acid
CAS No.	117-61-3
Molecular Formula	C12H10N2O6S2
Molecular Weight	342.35 g/mol
Synonyms	3,3'-Diaminobiphenyl-4,4'-disulfonic Acid; o-Dianisidine Disulfonic Acid; 4,4'-Diamino-3,3'-biphenyldisulfonic Acid; Benzidine-2,2'-disulfonic Acid; [1,1'-Biphenyl]-4,4'-disulfonic Acid, 3,3'-Diamino-; C.I. 37240; Direct Blue 2 Intermediate
EINECS	204-203-6

Quality Control

Our 2,2'-Benzidinedisulfonic Acid is manufactured under a strict quality management system. Each batch undergoes comprehensive analytical testing to ensure it meets precise chemical and physical specifications. Certificates of Analysis (COA) detailing purity, assay, and impurity profiles are available upon request to support your quality assurance and regulatory 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). Keep away from strong oxidizing agents and incompatible materials.

Specification

Item	Specification
Appearance	Off-white to light gray powder or crystals
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Loss on Drying	≤ 1.0%
Sulfated Ash	≤ 0.5%
Heavy Metals (as Pb)	≤ 20 ppm

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