Environment-friendly production method for permanent violet RL

A production method, permanent violet technology, applied in the field of synthetic technology of permanent violet RL, can solve the problems of low conversion rate, harsh transportation and storage management conditions, high cost of use, etc., to achieve convenient temperature control, high product quality and The effect of economic benefits
CN102504567BInactive Publication Date: 2012-11-21东台市新锦泰化工有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
东台市新锦泰化工有限公司
Publication Date
2012-11-21
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses an environment-friendly production method for permanent violet RL, which comprises the following: (1) a step of alkylation which is to prepare liquid caustic soda, add a carbazole raw material, a catalyst and pure benzene in turn, drip bromoethane, stand the solution and separate out N-ethyl carbazole; (2) a step of nitration, which is to add the N-ethyl carbazole and chlorobenzene, drip nitric acid of which the weight percentage concentration is 36.5 to 37.5 percent, and separate out an intermediate 3-nitro-N-ethyl carbazole; (3) a step of reduction, which is to add chlorobenzene, 3-nitro-N-ethyl carbazole and an iron catalyst in turn, drip hydrazine hydrate to obtain a solution of 3-animo-N-ethyl carbazole and ortho-dichlorobenzene; (4) a step of condensation, which is to add ortho-dichlorobenzene into the solution of 3-animo-N-ethyl carbazole and ortho-dichlorobenzene, add tetrachlorobenzoquinone, drip sodium acetate and obtain a permanent violet RL condensation compound; and (5) a step of ring-closing reaction, which is to add benzene sulfonyl chloride, filter the solution, wash a filter cake, dry and obtain coarse permanent violet RL. The method has high conversion rate and is environment-friendly.
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Description

technical field

[0001] The invention relates to a production method of an organic pigment, in particular to a synthesis process of permanent violet RL. Background technique

[0002] Permanent Violet RL is a high-grade organic pigment of dioxazine series. It has outstanding coloring strength, brightness and excellent heat resistance, permeation resistance and light fastness. It has excellent performance indicators and is widely used. Used in coatings, plastics, rubber, solvents, plexiglass, textile printing and dyeing, water-based ink and packaging printing, etc., it is currently one of the most expensive pigments in the world, and it is also the best purple pigment used in the plastics industry so far.

[0003] Permanent Violet RL is made of N-ethylcarbazole by alkylation of carbazole, then nitrated and reduced to produce 3-amino-N-ethylcarbazole, and then condensed with chloranil in an organic solvent , closed loop, and finally through the process of pigmentation to obtain...

Claims

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