No.34 Liquefaction of extracts obtained from low-rank coal and biomass waste by degradative solvent extraction

概要

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In our previous work we have developed a degradative solvent extraction method to obtain extracts with rather high yields from low-rank coals and biomass wastes at lower than 350℃ in N2. One of the extracts had molecular weight of around 300 and was expected to be liquefied easily under relatively mild conditions. In this work the extracts, obtained from lowrank coal and biomass wastes, were liquefied at lower than 400℃ under the H2 pressure of as low as 2 MPa (at room temperature). Their parent materials were also liquefied for comparison purpose. The results showed that the oil (hexane soluble excluding water) yields reached to higher than 60% at 400℃. Oxygen contents of the oils obtained from the extracts were much lower than those obtained from their parent materials. Furthermore, H_2 consumptions and CO_2 emissions of the extract liquefactions were rather lower than those of their parent material liquefactions. Thus, the combination of our proposed degradative solvent extraction method and liquefaction of the extract under mild condition may be a promising method for liquid fuel production from low-rank coals or biomass wastes.
2012-10-15