METHOD FOR RECOVERING HYDROLYSIS PRODUCTS

摘要

An improved method for treating lignocellulosic material, including a prehydrolysis-mass transfer process, which produces a concentrated hydrolysate volume following steam hydrolysis. The improved process comprises the heating of the digester and chip content by direct steam to the required hydrolysis temperature, the introduction of a volume of washing liquid to the digester and the discharge of said volume of liquid through the opposite end of the digester. Subsequently, the cooking process may start. The volume of washing liquid is sufficiently small to enable the recovery of a hydrolysate solution concentrated enough to make economic utilization of the hydrolysis products possible.