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Bench-scale studies of biomass liquefaction with prior hydrolysis

The liquefaction experiments were conducted batchwise using autoclaves. The oils produced in batch experiments were poor in quality, i.e., they solidified at room temperature and contained excessive amounts of acetone insoluble material, compared to oils produced in flow mode at the biomass liquefaction test facility at Albany, Oregon and in the process evaluation unit of LBL. Possible causes of the differences in the quality and yields of oils are differences in the synthesis gas pressure initially imposed, and the rate of heating to the reaction temperature during which irreversible reactions can take place, as well as differences in gas/liquid contacting.