Method for preparing high-quality mesophase pitch by ternary co-carbonization

Abstract

The invention discloses a method for preparing high-quality mesophase pitch by ternary co-carbonization, and belongs to the technical field of deep processing of coal tar pitch. The method is characterized in that the high-quality mesophase pitch is prepared from a small amount of graphene and a hydrogen supply reagent as additives and refined coal pitch as a raw material. The method comprises thesteps as follows: firstly, refined coal tar pitch powder and a small amount of graphene are put into a mixer to be evenly mixed, and then the mixed powder and the hydrogen supply reagent are put intoa high temperature and high pressure reactor to be subjected to direct thermal polymerization, and the high-quality mesophase pitch product is obtained. Formation of mesophase pitch in the reactor isobviously accelerated by addition of a small amount of graphene and the hydrogen supply reagent, so that the reaction temperature required for formation of the mesophase pitch from the refined coal pitch is reduced, and time is shortened. The mesophase content of the obtained product is as high as 80% or higher, the optical structure of the product is wide-area streamlined, and the product has low softening point and good spinnability, and can be used for preparing high-end carbon materials such as high-performance carbon fiber and high-heat conducting foam carbon.

Description

technical field [0001] The present invention relates to a preparation method of high-performance mesophase pitch, specifically a method for preparing high-quality coal-based mesophase pitch by using a small amount of graphene and a hydrogen-donating agent as additives and using refined coal tar pitch as a raw material through co-carbonization The method belongs to the technical field of coal tar pitch deep processing. Background technique [0002] Refined coal tar pitch is the product obtained by purification of medium temperature coal tar pitch. It not only has a very low ash content but also maintains a high degree of aromaticity, and is easy to polycondensate to form mesophase pitch. Compared with traditional coal tar pitch and petroleum pitch, the intermediate phase prepared by refined coal tar pitch is purer. Compared with artificially synthesized pure pitch, the source of raw materials is wide and the cost is low. It is a kind of preparation of mesophase pitch and then...

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Problems solved by technology

However, the catalytic hydrogenation process complicates the production process, greatly increases the production cost, and the catalyst is difficult to remove, resulting in high ash content in the product, which adversely affects the performance of subsequent carbon materials

Another example is the patent CN103923681A, which uses coal liquefaction refined asphalt as raw material, uses coking heavy oil, self-washing oil, anthracene oil and other coal tar deep-processed products as additives, and prepares mesophase pitch by co-carbonization method, although the viscosity of the system is reduced and the system is improved. fluidity, but at the same time it also prolongs the polymerization reaction time and increases energy consumption, and the addition of various oils will also introduce some impurities, which will increase the ash content of the product and cause adverse effects on subsequent processing

The patent CN103923682A uses coal liquefaction refined asphalt as raw material, high molecular polymer as additive, and co-carbonization method to prepare mesophase pitch. Although the fluidity of the system has been improved and streamlined mesophase pitch has been obtained, the molecular structure of these additives It is very different from the polycyclic aromatic hydrocarbons in asphalt. After a series of treatments such as molding, carbonization and graphitization, defects such as pores may appear

Patent CN108485694A uses refined coal tar pitch as raw material and mesophase pitch as additive to prepare high-quality mesophase pitch through co-carbonization method. Although the reaction process is accelerated and a wide-area streamlined mesophase pitch product is obtained, the price of the additive is expensive and the production higher cost

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