Method for preparing needle coke

Abstract

The invention discloses a method for preparing needle coke. The method comprises the following steps: firstly, coal tar is subjected to supercritical extraction and separation, a coal tar light component and a coal tar heavy component are obtained, the pretreated coal tar heavy component obtained after pretreatment of the coal tar heavy component is mixed with an oil-based raw material, the mixture enters a fluidized bed reactor, a liquid product after reaction is subjected to fractionation, and a light component and a heavy component are obtained; the light component is processed in a catalytic cracking device; the heavy component enters a coking device for coking reaction, and gas, coker gasoline, coker diesel oil, coker wax oil and needle coke are obtained after separation. The refinedmixed raw material obtained with the method has the advantages of low content of quinoline insolubles, low content of S and N impurities and the like, and the produced needle coke has the advantages of small thermal expansion coefficient, low sulfur content, low ash content and the like.

Description

technical field [0001] The invention relates to a method for preparing needle coke, in particular to a method for preparing needle coke with coal-based and oil-based mixed raw materials. Background technique [0002] Needle coke is a coke with special properties produced during the thermal conversion of coal-based or oil-based raw materials. Needle coke is an important raw material in the carbon industry, which has the advantages of low thermal expansion coefficient and good graphitization performance. After being broken, the shape is needle-like, and it has obvious fibrous structure and high anisotropy under the microscope. Power electrode steelmaking can improve steelmaking efficiency, reduce power consumption, and reduce steelmaking costs, and has significant economic and social benefits. [0003] Needle coke can be divided into coal-based needle coke and petroleum-based needle coke according to the source of raw materials. Petroleum-based needle coke is made of thermal...

AI Technical Summary

Problems solved by technology

[0006] Aiming at the defects in the preparation of needle coke from coal-based needle coke raw materials and oil-based needle coke raw materials in the existing process and the large increase in the content of quinoline insolubles when the two raw materials are mixed together to produce needle coke Problem, the present invention proposes a method for preparing needle coke by using coal-based needle coke raw materials and oil-based needle coke raw materials as mixed raw materials. The refined needle coke raw materials obtained by this method have low content of quinoline insolubles, The advantages of low S and N impurity content, good mutual compatibility of raw materials, etc., the obtained needle coke has the advantages of small thermal expansion coefficient, low sulfur content, low ash content, etc.

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