Abstract
Co-liquefaction of biomass and coal in supercritical water is proposed with the intention that hydrogen matching between biomass and coal takes place, resulting in enhanced coal liquefaction and preferable liquefaction products. A semi-batch packed-bed reactor is employed to co-liquefy cellulose utilized for a model compound of biomass and Ishikari coal in supercritical water at 673K and 25MPa. No interaction between coal and cellulose is observed for the production of residue and water-insoluble product, judging from the yield and its composition. On the contrary, the yield of the water-soluble product increased for the case of co-liquefaction. Both hydrogen to carbon ratio and oxygen to carbon ratio of the water-soluble product increased by co-liquefaction. The mechanism for this interaction is proposed based on the addition reaction of compounds derived from cellulose with coal-derived compounds to increase the recoverable yield of the water-soluble product.
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