Process for preparing needle coke raw material by using medium and low temperature coal tar and high temperature pitch

Abstract

The invention relates to a process for preparing a needle coke raw material by using medium and low temperature coal tar and high temperature pitch, which comprises the following steps: 1) distilling the medium and low temperature coal tar, separating to obtain heavy distillate with the temperature more than 350DEG C; 2) sending the heavy distillate of the medium and low temperature coal tar in a reactor, under the existence of a catalyst, introducing hydrogen in the reactor, performing hydropyrolysis on the heavy distillate, wherein the catalyst is a Fe catalyst and the mass of the catalyst accounts for 0.01-3% of mass of the heavy distillate; the pressure during the hydropyrolysis is 7-12 MPa and the temperature is 350-550 DEG C; 3) sending the products after hydropyrolysis in the step 2) in a separator, and separating to obtain lower oil and higher oil; and 4) performing physical separation on the higher oil, and removing the catalyst. According to the hydropyrolysis treatment of the medium and low temperature coal tar, the content of condensed polycyclic aromatic hydrocarbons can be greatly increased and the raw material suitable for preparing needle coke can be obtained.

Description

technical field [0001] The invention belongs to the field of coal chemical industry, and in particular relates to a process for preparing coal-based needle coke raw materials from coal tar. Background technique [0002] Needle coke is a high-quality material for manufacturing high-power and ultra-high-power electrodes. Graphite electrodes made of needle coke have strong thermal shock resistance, high mechanical strength, good oxidation performance, low electrode consumption and large allowable current density, etc. advantage. At present, needle coke has been widely used in high-tech fields such as electric furnace steelmaking, manufacturing deceleration materials for nuclear reactors, and manufacturing ultra-high-power electrodes for rocket launches. [0003] The needle coke currently produced can be divided into petroleum-based needle coke and coal-based needle coke according to the different raw materials used, but both coal-based and petroleum-based needle coke have the ...

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is that in the prior art, medium and low temperature tar cannot be used to prepare needle coke, and a process for preparing needle coke raw material by using medium and low temperature tar and high temperature pitch is provided, which broadens the range of needle coke raw materials range, while reducing the cost of needle coke preparation, it also provides a new way to solve the problem of medium and low temperature tar treatment