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Method for preparing refined anthracene with content of more than 96 percent and carbazole with content of more than 98 percent

A technology of carbazole and content, applied in organic chemistry, extraction purification/separation, etc., can solve the problem that the content of refined anthracene can only reach 90%

Inactive Publication Date: 2011-05-25
石其贵
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, in domestic production of refined anthracene and carbazole, crude anthracene is used as raw material, which mainly contains anthracene, carbazole, and phenanthrene. The process used in China is to first extract refined anthracene with DMF solvent. reach 90%

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0011] 1. Wash crude anthracene with S-100 mother liquor to remove phenanthrene

[0012] Add the S-100 solvent mother liquor used in the primary crystallization process of carbazole into the crystallizing tank, start stirring, add crude anthracene, close the manhole cover, open the steam valve, adjust the steam to 0.3Mpa, and raise the temperature to 120°C, close the steam valve, and keep warm. 30 minutes. Cool down to 90 ℃, open cooling water, and crystallize after cooling. The temperature in the crystallizing tank was cooled to 30°C, and the crystallized material was put into the draw filter tank, filtered and entered into the first crystallization of anthracene.

[0013] 2. Primary crystallization of anthracene

[0014] The DMF mother liquor was added to the crystallizing tank, stirring was started, the filter was added, the manhole was closed, the jacket was heated with 0.3MPd steam, and the heating was stopped at 120°C, and the temperature was kept for 30 minutes. The ...

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PUM

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Abstract

The invention discloses a method for preparing refined anthracene with content of more than 96 percent and carbazole with content of more than 98 percent. The refined anthracene and the carbazole are deep processed products of coal tar and belong to the technical field of chemical industries. At present, in the production of the carbazole and the refined anthracene in China, the refined anthracene content is only 90 percent, and the carbazole content is only 95 percent. A technical problem to be solved by the invention is that: the refined anthracene content is over 96 percent, and the carbazole content is over 98 percent; in the production process of the carbazole, 8 to 12 times of recrystallization are reduced to 2 times; and yield is increased to 80 percent from 40 percent of the original yield. On the basis of the conventional production process of the carbazole and the refined anthracene in China, two processes of washing crude anthracene with S-100 mother solution to remove phenanthrene with the largest content, and evaporating the crude carbazole are added. A technique of the invention is applied to the deep processing industry of the coal tar.

Description

Technical field: [0001] Refined anthracene and carbazole are products of deep processing of coal tar, and this patent belongs to the technical field of chemical industry. Background technique: [0002] Anthracene, carbazole and phenanthrene belong to the polycyclic aromatic hydrocarbons, anthracene and phenanthrene are isomers, and there is a five-membered nitrogen-containing heterocycle (pyrrole ring) in the carbazole structure. They are both high boiling and high melting point hydrocarbons present in the anthracene oil fraction of coal tar. In coal tar, anthracene accounts for 1.2-1.8%, carbazole accounts for 1.5%, and phenanthrene accounts for 4.5-5.0%. They account for three of the 12 compounds whose content is greater than 1.0% in coal tar, which shows its importance in coal tar processing. [0003] Anthracene, carbazole and phenanthrene have high and close boiling points and high melting points, so separation is difficult. At present, the solvent washing crystalliza...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D209/84C07C15/28C07C7/10
Inventor 石其贵石见明
Owner 石其贵