Solvent in use for purifying products in anthracene series in crystal level

Abstract

This invention relates to a solvent for crystallizing and purifying anthracene series products, which is composed of toluene, xylene, trimethylbenzene, styrene, benzofuran, indane and indene, wherein the sum of toluene, xylene and trimethylbenzene is 70-95 wt.%; the sum of xylene and styrene is 70-90 wt.%; the sum of benzofuran, indane and indene is 1-5 wt.%. The solvent can increase the washing and separation abilities to the impurities in the anthracene range in tar, improve the purification effect of anthracene and carbazole, and increase the yield.

Description

technical field [0001] The invention relates to a solvent used for crystallization and purification of anthracene series products, and is especially suitable for separating condensed rings and heterocycles in coal chemical tar components and purifying anthracene series products. Background technique [0002] At present, for the refining of anthracene and carbazole, anthracene products of coal chemical industry, there are mainly methods of distillation, or crystallization, or solvent crystallization combined with distillation, to remove the impurity components in the anthracene segment of tar through separation. To achieve the purpose of purifying anthracene and carbazole. [0003] The current composition of the tar anthracene segment is shown in Table 1: [0004] [0005] Table 1. The components of the current tar anthracene segment [0006] As can be understood from Table 1, if the distillation method is used, it cannot be refined, and if the crystallization method is ...

AI Technical Summary

Problems solved by technology

[0007] In the existing literature and practical application, the solvent is benzene, acetone, etc., but the disadvantages of these solvents are: 1. When the impurities are separated, the useful components will be taken away too much; 2. In industrialization not feasible in production

[0008] In the current production process, the flash oil of coking heavy benzene is also used as a solvent, but this solvent has poor washing and separation ability for components such as 2-methyl anthracene, so that the quality of anthracene products cannot meet the standard. and low yield

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