Patent ID: 6248208
Filing Date: 2001-06-19
Classification: D21C

Abstract:
A system for treating cellulosic fibrous material to continuously produce chemical pulp, said system comprising;a chip bin with steaming for removing air from the comminuted cellulosic fibrous material and preheating the material to a temperature above ambient;a first vessel for soaking comminuted cellulosic material from said means for removing air therefrom;means for removing a first liquid from said first vessel, the first liquid containing dissolved lignin and other organic solids, and replacing the first liquid in the first vessel with a second liquid having a lower content of dissolved lignin and other organic solids than the first liquid;a continuous digester for cooking the cellulosic fibrous material from said first vessel; andmeans for transferring the cellulosic material from said first vessel to said digester, and whereinsaid chip bin and first vessel are above said transferring means, and said transferring means is above ground level and consists essentially of a pump, being devoid of a high pressure feeder.