Patent ID: 8734612
Filing Date: 2014-05-27
Classification: D21C,D21D,D21H

Abstract:
1. A method for processing pulp-containing organic material that has undergone pre-hydrolysis in a reaction vessel, as part of a kraft process for producing dissolving pulp, comprising: adding a first quantity of white liquor to the reaction vessel as a first neutralization fluid to only partially fill available space within the reaction vessel with the white liquor, while maintaining the vessel at a temperature of between 120° C. and 180° C., the white liquor constituting a first alkaline solution; after adding the first quantity of white liquor, adding a second alkaline solution other than white liquor or only partially containing white liquor, and containing a filtrate that has not been treated to decompose or remove hemicelluloses, to the reaction vessel to constitute, along with the first quantity of white liquor, a complete neutralization fluid present in the reaction vessel; displacing the neutralization fluid with one or more cooking fluids suitable for carrying out kraft cooking; cooking the pulp-containing organic material in the reaction vessel; and discharging the cooked pulp from the reaction vessel.