Influence of donor amount in the hydrogen-transfer liquefaction of Australian brown coal

Isao Mochida, Atsushi Yufu, Kinya Sakanishi, Yozo Korai

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Abstract

Effects of tetrahydrofluoranthene (4HFL) concentration on the product composition in the liquefaction of an Australian brown coal at 450 °C were studied, using a coal-solvent weight ratio of 1:3 under low nitrogen pressure to optimize the conditions. Pure 4HFL solvent liquefied the coal very rapidly, a longer reaction time markedly increasing the yield of gaseous product as well as the total yield of oil and asphaltenes. Although a reduction in the 4HFL content of the solvent reduced the rates of liquefaction for both gas and liquid products, 4HFL contents of 75 and 50 mol% provided more favourable product compositions (high yield, > 80% of oil plus asphaltenes and low yields of preasphaltenes and gaseous products). In liquefaction of the deashed coal with 75 % 4HFL, the product composition was further improved by using a shorter reaction time. Several roles of donors in the liquefaction process are proposed to explain the product composition and rate of liquefaction.

Original languageEnglish
Pages (from-to)114-118
Number of pages5
JournalFuel
Volume67
Issue number1
DOIs
Publication statusPublished - Jan 1 1988

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All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Organic Chemistry

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