Description

2,2'-Thiobis(5-Aminobenzenesulphonic) Acid is a specialized aromatic sulfonic acid derivative containing both amino and sulfonic acid functional groups, connected by a thioether bridge. This unique structure makes it a valuable intermediate for synthesizing high-performance dyes, pigments, and optical brighteners. It is primarily sought after by manufacturers in the fine chemical, specialty dye, and polymer industries for creating products with enhanced color fastness and functional properties.

Application

• Key Intermediate for Optical Brighteners (OBA/FWA): A critical building block in the synthesis of stilbene-based fluorescent whitening agents used in paper, textiles, and detergents.
• Specialty Dye and Pigment Synthesis: Serves as a precursor for azo dyes and other complex colorants requiring high purity and specific sulfonation.
• Polymer Modification: Used to introduce sulfonic acid groups into polymers, enhancing properties like hydrophilicity or ion-exchange capacity.
• Chemical Research & Development: Employed in R&D for creating novel compounds with specific electronic or photochemical characteristics.
• Cross-linking Agent: Potential use in creating cross-linked polymeric networks due to its bifunctional structure.

Basic Information

Product Name	2,2'-Thiobis(5-Aminobenzenesulphonic) Acid
CAS No.	118-86-5
Molecular Formula	C12H12N2O6S3
Molecular Weight	376.43 g/mol
Synonyms	4,4'-Diaminodiphenyl Disulfide-2,2'-disulfonic Acid; 2,2'-Dithiobis(5-aminobenzenesulfonic acid); Bis(2-amino-5-sulfophenyl) Disulfide; 5,5'-Dithiobis(2-aminobenzenesulfonic Acid); DADS (Disulfonic Acid Derivative); 4,4'-Dithiodianiline-2,2'-disulfonic Acid; 2-Amino-5-sulfophenyldisulfide; 118-86-5
EINECS	204-284-9

Quality Control

Our production of 2,2'-Thiobis(5-Aminobenzenesulphonic) Acid adheres to stringent quality management protocols. Every batch undergoes comprehensive analytical testing, including HPLC for purity and identity confirmation, to ensure it meets precise customer specifications. A Certificate of Analysis (COA) detailing assay, impurity profile, and physical characteristics is provided with each shipment to guarantee traceability and consistency for your critical applications.

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 compound is hygroscopic (moisture-sensitive) and should be kept under dry conditions to prevent caking or degradation.

Specification

Item	Specification
Appearance	Light yellow to beige powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Loss on Drying	≤ 2.0%
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.