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 refined anthracene, 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: 2014-07-23
石其贵
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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%
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Embodiment Construction
[0011] 1. A method for producing refined anthracene and 98% carbazole with a content greater than 96%:
[0012] 1.1. Wash crude anthracene with S-100 mother liquor to remove phenanthrene:
[0013] Add the S-100 solvent mother liquor obtained from the first crystallization process of carbazole into the crystallization tank, start stirring, add crude anthracene, close the manhole cover, open the steam valve, adjust the steam to 0.3Mpa, raise the temperature to 120°C, close the steam valve, and keep warm for 30 Minutes, lower the temperature to 90°C, turn on the cooling water, cool the crystallization, the temperature in the crystallization tank is cooled to 30°C, put the crystallization material into the suction filter tank, and the filter cake enters the first crystallization of anthracene;
[0014] 1.2. Primary crystallization process of anthracene:
[0015] Add the DMF mother liquor obtained in the secondary crystallization process of anthracene to the crystallization tank, ...
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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 deep-processed products of coal tar, and this patent belongs to the field of chemical technology. Background technique: [0002] Anthracene, carbazole and phenanthrene belong to polycyclic aromatic hydrocarbons. Anthracene and phenanthrene are isomers. There is a five-membered nitrogen-containing heterocycle (pyrrole ring) in the carbazole structure. They are all high boiling point 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 with a content greater than 1.0% in coal tar, which shows their importance in coal tar processing. [0003] Anthracene, carbazole and phenanthrene have high and close boiling points and high melting points, so separation is difficult. What is currently used is the solvent washing crystalliza...
Claims
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IPC IPC(8): C07D209/84C07C15/28C07C7/10
Inventor 石其贵石见明
Owner 石其贵