Carbazole purification technology and system and operation method of system
A carbazole and process technology, applied in the field of carbazole purification process, to achieve good environmental protection effect, improve the operating environment, and reduce environmental pollution
Pending Publication Date: 2019-09-24
ACRE COKING & REFRACTORY ENG CONSULTING CORP DALIAN MCC
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Problems solved by technology
Among them, solvent crystallization-rectification method is a relatively advanced process for refining carbazole at present, and the purity of the obtained carbazole product is about 92%, which belongs to the category of general grade, so it needs to be purified to high-grade carbazole (purity is about is 98%); at present, the process of crystallizing and purifying carbazole by solvent-free method is rarely reported
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[0037] The specific embodiment of the present invention will be further described below in conjunction with accompanying drawing:
[0038] A kind of carbazole purification process of the present invention, comprises the steps:
[0039] 1) Purification and crystallization stage: The raw material carbazole is statically crystallized in the crystallizer, and the growth rate of the crystal is controlled by controlling the cooling temperature of the heat transfer oil. After the crystallization is completed, the mother liquor is discharged and sweated, and finally liquid carbazole with a purity of 98% is obtained;
[0040] 2) Concentration stage; the mother liquor produced in the purification and crystallization stage is statically crystallized in the crystallizer, and the growth rate of the crystal is controlled by controlling the cooling temperature of the heat transfer oil. After the crystallization is completed, the raffinate is discharged to sweat, and the liquid carbazole is di...
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The invention relates to a carbazole purification technology and system and an operation method of the system. The carbazole purification technology comprises the steps of 1, purification and crystallization, wherein the raw material of carbazole is subjected to static crystallization in a crystallizer, the growth rate of crystals is controlled by controlling the cooling temperature of heat conduction oil, mother liquor is discharged after crystallization is finished, and sweating is performed to finally obtain liquid carbazole with the purity of 98%; 2, concentration, wherein the mother liquor generated in the purification and crystallization stage is subjected to static crystallization in the crystallizer, the growth rate of the crystals is controlled by controlling the cooling temperature of the heat conduction oil, residual liquid is discharged after crystallization is completed, sweating is carried out, and the liquid carbazole is discharged into a carbazole raw material tank to serve as the raw material for next crystallization. In the method, carbazole purification is realized through the purification and crystallization stage and the concentration stage, and the two stages adopt solvent-free static melt crystallization and intermittent multi-stage operation to finally obtain the liquid carbazole with the purity of 98%.
Description
technical field [0001] The invention relates to the technical field of coal tar deep processing, in particular to a carbazole purification process, system and system operation method. Background technique [0002] Carbazole is one of the components with the highest economic value in coal tar. It is an important intermediate in the synthesis of fine chemicals and can be used in the production of fuels, pigments, pesticides, medicines, photoelectric new materials, special inks and synthetic resins. With the development of fine chemical industry and the advancement of organic synthesis technology, the demand for high-purity carbazole is increasing day by day. The higher the purity of the product carbazole, the stronger the market competitiveness and the more considerable economic benefits. [0003] The main technology for producing carbazole at this stage is solvent method, including solvent washing method, rectification-solvent method and solvent crystallization-rectification ...
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IPC IPC(8): C07D209/84
CPCC07D209/84
Inventor 杨浩霍素斌贾骞
Owner ACRE COKING & REFRACTORY ENG CONSULTING CORP DALIAN MCC