6258-06-6Relevant articles and documents
Preparation process for sodium 1-amino-4-bromoanthraquinone-2-sulfonate
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Paragraph 0010, (2016/12/26)
The invention discloses a preparation process for sodium 1-amino-4-bromoanthraquinone-2-sulfonate. The preparation process comprises the following steps: (1) sulfonation: with 1-aminoanthraquinone as a raw material, copper sulfate as a catalyst and dichloroethane as a solvent, carrying out dehydration, then adding chlorosulfonic acid drop by drop for a sulfonation reaction, adding 98% concentrated sulfuric acid after completion of the reaction, extracting 1-aminoanthraquinone-2-sulfonic acid out, allowing 1-aminoanthraquinone-2-sulfonic acid to enter the concentrated sulfuric acid, separating out an acid phase at a lower layer and subjecting the acid phase to a subsequent reaction; (2) bromination: adding bromine into the concentrated sulfuric acid solution of 1-aminoanthraquinone-2-sulfonic acid drop by drop for a reaction so as to obtain the concentrated sulfuric acid solution of bromoamine acid; (3) dilution: adding water into the concentrated sulfuric acid solution of bromoamine acid for dilution and successively carrying out cooling, crystallization and filtering so as to obtain bromoamine acid; and (4) salt formation: adding water to dissolve bromoamine acid and adding sodium sulfite to obtain bromoamine acid sodium salt. The preparation process provided by the invention can reduce energy consumption during solvent recovery; the utilization rate of bromine in bromination is high; sodium sulfite is used for salt formation, so the amount of impurities is reduced; and product quality is high.
OPTIMIZATION OF THE OXIDATIVE BROMINATION OF 1-AMINOANTHRAQUINONE-2-SULFONIC ACID
Gerasimov, S. V.,Filimonov, V. D.
, p. 928 - 930 (2007/10/03)
An efficient method of synthesis of 1-amino-4-bromoanthraquinone-2-sulfonic acid using bromination of the corresponding aminoathraquinonesulfonic acid with bromine in the presence of hydrogen peroxide has been proposed.The optimum conditions of synthesis, with a yield of the target product of 68percent, have been found.