A method and system for preparing mesophase pitch

By pretreating ethylene tar and performing a multi-step reaction, the problem of coke formation during the preparation of mesophase pitch from ethylene tar was solved, resulting in the production of high-quality mesophase pitch, which improved the utilization value of ethylene tar and enabled the production of high-performance carbon fibers.

CN118685195BActive Publication Date: 2026-01-02CHINA PETROLEUM & CHEMICAL CORP +1
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Patent Information

Application Number
CN202310294278.3
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-03-24
Publication Date
2026-01-02
Estimated Expiration
2043-03-24

AI Technical Summary

Technical Problem

How to avoid generating coke and other substances that affect product quality when preparing mesophase pitch from ethylene tar as raw material, and ensure the spinnability and product uniformity of mesophase pitch.

Method used

Ethylene tar is treated in the presence of a catalyst using a pretreatment unit to separate it into a first light oil and a first heavy oil. The first light oil reacts in the presence of a first additive and then contacts with a carrier gas to form mesophase asphalt. The thermal stability is improved by low-temperature catalytic condensation and separation operations, and the second light oil and heavy oil are recycled.

Benefits of technology

High-quality mesophase pitch was prepared, which improved the added value of ethylene tar. The softening point of the product was adjustable, the mesophase content was greater than 95%, and it had good spinnability. The carbon fibers prepared had few defects and high tensile strength.

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Abstract

The application discloses a mesophase pitch preparation method and a preparation system. The preparation method comprises the following steps: (1) separating liquid-phase materials obtained after ethylene tar treatment to obtain first light oil and first heavy oil; (2) the first light oil enters a first reaction unit to react in the presence of a first additive to obtain a reaction stream; and (3) the obtained reaction stream enters a second reaction unit to react with a carrier gas, and mesophase pitch and an oil-phase stream are obtained after treatment. The preparation system comprises a pretreatment unit, a first separation unit, a first reaction unit, a second reaction unit and a second separation unit. The method provides a high-value conversion process for ethylene tar, and the obtained mesophase pitch product has excellent spinnability, and the value of the ethylene tar is greatly improved.
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