132-57-0 Usage
Description
7-hydroxynaphthalene-1-sulphonic acid is a sulfonic acid derivative of naphthalene, a polycyclic aromatic hydrocarbon, commonly used in the production of dyes, pigments, fluorescent whitening agents, optical brighteners, and as a pH indicator and reagent in chemical analysis.
Uses
Used in Dye and Pigment Production:
7-hydroxynaphthalene-1-sulphonic acid is used as a dye intermediate for the production of textiles, paper, and leather due to its water-soluble property.
Used in Fluorescent Whitening Agents and Optical Brighteners Manufacturing:
7-hydroxynaphthalene-1-sulphonic acid is used as a key component in the manufacturing of fluorescent whitening agents and optical brighteners, contributing to their effectiveness in various applications.
Used in Chemical Analysis:
7-hydroxynaphthalene-1-sulphonic acid is used as a pH indicator and reagent in chemical analysis, aiding in the accurate determination of pH levels and other analytical processes.
Used in Various Industries:
7-hydroxynaphthalene-1-sulphonic acid is an important component in various industries, including textiles, paper, leather, and chemical manufacturing, due to its versatile properties and applications.
Check Digit Verification of cas no
The CAS Registry Mumber 132-57-0 includes 6 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 3 digits, 1,3 and 2 respectively; the second part has 2 digits, 5 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 132-57:
(5*1)+(4*3)+(3*2)+(2*5)+(1*7)=40
40 % 10 = 0
So 132-57-0 is a valid CAS Registry Number.
InChI:InChI=1/C10H8O4S/c11-8-5-4-7-2-1-3-10(9(7)6-8)15(12,13)14/h1-6,11H,(H,12,13,14)
132-57-0Relevant articles and documents
Process for aryl-quinone and aryl-naphthoquinone diazide sulfonic acids
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, (2008/06/13)
A process for the preparation of aryl-diazide-sulfonic acids by a series of sequential in-situ process steps. The process comprises the nitrosation of a hydroxyarylsulfonic acid; conversion of the nitroso-derivative to a sulfamate which is then diazotized to the diazide. Temperature and pH are maintained in predetermined ranges to maintain the reaction products in solution without the formation side-products or the need to isolate intermediates. The process of the invention is particularly useful in the preparation of light-sensitive materials such as naphthoquinonediazide sulfonic acids which are used in the preparation of photoresist compositions. The invention provides a high purity product at a high material efficiency, high equipment utilization, low effluent discharge, and reduced cost.
Barium laked phenylazonaphthalene dye containing sulfonic acid groups
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, (2008/06/13)
Azo dyes containing sulfonic acid groups laked with barium and derived from an anilinesulfonic acid as diazo component and a β-naphtholsulfonic acid as coupling component for example a dye of the formula STR1 The dyes are eminently suitable as pigments for coloring surface coating compositions, printing inks and particlarly resins.
