Lignite solubilizing and catalytic liquefaction method in non-hydrogen atmosphere

Abstract

The invention belongs to the technical field of coal chemical processing and discloses a lignite solubilizing and catalytic liquefaction method in non-hydrogen atmosphere. The method comprises the following steps: preparing coal powder, preparing coal slurry, performing thermal dissolution and catalysis, and separating the thermal dissolution liquefied product, wherein in the coal powder preparation step, the water content of coal powder is no less than 8w%; and in the thermal dissolution and catalysis step, CO gas is introduced. In the method, CO is used as medium, thus the solvent can be optimized and the quality of liquefaction oil can be increased; H2O required by the reaction comes from the lignite with rich water, thus the limit on the water of lignite can be lowered, the heating drying of lignite can be eliminated and the energy consumption can be reduced; the water production rate in the liquefaction of lignite can be reduced, thus water pollutions can be reduced; the chemical reaction is utilized to generate active hydrogen which is easy to react with coal, thus the yield of liquefaction oil can be increased and coal is easy to dissolve; and CO is used to remove partial oxygen and sulfur in the coal structure and the consumption of hydrogen can be reduced. The operational process is simple, safe and stable, the localization degree of equipment is high, the investment is low and the cost is low.

Description

technical field [0001] The invention belongs to the technical field of coal chemical processing, and in particular relates to a lignite solubilization catalytic liquefaction method under a non-hydrogen atmosphere. Background technique [0002] Coal liquefaction is a technology that uses coal as raw material and liquid hydrocarbons as the main product. It is divided into two categories: "direct liquefaction" and "indirect liquefaction": (1) direct liquefaction of coal is that coal is processed under relatively high temperature and pressure. Catalytic hydrocracking is the process of generating liquid hydrocarbons and a small amount of gaseous hydrocarbons, and removing heteroatoms such as nitrogen, oxygen and sulfur in coal; (2) indirect liquefaction of coal is the synthesis gas (CO+H 2 ) as a raw material, under a certain temperature and pressure, the process of catalytically synthesizing hydrocarbon fuel oil and chemical raw materials. [0003] The existing direct coal liqu...

AI Technical Summary

Problems solved by technology

However, there are still many problems to be solved, such as: high production cost, not enough to compete with oil; high energy consumption, direct coal liquefaction requires coal moisture <2%, which will inevitably increase the energy consumption and cost of coal drying equipment invest

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