Method for preparing mesophase asphalt by coal liquefaction residue

Abstract

The invention relates to a method for preparing mesophase asphalt by coal liquefaction residue. In the method, the coal liquefaction residue is ground, screened and dried, and is extracted at certain temperature for certain time by using organic solvent as extracting solvent; the extracted mixed liquor is filtered, purified and evaporated; the extracting solvent in the extract liquor is evaporatedto obtain refined coal liquefaction oil asphalt, thus obtaining the mesophase asphalt by charring for 4-10 hours in a high-pressure autoclave under the conditions of 410-460 DEG C, 3-4MPa of constantpressure and stirring. The method has simple process and convenient and safe operation, the mesophase asphalt with high quality is prepared and can be used as raw materials of high power and ultra high power graphite electrode, carbon fiber and the like.

Description

technical field [0001] The invention relates to the field of coal deep processing, in particular to a method for preparing mesophase pitch from coal liquefaction residue with simple process, convenient operation and high quality. Background technique [0002] With the rapid and steady development of the economy and the continuous improvement of people's living standards, my country's demand for energy, especially for oil, has entered a period of rapid growth. my country's primary energy resources are characterized by "more coal, less oil and less natural gas". my country has transformed from an oil exporter to a major importer of oil and natural gas. Importing a large amount of crude oil not only increases the dependence on foreign resources, but also the fluctuations and changes in the international oil market directly affect my country's economic development and energy supply security. Therefore, making full use of abundant coal resources and vigorously developing coal-to...

AI Technical Summary

Problems solved by technology

The carbon-hydrogen ratio of the liquefaction residue is high, and direct combustion not only affects the economics of coal liquefaction, but also the sulfur content in the residue obtained by the liquefaction process using sulfur-iron-based catalysts is very high, and direct combustion is contrary to the liquefaction process as a clean coal The original intention of technology

Converting the asphaltenes in the liquefaction residue into heavy oil and distillable oil, that is, coking to oil, increases the yield of liquid oil in the coal liquefaction process, but the liquefaction residue cannot be fully utilized, and it is necessary to further seek the main product of coking—semi Utilization of coke or coke

None of the traditional utilizations of liquefaction residues yield the most beneficial target products