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Technique for producing sumitone fast violet RL

A production process and a technology for permanent violet, applied in the chemical industry, can solve the problems of large amount of ortho-dichlorobenzene, large labor consumption, serious environmental pollution, etc., and achieve the effects of short reaction time, small production process pollution and stable product quality.

Active Publication Date: 2007-02-21
南通龙晨新材料科技有限公司
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  • Abstract
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Problems solved by technology

And this method is because of the large amount of o-dichlorobenzene, the environmental pollution caused by the difficulty of recycling is more serious, the labor consumption is relatively large, and the injury to the human body is also relatively large

Method used

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  • Technique for producing sumitone fast violet RL
  • Technique for producing sumitone fast violet RL
  • Technique for producing sumitone fast violet RL

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Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0042] Below in conjunction with accompanying drawing, the present invention will be further described:

[0043] 1. Alkylation process

[0044] 1. Put 46% liquid caustic soda into the reaction pot (if the content is insufficient, add caustic soda).

[0045] 2. Cool to below 35°C while stirring, then put in carbazole and catalyst benzyl ammonium chloride.

[0046] 3. After adding carbazole and catalyst, cover and seal, stir for 15 minutes, then slowly add pure benzene and ethyl bromide under stirring.

[0047] 4. After adding pure benzene and ethyl bromide, stir for 15 minutes and slowly raise the temperature to 40-45°C. If there is reflux, stop heating and keep reflux to maintain the temperature.

[0048] 5. After the reflux is completed, the temperature is raised to 100-120α / s, and pure benzene is recovered, and the recovery amount is about 80% of the feeding amount.

[0049] 6. After recovery of pure benzene, stand still for 20 minutes, then separate the lower layer of li...

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Abstract

This invention discloses a method for producing semitone fast violet RL. The method uses carbazole as the raw material, and comprises alkylating, nitrifying, reducing, condensing, ring closing and ball-milling. The method makes improvement on the present nitrifying and ring closing techniques. After improvement, the nitrifying technique has a short reaction time and a high recovery rate of solvent o-dichlorobenzene. The method has such advantages as little pollution, little harm to operators and stable product quality.

Description

Technical field: [0001] The invention relates to a production process of a high-grade organic pigment-permanent violet RL, which belongs to the field of chemical industry. Background technique: [0002] Permanent Violet RL is a high-grade organic pigment with high strength, bright color, excellent performance and wide application. It is widely used in all paints, inks, plastics, synthetic and natural rubber PET, PPA-66, PA-6, PRB, PE viscose Protoplasm coloring of fibers, pigment printing of textiles, can also be extended to produce direct sunfast blue and other varieties. [0003] Permanent Violet RL is obtained by alkylation of carbazole to N-ethyl carbazole, and then 3-amino N-ethyl carbazole is generated by nitration reduction, and then condensed with tetrachlorobenzoquinone in an organic solvent, and the ring is closed to form Now, the relevant situation of the product is introduced as follows: [0004] 1. Product name: Everlasting Purple RL [0005] 2. Chemical stru...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09B57/00
Inventor 杨连飞茅志宏王思源
Owner 南通龙晨新材料科技有限公司
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