Coal pitch refining method used for synthesizing mesophase pitch

Abstract

The invention relates to a coal pitch refining method used for synthesizing mesophase pitch. The coal pitch refining method used for synthesizing mesophase pitch comprises following steps: coal pitchis smashed and sieved, a mixed solvent A is added into coal pitch, an obtained mixture is stirred, is allowed to stand, and is subjected to layering so as to obtain an upper layer which is a mixed solution A of the mixed solvent A and coal pitch, and a lower layer which is an impurity mixture containing coal powder coke particles; the upper layer mixed solution A is subjected to filtering and distillation for recovery of the mixed solvent A so as to obtain crude coal pitch; a mixed solvent B is added into the crude coal pitch, and stirring, standing, and layering are carried out so as to obtain an upper layer which is a mixed solution B of the mixed solvent B and refined coal pitch, and a lower layer which is a heavy asphalt impurity mixture; the upper layer mixed solution B is subjected to filtering and distillation for recovery of the mixed solvent B so as to obtain refined coal pitch can be used for synthesizing mesophase pitch. The coal pitch refining method is capable of realizingseparation of coal pitch effective components with impurities such as coal powder coke particles under normal pressure conditions, the obtained refined coal pitch can be taken as a high grade carbonmaterial raw material, and the requirements of subsequent high added value product production are satisfied.

Description

technical field [0001] The invention belongs to the technical field of asphalt refining, in particular to a coal tar pitch refining method for synthesizing mesophase pitch. Background technique [0002] Coal tar pitch is a conventional distillation product of coal tar, which contains a large amount of coal powder and coke particles brought in during the production of coal tar and secondary polymer impurities produced during high-temperature distillation. These impurities are difficult to remove through general treatment methods. As a result, pitch can only be used as a low-end product and cannot be further refined into carbon fiber or needle coke. [0003] At present, domestic asphalt refining methods mostly use hot-melt filtration and centrifugation. The disadvantage is that it cannot effectively remove impurities with small particle sizes in coal tar pitch, and the operation is relatively complicated. To a certain extent, the original components of asphalt are destroyed, r...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a coal tar pitch refining method for synthesizing mesophase pitch, to solve the technical problem that the pitch obtained by the conventional refining process cannot be used as a raw material for high-end carbon materials