A kind of preparation method of vat brown rp dye

A dye and material technology, applied in the field of vat brown RP dye preparation, can solve the problems of low cost and poor quality, and achieve the effects of good product quality, increased product yield, and reduced cost
CN104371346BActive Publication Date: 2016-08-17安徽融创化工科技股份有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
安徽融创化工科技股份有限公司
Publication Date
2016-08-17

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Abstract

The invention provides a method for manufacturing vat brown RP dyestuffs. The method includes that 3,9-dibromo-benzanthrone and 1-amino-anthraquinone are subjected to condensation reaction under the effects of acid-binding agents and catalysts to generate condensate brown RP imine, then ring forming agents are added into the condensate brown RP imine, and the condensate brown RP imine and the ring forming agents are subjected to ring-closure reaction and are refined to obtain vat brown RP products. The method is characterized in that the ring forming agents for the ring-closure reaction are aluminum trichloride and pyridine, and sulfuric acid and sodium chlorate are oxidized to remove copper during refining. The method has the advantages that ring-closure reaction can be completely carried out, the product yield can be increased, the cost can be reduced, and the obtained products are high in quality; impurities such as the ring forming agents and the copper can be removed by the aid of an oxidization copper removing process, the products are high in purity, and the performance of the dyestuffs can be improved.
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Description

technical field

[0001] The invention belongs to the technical field of dye preparation, and relates to a preparation method of vat brown RP dye. Background technique

[0002] Vat brown RP is an anthraquinone-type vat dye, also known as red brown 81. Its structural formula is as follows:

[0003]

[0004] Vat brown RP occupies an extremely important position in vat dyes. According to the nomenclature of dyes, it is expressed as a vat brown dye with red light. It has good level dyeing property and good affinity. It is mainly used for printing cotton fiber, viscose fiber, vinylon, etc. And dyeing, can also be used as organic pigments.

[0005] The production process of reduced brown RP is as follows: the raw materials undergo condensation reaction under the action of an acid-binding agent and a catalyst to generate condensed brown RP imine, and then add a ring structure agent for ring-closing reaction to obtain a reduced brown RP product.

[0006] In the preparation proces...

Claims

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