Preparation method of reactive brilliant blue K-GR intermediate

Abstract

The invention provides a preparation method of a reactive brilliant blue K-GR intermediate. The preparation method comprises following steps: carrying out a condensation reaction between bromamine acid and 2,4-diaminobenzene sulfonic acid or sodium 2,4-diaminobenzene sulfonate with a catalyst system containing a cuprous complex for catalyzing the reaction to obtain the reactive brilliant blue K-GR intermediate (sodium 1-amino-4-((4-amino-3-sulfonylphenyl)amino)-anthraquinone-2-sulfonate). By means of the preparation method of the reactive brilliant blue K-GR intermediate, usage amounts of cuprous chloride and copper powder can be effectively reduced, thereby reducing the content of heavy metals in a dye product, reducing the content of heavy metals in waste water and reducing environmental pollution and production cost. In addition, the preparation method can avoid generation of a hydrolyzed by-product (a purple by-product) of the bromamine acid, can greatly reduce the generation of a debromination by-product, can significantly reduce the generation of a double-condensation substance, can increase yields of the condensation reaction and the dye product and can reduce discharge amount of waste water containing acids and being high in chroma.

Description

technical field [0001] The invention relates to reactive dye technology, in particular to a preparation method of reactive brilliant blue K-GR intermediate. Background technique [0002] Reactive brilliant blue K-GR intermediate (1-amino-4-((4-amino-3-sulfonic acid phenyl) amino)-anthraquinone-2-sulfonic acid sodium) is an acid dye, but also an important dye Intermediate (blue base), mainly used in the production of reactive dyes, such as reactive brilliant blue K-GR (C.I. reactive blue 2), C.I. reactive blue 4, C.I. reactive blue 5, etc. These reactive dyes have excellent alkali resistance and excellent Excellent light and soap fastness, and good solubility. [0003] Reactive brilliant blue K-GR intermediate is a compound with general formula I: [0004] [0005] At present, the condensation reaction process of bromic acid and 2,4-diaminobenzenesulfonic acid for the preparation of reactive brilliant blue K-GR intermediate is as follows: [0006] [0007] In the abo...

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Problems solved by technology

[0009] The object of the present invention is to propose a kind of reactive brilliant blue K-GR intermediate for the problems of incomplete bromidine conversion, many by-products and high COD in waste water in the preparation method of the existing reactive brilliant blue K-GR intermediate. The preparation method is to realize nearly 100% conversion of bromoacid, no hydrolysis of bromoacid (purple by-product) and debrominated by-product, significantly reduce the formation of bicondensate, significantly increase the yield of condensation products, reduce acid and chromaticity The discharge of deep wastewater; at the same time, it can also reduce the amount of catalyst used, do not use copper powder, reduce the content of heavy metals in condensation products, reduce the content of heavy metals in wastewater, reduce environmental pollution, and reduce production costs

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