Preparation method and preparation system of mesophase pitch

Abstract

The invention discloses a preparation method and a preparation system of mesophase pitch, and the preparation method comprises the following steps: (1) heating a first raw material, feeding the first raw material into a first reaction unit, and reacting to obtain a first reaction material flow; (2) heating a second raw material, feeding the heated second raw material and the first reaction material flow into a second reaction unit, and reacting to obtain a second reaction material flow; and (3) enabling the second reaction material flow to enter a third reaction unit after being rapidly cooled to be in contact with carrier gas for treatment, and obtaining an oil-gas product and mesophase pitch after treatment. The preparation system comprises a heating unit, the first reaction unit, the second reaction unit, a quenching device, the third reaction unit and a fractionation system. The preparation system of the mesophase pitch can stably run for a long period, and the mesophase pitch obtained by the preparation method is good in quality controllability and high in yield.

Description

technical field [0001] The invention relates to a preparation method and a preparation system of mesophase pitch. Background technique [0002] Mesophase pitch is a kind of nematic liquid crystal obtained by means of thermal condensation, catalytic modification, hydrogenation modification, solvent extraction, etc., using coal series, petroleum series, high molecular polymers and other aromatic compounds as raw materials. It is a mixture of many flat disk-shaped condensed aromatic hydrocarbons with optical anisotropy. Due to the wide source of raw materials and low price, mesophase pitch has the advantages of excellent performance, strong processability and high added value, and is recognized as a high-quality precursor for various carbon materials (such as high modulus carbon fiber, needle coke, mesophase Pitch-based carbon foam, electrode materials, etc.), these materials are widely used in national defense, aerospace, civil industry and other fields. [0003] CN87103787 ...

AI Technical Summary

Problems solved by technology

[0006] To sum up, at present, one or a combination of thermal condensation polymerization, hydrogenation modification, catalytic modification and co-carbonization methods are used in the preparation process of mesophase pitch, and the process is relatively complicated.

Or use batch operation, the production efficiency is low, or use HF / BF 3 As a catalyst, it is highly corrosive and easy to cause corrosion to equipment; or co-carbonization of fractions with different properties, because the combination of additives and raw materials cannot be determined, after subsequent processing, carbonization, and graphitization, defects such as pores may appear. Affect the spinnability of mesophase pitch and the performance of carbon fiber

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