Production process of carbazol and anthracene

Abstract

The present invention discloses a manufacture process for high quality carbazole and anthracene. The method is to wash the raw material once for removing a number of light constituent, phenanthrene, carbazole derivatives, a small quantity of anthracene and part of heavy constituent, and the loss of the carbazole is less. Afterwards, a vacuum rectification tower with siding withdrawing is adopted for withdrawing the carbazole from the siding at a proper height of the tower. The purity can reach 90 to 95 weight percent, and meanwhile a mixture with the overall purity of the anthracene and phenanthrene being up to more than 90 weight percent is obtained from the top of the tower. The two materials are respectively washed by a No.1 solvent and a No.2 solvent, and the trace impurities contained in the materials are removed. After centrifugalized, fine carbazole and fine anthracene products which are better than the first grade product (carbazole of more than 97 weight percent and fine anthracene of more than 95 weight percent) according to the national standard can be obtained. The solvent wash is operated at a normal temperature, the solvent can be withdrawn for periodic duty, is lessin loss quantity, and does not pollute environment. Not only the large-scale successive industrial production of fine carbazole and fine anthracene can be realized easily, but also the process is economic in investment, low in energy dissipation and friendly in environment.

Description

field of invention [0001] The invention relates to a new production process of high-quality carbazole and anthracene. Background technique [0002] Carbazole is an important dye and pigment intermediate, which can be used to synthesize Haichang blue, dyes for carbon paper, etc. Refined carbazole is the basic raw material for the production of permanent violet RL, which is known as the king of purple dyes. In addition, carbazole can also be used as a raw material for synthetic resins, precious metal ore flotation agents, water reducers, stabilizers for lubricating oils and heat transfer oils, surfactants, fluorescent plasticizers, etc. In the 21st century, the application of carbazole in light-conducting and conductive special high-tech materials and biologically active substances (stabilizers for pesticides, plant auxins, anti-inflammatory drugs, and drugs for treating heart disease) is even more eye-catching. [0003] The most important use of anthracene is to obtain anthr...

AI Technical Summary

Problems solved by technology

This method has the following disadvantages: 1) when extracting phenanthrene, a certain amount of anthracene and carbazole are taken out, which reduces the yield of anthracene and carbazole; 2) this method improves product quality by increasing the number of times of washing , product quality and yield are a pair of contradictions

Therefore, the production scale of this method is small, the solvent consumption is large, and the product yield and product quality are both low; 3) the traditional crude anthracene washing and refining method is basically based on the assumption that anthracene, phenanthrene, and carbazole are separated from each other. 4) There are potential safety hazards and environmental pollution problems in the process; 5) The entire production process is intermittent operation, and the degree of automation is greatly limited by objective conditions

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