Separation method and devices of thermal dissolution and catalysis liquefied product of lignite

Abstract

The invention discloses a separation method of a thermal dissolution and catalysis liquefied product of lignite. In the method, a light oil separation system, a medium oil separation system, a heavy oil separation system and a coked oil separation system are utilized to treat the thermal dissolution and catalysis liquefied product of the lignite, wherein a high temperature separator, a medium voltage separator and a vacuum separator are the main separation devices. By adopting the method, the gas-liquid-solid three-phase separation effect of the thermal dissolution and catalysis liquefied product of the lignite can be increased, the separation speed can be increased, the production capacity can be increased, the total yield of liquefaction oil can be increased, and the energy consumption can be reduced; and the method can be directly used as the subsequent treatment procedure of the thermal dissolution and catalysis liquefaction process so as to increase the benefits of the whole coal liquefaction process. Meanwhile, the operating 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 method and equipment for separating lignite thermally dissolved catalytic liquefaction products. 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) The direct liquefaction of coal is the process of liquefaction of coal under relatively high temperature and pressure. , catalytic hydrocracking to generate liquid hydrocarbons and a small amount of gaseous hydrocarbons, and the conversion process of 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. ...

AI Technical Summary

Problems solved by technology

At present, the traditional solid-liquid separation technologies mainly include filtration, critical solvent extraction and vacuum distillation, etc., but these solid-liquid separation technologies have disadvantages such as large equipment, slow speed, and low total yield of liquefied oil.

Images