Co-production process of needle coke, mesophase carbon microspheres and high-quality pitch

Abstract

The invention relates to a co-production process of needle coke, mesophase carbon microspheres and high-quality asphalt. The heavy phase pitch produced by the pretreatment of raw material asphalt is mixed with the raw material asphalt to produce mesophase carbon microspheres, and the mesophase carbon microspheres are produced. The by-product pitch of the pellets is mixed with the refined pitch obtained from raw pitch pretreatment as needle coke raw material, including raw pitch pretreatment, polymerization reaction, polymerization product separation and drying, by-product pitch processing, coking and calcination processes. Compared with the prior art, the beneficial effects of the present invention are as follows: 1) the coal tar pitch has high processing degree, low cost, many varieties and high added value of products, and realizes the maximization of economic benefits; 2) there is no waste discharge in the whole production process, Realize the optimization of environmental benefits; 3) The process is flexible and the operation is simple, realizing the efficient combination of needle coke, mesocarbon microspheres and high-quality asphalt production technology; 4) The product index is flexible and adjustable, which can adapt to market changes in time and improve the enterprise's resistance market risk capacity.

Description

technical field [0001] The invention relates to the technical field of coal tar pitch deep processing, in particular to a co-production process of needle coke, mesocarbon microspheres and high-quality pitch. Background technique [0002] Coal tar pitch is a bulk product separated from coal tar processing, accounting for about 50% to 60% of coal tar, and its processing and utilization level is very important to the entire coal tar processing. Coal tar pitch can be processed to obtain products with different uses, such as binders and impregnating agents used in the production of carbon materials, needle coke, mesophase carbon microspheres, carbon fibers, anti-corrosion materials, fuels, etc. These products are used in metallurgy, carbon , chemical industry, building materials and other fields play a role that cannot be ignored. However, with the development of coal chemical industry, the increasing output of coal tar pitch makes the problems in its processing and utilization ...

AI Technical Summary

Problems solved by technology

The main problems in my country's coal tar pitch processing are insufficient processing depth, single product types, and poor ability to resist market risks.

[0003] At present, the production of coal-based needle coke mainly adopts solvent extraction separation, centrifugation and other methods to purify the raw materials, separate the quinoline insoluble (QI) in the raw coal tar pitch, and obtain refined pitch with very low QI content and QI-rich The by-product asphalt is refined asphalt and then coked and calcined to obtain needle coke, but the by-product asphalt rich in QI has not been rationally and effectively utilized, but is used as low-value-added, low-quality binder asphalt and cheap external sales, and even cause a backlog of by-products

In addition, for enterprises that use coal tar pitch as raw material to produce mesophase carbon microspheres, the yield of mesophase carbon microspheres is generally 20% to 50%, and most of the rest is by-product pitch. The main characteristic of the by-product pitch is the QI content It is very low and has excellent application value, but it has not been effectively and rationally processed and utilized at present

[0004] In short, at present, the depth of coal tar pitch processing is not deep enough, and the product is single. It is one of the main factors for the low profit margin of related enterprises, and it is also one of the factors for their poor ability to resist market risks.

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