METHOD FOR PREEXTRACTION OF HEMICELLULOSE THROUGH USING CONTINUOUS PREHYDROLYSIS AND STEAM EXPLOSION PRETREATMENT PROCESS

摘要

PROBLEM TO BE SOLVED: To extract carbon sugars from cellulosic biomass feed stocks.SOLUTION: The method includes: pretreating and hydrolyzing the feed stock 14 in a first pressurized reactor 12; discharging the feed stock from the first pressurized reactor to a pressurized sealing device 18; maintaining a vapor phase in the first pressurized reactor by injecting steam 13 into the first pressurized reactor, wherein the injected steam provides heat energy to the feedstock in the first pressurized reactor; washing the feed stock in a downstream region of the first pressurized reactor or the pressurized sealing device; draining a liquid including dissolved hemi-cellulosic material extracted from the feed stock from at least one of the first pressurized reactor and the pressurized sealing device; discharging the feed stock from the pressurized sealing device to a second pressurized reactor 16, wherein the feed stock is maintained at a higher pressure in the second pressurized reactor than in the first pressurized reactor; in the second pressurized reactor, infusing steam or water vapor into cells of the feed stock to be impregnated, and rapidly releasing the pressure to cause steam expansion in the cells of the feed stock and refine the feed stock.