Coal based needle coke material pretreatment process

Abstract

The invention belongs to the technical field of preparation of coal based needle coke, and particularly relates to a coal based needle coke material pretreatment process, comprising the following steps: jointly stirring the cola based needle coke material, coal based solvent and petroleum based solvent, settling, dividing into a heavy phase and a light phase, pumping out the heavy phase and sending to the outside, distilling the light phase, wherein one part of gaseous phase after distillation is taken as overhead reflux, the other part is taken as a circulating solvent and returns to a mixingtank; enabling quinoline insoluble pitch and hydrogen-donor solvent to generate hydrogenation reaction in a hydrogenation reactor, sending the material after hydrogenation into a rectifying tower, wherein one part is taken as tower bottom reflux, and the other part is sent into the mixing tank at the bottom of the rectifying tower; cooling part of dehydrogenation solvent gaseous phase by a condenser at the top of the rectifying tower and then flowing into a tank at the top of the rectifying tower, wherein one part is taken as rectifying tower top reflux, the other part is heated by a heatingfurnace together with hydrogen and then sent into a hydrogen-donor solvent hydrogenation reactor, the hydrogen-donor solvent after re-hydrogenation is divided into gaseous phase circulating hydrogen and liquid phase circulating hydrogen-donor solvent by a gas-liquid separator.

Description

technical field [0001] The invention belongs to the technical field of coal-based needle coke preparation, and in particular relates to a coal-based needle coke raw material pretreatment process. Background technique [0002] Needle coke is a high-quality carbon material with the advantages of low ash, low thermal expansion, high conductivity, and high anisotropy. It is widely used in many fields such as high-power / ultra-high-power graphite electrodes, lithium battery negative electrode materials, and special graphite materials. . According to different raw materials, it can be divided into coal-based needle coke and oil-based needle coke. At present, the pretreatment methods of coal-based needle coke raw materials include solvent method, reforming method, centrifugation method, etc. These methods cannot effectively remove heteroatoms such as sulfur and nitrogen in the raw material, and directly affect the sulfur content of needle coke products, Key indicators such as nitr...

AI Technical Summary

Problems solved by technology

[0006] In order to solve the technical problems such as the difficulty of separating the suspended bed catalyst powder in the process of catalytic hydrogenation of the raw material pitch of coal series needle coke, the infiltration of heavy metals into the pitch, and the easy deposition of pitch on the surface of the fixed bed catalyst, resulting in coking and deactivation, the invention provides a coal It is a needle coke raw material pretreatment process, especially a coal-based needle coke raw material pretreatment process with solvent refining and hydrogenation processes, which realizes the long-term hydrogenation of coal-based needle coke raw material pitch without catalysts. Cycle operation, and couple the dehydrogenation and hydrogenation of the hydrogen-donating solvent to establish an oxygen-donating solvent production and circulation system

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