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Research progress on the properties and applications of direct liquefaction residue of coal

2021 No. 05
579
495
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Authors:
ZHANG Yajie
XUE Yongbing
LIU Zhenmin
Abstract:

In the process of direct coal liquefaction,about 30% of coal liquefaction residues are produced by vacuum distillation. The coal direct liquefaction residues are mainly composed of unseparated heavy oil,unconverted coal,catalysts and other organic and inorganic substances. The development of coal direct liquefaction residues efficient and clean utilization methods are conducive to the rational application of coal resources and the improvement of the integrity and cost of coal liquefaction. This article mainly introduces the composition and structure of coal direct liquefaction residue,and the chemical composition of organic asphaltene,pre-asphaltene,organic macromolecular residue,inorganic ash residue and catalyst in coal direct liquefaction residue are introduced in detail. Through different ways of extraction,high-efficiency extraction and application of coal liquefaction residues can be achieved.The article systemly introduces the contents of coal direct liquefaction residues in gasification hydrogen production,gasification pulping,co-gasification process and gas discharge,etc. The pyrolysis of coal direct liquefaction residues can produce coal tar,and the co-pyrolysis method changes the structure of coal tar and improves the yield of coal tar. The coal direct liquefaction residue as a carbon product can provide a carbon source for it,and the inorganic catalyst in the coal direct liquefaction residue promotes the formation of new carbon materials. The structure of the coal direct liquefaction residue is similar to the structure of natural lake asphalt,and it is a potential asphalt modifier. The modification effect of each component on petroleum asphalt is analyzed by family composition to achieve the modification of petroleum asphalt. Through the compatibility evaluation method,the modification performance of coal direct liquefaction residue is further improved. The application of coal direct liquefaction residue is further prospected. However,a considerable part of the research on the properties and applications of coal direct liquefaction residues is still in the experimental research stage,and there are many problems in the extraction and application stages of coal direct liquefaction residues.

Keywords:
coal direct liquefaction residue
structure
gasification
pyrolysis
carbon material
asphalt modifier
Citation format:
张雅婕(1995—),女,山西汾阳人,硕士研究生,研究方向为煤炭洁净转化、石油沥青改性。E-mail:1055568784@qq.com。通讯作者:薛永兵,教授,研究方向为煤炭洁净转化、石油沥青改性。E-mail:tykjdxxyb@163.com
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About Journal

  • Executive director

    China Coal Science and Industry Group Co., Ltd

  • Sponsored by

    Coal Science Research Institute Co., Ltd
    Coal Industry Clean Coal Engineering
    Technology Research Center

  • Editor in Chief

    XIE Qiang

  • Vice Editor-in-Chief

    YU Chang
    SHI Yixiang
    ZHAO Yongchun
    DUAN Linbo
    CAO Jingpei
    ZENG Jie

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    Monthly

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    1006-6772

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    11-3676/TD

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