Stabilized hydrogenation method of coal liquefied oil

Abstract

A hydrogenation stabilizing method of coal liquefied oil is carried out by filtering coal liquefied oil, entering it and hydrogen into expanded bed reactor from reactor bottom, contacting with hydrogenation refined catalyst, gas-liquid separating, distilling, separating, circulating for hydrogen-enriched flow separated and returning it to expanded bed reactor. It has slower reactor pressure raising speed, longer working period, better catalyst activity and coal liquefied oil quality.

Description

technical field [0001] The invention relates to a method for hydrogenation treatment of liquid hydrocarbons obtained by destructive hydrogenation of coal. More specifically, it is a hydrofinishing method for coal liquefied oil. Background technique [0002] As early as 1913, Germany had started research on the technology of direct coal liquefaction to produce liquid hydrocarbon products, and industrialized the technology of producing gasoline by direct liquefaction of lignite in 1927. Since the first world oil crisis occurred in 1973, the direct coal liquefaction technology has attracted the attention of developed countries, and many direct coal liquefaction processes have been developed successively. [0003] Because coal liquefied oil contains a large amount of olefins, the nitrogen content is generally above 0.5%, and it also contains a certain amount of oxygen. If it is not pretreated in time, it is very easy to generate substances that are not conducive to subsequent t...

AI Technical Summary

Problems solved by technology

[0006] The above-mentioned existing technologies all use conventional fixed-bed reactors, and the unconverted coal powder and coal liquefaction catalyst will be deposited on the top of the reactor, causing the pressure drop of the reactor to rise rapidly and shortening the start-up period; the metals and Asphaltene, etc. will be deposited on the surface of the catalyst in the upper part of the reactor, resulting in rapid deactivation of the catalyst in the upper part of the reactor

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