Novel production process of coal-based chemical

Abstract

The invention discloses a novel production process of a coal-based chemical. A coal tar raw material is subjected to pretreatment; hydrofining and hydrocracking reaction are performed; the obtained liquid is subjected to fractionation; diesel fractions are obtained and enter a supplementation refining reaction region; under the effect of supplementation refining catalysts, hydrogenation saturationreaction is performed; supplementation refining products are cut; the obtained distillates are subjected to cooling temperature lowering and filtering to obtain high-purity hexadecahydropyrene; the rest heavy distillates return to a hydrocracking reactor for continuous cracking reaction so as to obtain more hexadecahydropyrene ingredients. The goal of producing the hexadecahydropyrene by using coal tar as raw materials through a hydrogenization process is firstly realized. Compared with the prior art, the method provided by the invention has the advantages that the high-purity hexadecahydropyrene is obtained; meanwhile, byproducts of clean fuel oil products and solvent oil products with the quality meeting the requirements can be obtained. The method changes the situation that the hexadecahydropyrene completely relies on the import; the coal tar processing economical performance is improved; the characteristics of simple process and low operation energy consumption are realized.

Description

technical field [0001] The invention belongs to the field of deep processing of coal tar, and in particular relates to a new production process of coal-based chemicals. Specifically, it is a method of directly producing high-purity hexadecahydropyrene using coal tar as a raw material. Background technique [0002] The traditional production process and method of hexadecanine hydrogen pyrene are monopolized by foreign countries, and the price is expensive. The domestic basically needs to import products that meet the requirements. The higher the purity of hexahydropyrene, the more stringent the process method. Therefore, the products that meet the market requirements become rare resources. [0003] In view of the above-mentioned problems, few existing technologies have been disclosed at present, and the use of synthesis and other methods is one of the methods to solve the production of high-purity hexadecahydropyrene. Pyrene is an important component in coal tar, which is e...

AI Technical Summary

Problems solved by technology

The raw material of coal tar basically does not contain hexadecahydropyrene, and there is no report on the direct extraction of hexadecahydropyrene from coal tar. The operating cost is high, and the extracted hexadecahydropyrene is low in purity and yield, which is economically unfeasible.

The preparation of 1,2,3,6,7,8-hexahydropyrene is generally mainly obtained through the selective catalytic hydrogenation of pyrene. Since the serial reactions and parallel reactions are carried out simultaneously, it is difficult to select a single product. Improvement, it is more difficult to obtain high-purity hexadecahydropyrene

[0004] CN1351130A introduces a method for producing diesel oil through hydrogenation of coal tar, mainly through fractionation of coal tar, and the fraction below the diesel oil obtained is subjected to hydrogenation refining, which can directly produce diesel oil that meets the fuel oil index or be used as a blending component of diesel products. However, it only hydrotreats the relatively light fractions in coal tar, and cannot extract high-value-added, high-purity cetylhydropyrene products, and does not fully utilize coal tar

Hexahydropyrene products cannot be extracted from the distillate, and only blended fuel oil is produced. The coal tar directly entering the high-temperature heating furnace in this process will cause coking of the furnace tube and affect the normal operation cycle of the device.

Images