1-3-4 Hydro-liquefaction of low-molecular-weight fraction prepared from low-rank coal or biomass waste by degradative solvent extraction

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In our previous work we have presented a degradative solvent extraction method to upgrade and separate low-rank coals or biomass wastes into three solid fractions at temperature lower than 350℃. 26.3-56.2% of carbnon were converted into low-molecular-weight fraction (termed soluble), which have molecular weight of around 300, and were free from moisture and ash. In this work the solubles obtained from low-rank coal and biomass waste extraction were hydro-liquefied at lower than 400℃ by using iron hydroxide and sulfur as catalyst and tetralin as solvent at the hydrogen pressure of only 2 MPa (at room temperature). Results showed that the oil (hexane soluble excluding water) yields reached more than 60% on carbon basis. Carbon and oxygen contents of the oils obtained from the solubles were respectively higher and lower than those obtained from their parent materials. Furthermore, H2 consumptions of solubles hydro-liquefaction were rather lower than those of their parent materials hydro-liquefaction. Thus, the combination of our proposed degradative solvent extraction method and hydro-liquefaction of solubles under mild condition may be a promising technology for high quality liquid fuel production from low-rank coals or biomass wastes.
2012-07-30