Coal tar hydrogenation process for maximizing utilization of coal tar residues

Abstract

The invention discloses a coal tar hydrogenation process which comprises the following steps: (1), carrying out distillation onto the coal tar; (2), carrying out hydrogenation treatment onto distilled heavy distillate oil; (3), carrying out gas-liquid separation onto the hydrogenated product; (4), feeding a liquid-phase material obtained by gas-liquid separation into a first separator, and feeding a vapor-phase material into a low-temperature separator; (5), mixing heavy residual oil obtained through separation of the first separator, a liquid-phase separated out by a low-temperature separator and light distillate oil, and then feeding into a second separator; (6), mixing light oil obtained by the first separator and the second separator and then filtering, and distilling the filtrate to obtain light oil, medium-weight oil and heavy oil; and (7), feeding the heavy oil into a delayed coking system to produce needle cokes and circulation oil, feeding the circulation oil into a slurry-bed reactor, and carrying out hydrorefining onto the light oil and the medium-weight oil to obtain petroleum and aviation kerosene. According to the coal tar hydrogenation process disclosed by the invention, the coal tar hydrogenation and residual oil extraction are combined together, so that utilization rate of active ingredients in the heavy residues and gas-oil recovery rate of the coal tar are increased.

Description

technical field [0001] The invention belongs to the fields of coal tar hydrogenation and needle coke processing, and in particular relates to a novel hydrogenation process capable of realizing the maximum utilization of coal tar residues and increasing the value of coal tar. Background technique [0002] After decades of development, my country's coal chemical industry occupies a very important position in the chemical industry. In recent years, due to rising international oil prices and the utilization of clean energy, coal chemical industry has increasingly shown its advantages. From the traditional process of coal coking, coal gasification-synthetic ammonia-chemical fertilizer to coal gasification, coal-to-natural gas, coal-to-methanol, coal-to-olefin, coal-to-oil, sustained and rapid development has been achieved in recent years. Processes such as coal coking, coal-to-gas, and coal-to-semi-coke all produce a large number of by-products, namely high-temperature coal tar ...

AI Technical Summary

Problems solved by technology

[0007] What the present invention aims to solve is the problem in the prior art that the solid residual oil produced after the hydrogenation of coal tar fractions >350°C has not been effectively utilized. Organically combined to provide a coal tar hydrogenation process that can maximize the utilization of solid residual oil and co-produce gasoline, diesel, and needle coke products