Preparation method of needle coke

Abstract

The invention discloses a method to make needle coke. The raw material and light component oil would be sent into the first settlement separate tower after being mixed. The bottom of static separate tower would discharge dregs that are mixed by insoluble substance containing quinoline and polarity collective constituent. The top of the tower would flow out refine asphaltum oil, which would be sent to thermal polymerization reactor to take thermal polymerization reaction with light component oil from the second settlement separate tower. The light component oil would take circular reaction, and the heavy component rich in intermediate phase would take the growth of the intermediate phase in directional grower. The needle coke would be gained after removing solvent oil from reaction product and taking intermediate phase stability process in charring furnace. The invention has advantages of easy to manufacture, high efficiency, and good optical texture.

Description

technical field [0001] The invention relates to a method for preparing needle coke with medium-temperature coal tar pitch, soft pitch or coal tar fraction as raw materials. Background technique [0002] Needle coke is the key material for the production of high-power and ultra-high-power graphite electrodes, as well as the basic raw material for the production and preparation of new carbon materials. Preparation of needle coke with pitch as raw material In the process of thermal polymerization of pitch, the generation of mesophase goes through three stages, namely, the emergence, growth and fusion of seed crystals. The key to the preparation of needle coke lies in the liquid phase carbonization of pitch. During the solid phase transformation process, the mesophase small spheres are formed, enlarged, merged and aligned, and finally anisotropic fibrous coke is formed. Chinese invention patent, patent number 01140582.1, announcement number CN1169911C, titled "A Method for Prep...

AI Technical Summary

Problems solved by technology

The above-mentioned invention can produce needle coke but has the following disadvantages: 1. The raw material used in the invention is refined oil that does not contain primary quinoline insolubles, and it is not suitable for coal-based by-products, coal tar or petroleum-based residues, asphalt, etc. Raw materials are used to prepare needle coke, which limits the scope of application of the invention; 2. The invention requires heating the material from room temperature to 480-550°C within 2-30 seconds, which is difficult to achieve under industrial conditions

Although the existing technology can produce needle coke products, the reaction raw materials are single and the process conditions are harsh, which cannot meet the industrial requirements for large-scale production of needle coke with a high degree of orientation.

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