Process for producing needle coke by co-carbonization of aromatic oil and heavy coal tar

By using a co-carbonization process of aromatic oil and heavy coal tar, combined with temperature and pressure control and stepped nitrogen cooling, the problems of low quality and uneven cooling of traditional needle coke raw materials have been solved, and high-quality needle coke production has been achieved.

CN116042251BActive Publication Date: 2026-07-14SHANDONG YIDA NEW MATERIAL
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SHANDONG YIDA NEW MATERIAL
Filing Date
2023-01-06
Publication Date
2026-07-14

AI Technical Summary

Technical Problem

In existing technologies, the quality of traditional oil-based needle coke raw materials is not high, resulting in insufficient electrode flexural strength and easy cracking. Furthermore, uneven cooling by water cooling method leads to uneven coke particle size, which affects the quality of needle coke.

Method used

The co-carbonization process of aromatic oil and heavy coal tar is adopted. By controlling the temperature and pressure, combined with step-by-step nitrogen cooling, the reactivity and viscosity are controlled, promoting the growth of mesophase spheres, shortening the coking cycle, and improving the reactivity of raw materials.

Benefits of technology

It expands the source of needle coke raw materials, improves product quality, shortens the coking cycle, ensures good uniformity of coking cooling, and produces products with uniform strength, thus solving the problems of uneven quality and structure that exist in traditional methods.

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Abstract

The present application relates to the technical field of needle coke preparation, in particular to a process for producing needle coke by co-carbonization of aromatic oil and heavy coal tar, comprising the following steps: S1, adding aromatic oil into a coke tower, heating to a first temperature, and controlling the pressure value to be a first pressure; S2, continuously adding heavy coal tar into the coke tower, heating to a second temperature, and increasing the pressure to a second pressure to obtain needle coke; S3, continuously reacting the needle coke system at the second temperature, and then sequentially introducing nitrogen gas at a third temperature, nitrogen gas at a fourth temperature, and nitrogen gas at a fifth temperature into the system, and finally cooling the system by nitrogen gas at a sixth temperature to obtain needle coke. The present application expands the source of needle coke raw materials, improves the product quality, and shortens the reaction period.
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Citation Information

Patent Citations

  • Delayed coke calcination flue gas treatment and high-temperature needle coke cooling process

    CN114777506A

  • Method for preparing needle coke using petrolium and coal series raw material

    CN1418930A