Coal Liquefaction Liquid Quality: Influence of Temperature and Heating Approach on Solvent Extraction of Coal

  • Author / Creator
    Apan, Ioan-Tudor
  • This project evaluated the impact of reaction temperature and of additional heating steps on the quality of the liquids obtained from solvent extraction of a lignite coal with tetralin. The points of focus were the coal liquid yield, physical properties, aromatic content and iron pyrite conversion. All experiments were carried out in micro-batch reactors, nitrogen atmosphere and autogenous pressure, with a coal to solvent ratio of 1:3. First, the influence of extraction temperature was investigated by performing extraction at different temperatures in the range 340 to 415 ⁰C, for 1 h. The second part of the project involved 9 different heating scenarios combining a low temperature step in the range 100 to 200 ⁰C followed by a high temperature step in the range 350 to 415 ⁰C. It was found that performing liquefaction at lower temperatures is beneficial in terms of coal liquid density, aromatic content and iron pyrite conversion, while higher temperatures favor a better yield, lower coal liquid boiling points and the formation of aromatics with higher aliphatic hydrogen content. Adding an additional low temperature step led to higher liquid yields, lower coal liquid boiling points and higher aliphatic hydrogen content of the aromatics contained in the coal liquids, while the coal liquid density remained predominantly unchanged.

  • Subjects / Keywords
  • Graduation date
    Fall 2014
  • Type of Item
  • Degree
    Master of Science
  • DOI
  • License
    This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for non-commercial purposes. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.