Method of directly liquifying coal

Abstract

The invention relates to a coal direct liquefaction method. It includes the following steps: mixing coal slurry which is made up of coal dust, hydrogenation cycle solvent, and iron catalyst with freshness or cycle hydrogen; reacting by the first and second reactor; sending the product from the second reactor to high temperature separator to separate; the weight flow ratio of the recycle and freshness materials is 2-20. The method can reduce hydrogen consumption and gas yield.

Description

technical field [0001] The invention relates to the field of coal chemical processing, more specifically, a coal direct liquefaction method. Background technique [0002] At present, most of the coal direct liquefaction processes complete the coal liquefaction reaction in a reaction system. Since the direct coal liquefaction reaction is a parallel series reaction system, it will inevitably cause secondary decomposition of the target product, resulting in a decrease in oil yield and an increase in hydrogen consumption. [0003] The research project completed by the American HRI company (renamed HTI company after 1996) from October 1991 to March 1994, HRI conducted laboratory-scale experimental research, the reactor used a continuous mechanical stirring reactor, and developed Two-stage liquefaction process with intermediate separator and fixed-bed hydrogenation reactors connected in series. This process was later developed into the HTI coal liquefaction process. The test sc...

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Problems solved by technology

[0005] The above process adopts the method of adding a separator between the two reactors to solve the problem of secondary decomposition of the produced oil, but the investment in equipment is greatly increased, which is equivalent to adding a set of separation system, including a set of separators, wear-resistant high-pressure differential decompression valves, cycle compressors, etc.

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