Method for producing needle coke by utilizing delay coking of coal tar

Abstract

The invention discloses a method for producing needle coke by utilizing delay coking of coal tar. The method comprises the following steps of: putting fraction gasified tar into a coking fractionator, countercurrently contacting with high-temperature oil gas from a coking tower, carrying out heat exchange and eluting coke powder, and simultaneously separating to obtain light fraction, intermediate fraction and tail oil, wherein the intermediate fraction is used as a coking raw material to produce the needle coke with anisotropic optical structure under the process condition of being suitable for producing the needle coke. In the method, the separating treatment is carried out on the fraction gasified tar without an independent fractionator, and the high-temperature oil gas from the cokingtower is simultaneously separated in the coking fractionator, not only the flow is simple, the investment is saved, but also the light fraction and the tail oil which are not beneficial to producing the needle coke in the fraction gasified tar can be simultaneously separated out, and the obtained needle coke has high yield and good quality.

Description

technical field [0001] The invention belongs to a process method for preparing needle coke. Specifically, it is a method of producing needle coke by using a delayed coking process, and at the same time obtains light distillate oil as a by-product. Background technique [0002] Needle coke is the main raw material for producing high-power and ultra-high-power graphite electrodes, and its economic value is very high. The main method of producing needle coke is the delayed coking process. The most critical issue in the production of needle coke is to pretreat the raw material to remove the components and impurities in the raw material that are unfavorable to the production of needle coke. [0003] At present, the conventional raw materials suitable for the production of needle coke are heavy petroleum raw materials with high aromatic content, low colloid and asphaltene content, and low sulfur content, such as pyrolysis tar, catalytic cracking clarified oil, and extracted oil ...

AI Technical Summary

Problems solved by technology

The above method still requires a special coal tar raw material pretreatment device, the process is complicated and the investment is large

In addition, the above method is mainly to remove quinoline insolubles and impurities in coal tar, and when producing needle coke, some components with higher cracking reactivity and higher polymerization reactivity will also degrade the needle coke. The formation of

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