Method of preparing mesophase pitch by means of naphthene-based vacuum gas oil co-carbonization

Abstract

The invention provides a method of preparing mesophase pitch. The method comprises the following steps: with the furfural extract oil of naphthene-based crude oil vacuum gas oil as raw material, carrying out oxidative cross-linking modification on the raw material by air to obtain an intermediate product; carrying out a co-carbonization treatment on the intermediate product under the synergetic hydrogen supply action of a hydrogen atmosphere and a hydrogen supply solvent to obtain the mesophase pitch, wherein the hydrogen supply solvent is 1,2,3,4-tetrahydroquinoline, and the adding amount is 5-20wt% of the amount of the raw material. According to the method provided by the invention, the cross-linking modification of the raw material is realized by means of air oxidation, thus the softening point and the carbonization yield of the raw material are increased, and moreover, lots of oxygen atoms are not introduced in the molecules of the modified raw material, thus the carbonization action thereof is not influenced; under the hydrogen atmosphere, an appropriate amount of the hydrogen supply solvent is added to carry out synergetic hydrogen supply co-carbonization with the cross-linked raw material, thus the carbonization reaction action of the raw material can be further improved. The mesophase pitch prepared by the method provided by the invention presents a flow state or a large texture-type state.

Description

technical field [0001] The invention relates to the technical field of mesophase pitch preparation, in particular to a method for preparing mesophase pitch by using furfural extracted oil of naphthenic vacuum fraction as a raw material. Background technique [0002] Mesophase pitch (MP for short) is a mixture of a variety of flat disk-shaped condensed ring aromatic hydrocarbons with a relative molecular mass of 370-2000. It is a kind of nematic liquid crystal produced by the heat treatment process of heavy aromatic hydrocarbon mixture. Substance, also known as liquid crystal phase pitch. Mesophase pitch has the advantages of wide source of raw materials, excellent performance, high carbon yield and strong processability. Needle coke, carbon microspheres, composite materials, fluorocarbon materials, carbon foam, carbon sheets and carbon films, mesophase pitch-based electrode materials, high-temperature lubricants, etc. These functional materials will be used in defense indus...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is how to overcome the problem of low yield due to the large amount of light components being taken out of the reaction system in the preparation of mesophase pitch by direct thermal polycondensation under normal pressure. Due to the high pressure of the system, a large number of light components hinder the accumulation of planar aromatic molecules and affect the formation of mesophase pitch. The conventional thermal condensation polymerization after crosslinking often targets coal tar and coal tar pitch, and the used The price and cost of the crosslinking agent are high; and how to overcome the problem that the amount of hydrogen-donating solvent used for hydrogen-donating modification of raw materials needs to be recycled.