US 12,234,602 B2
Apparatuses, methods and systems for yield increase in a kraft cooking plant
Vinicius de Oliveira Salaroli, Bahia (BR); and Nils Daniel Trolin, Bahia (BR)
Assigned to Bracell Bahia Specialty Cellulose SA, Camaçari (BR)
Filed by Bracell Bahia Specialty Cellulose SA, Bahia (BR)
Filed on May 17, 2022, as Appl. No. 17/746,826.
Prior Publication US 2023/0374730 A1, Nov. 23, 2023
Int. Cl. D21C 1/04 (2006.01); D21C 1/02 (2006.01); D21C 3/02 (2006.01); D21C 7/06 (2006.01)
CPC D21C 1/04 (2013.01) [D21C 1/02 (2013.01); D21C 3/022 (2013.01); D21C 7/06 (2013.01)] 21 Claims
OG exemplary drawing
 
1. A process for increasing the pulp yield in a kraft cooking plant, comprising: utilizing a stream of acidic hydrolysate from an adjacent prehydrolysis kraft process producing dissolving wood pulp, wherein the kraft cooking plant is a parallel cooking plant producing conventional kraft pulp;
wherein the stream of acidic hydrolysate, which contains dissolved hemicelluloses and is produced by prehydrolysis of wood chips in water phase, is reutilized in the kraft cooking plant; and
wherein the wood chips in the kraft cooking plant are pretreated and impregnated with the acidic hydrolysate prior to an alkaline cooking process.