Description

2,2'-[(1,8-Dihydroxy-3,6-Disulfo-2,7-Naphthalenediyl)Bis(Azo)]Bis-Benzoic Acid is a high-purity, water-soluble azo dye intermediate of significant industrial importance. Its core value lies in its precise molecular structure, which serves as a critical building block for synthesizing specialized dyes and pigments with excellent color fastness and stability. This compound is essential for manufacturers in the textile, ink, and specialty chemical industries seeking to produce vibrant, high-performance colorants.

Application

• Primary Intermediate for Azo Dyes: Key precursor in the synthesis of acid dyes, direct dyes, and reactive dyes used for coloring wool, silk, nylon, and paper.
• Textile Industry: Manufacture of dyes for textile fibers requiring bright shades and good wet-fastness properties.
• Ink Formulation: Used in the production of pigments for inks in printing and packaging applications.
• Biological Staining: Potential use as a staining agent or intermediate in histological and cytological applications due to its chromophoric structure.
• Research & Development: Serves as a standard or starting material in chemical research for developing new chromophores and functional materials.
• Specialty Chemical Synthesis: Building block for creating metal-complex dyes and other advanced functional chemicals.

Basic Information

Product Name	2,2'-[(1,8-Dihydroxy-3,6-Disulfo-2,7-Naphthalenediyl)Bis(Azo)]Bis-Benzoic Acid
CAS No.	7451-57-2
Molecular Formula	C30H18N4O14S2
Molecular Weight	722.62 g/mol
Synonyms	Acid Black 1 Precursor; 2,2'-[(1,8-Dihydroxy-3,6-disulfo-2,7-naphthalene)bis(azo)]dibenzoic Acid; Naphthol Blue Black Precursor; Azo Dye Intermediate 7451-57-2; 1,8-Dihydroxy-3,6-disulfo-2,7-bis(2-carboxyphenylazo)naphthalene; C.I. 20470 Intermediate; Benzoic acid, 2,2'-[(1,8-dihydroxy-3,6-disulfo-2,7-naphthalenediyl)bis(azo)]bis-
EINECS	Contact for details

Quality Control

Our production of 2,2'-[(1,8-Dihydroxy-3,6-Disulfo-2,7-Naphthalenediyl)Bis(Azo)]Bis-Benzoic Acid adheres to stringent quality management protocols. Every batch undergoes rigorous analytical testing, including HPLC for purity and identity confirmation, to ensure consistency and compliance with customer specifications. Certificates of Analysis (COA) detailing batch-specific results 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). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept tightly sealed after each use to prevent absorption of atmospheric moisture, which can affect product quality and handling.

Specification

Item	Specification
Appearance	Dark Brown to Black Powder
Identification (IR)	Conforms to Structure
Assay (HPLC)	≥ 95.0%
Water Content (KF)	≤ 5.0%
Sulfated Ash	≤ 1.0%
Heavy Metals (as Pb)	≤ 20 ppm
Solubility (1% in Water)	Complete, clear solution

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