US 12,305,332 B2
Method for producing cellulose pulp, cellulose pulp and use thereof, paper
Otávio Mambrim Filho, Aracruz (BR); and Leonardo Alves De Melo, São José dos Campos (BR)
Assigned to Suzano S.A., São Paulo (BR)
Filed by Suzano S.A., São Paulo (BR)
Filed on Jan. 4, 2022, as Appl. No. 17/646,946.
Application 17/646,946 is a division of application No. 16/067,234, granted, now 11,248,344, previously published as PCT/BR2016/050355, filed on Dec. 27, 2016.
Claims priority of application No. BR102015032911-3 (BR), filed on Dec. 29, 2015.
Prior Publication US 2022/0127789 A1, Apr. 28, 2022
Int. Cl. D21H 11/20 (2006.01); D21C 3/02 (2006.01); D21C 5/00 (2006.01); D21C 9/10 (2006.01); D21C 9/12 (2006.01); D21C 9/18 (2006.01); D21H 11/04 (2006.01); D21H 11/12 (2006.01); D21H 17/00 (2006.01); D21H 17/21 (2006.01); D21H 17/28 (2006.01); D21H 17/29 (2006.01); D21H 21/10 (2006.01); D21H 21/18 (2006.01); D21H 23/04 (2006.01)
CPC D21H 11/20 (2013.01) [D21C 3/02 (2013.01); D21C 5/00 (2013.01); D21C 9/10 (2013.01); D21C 9/12 (2013.01); D21C 9/123 (2013.01); D21C 9/18 (2013.01); D21H 11/04 (2013.01); D21H 11/12 (2013.01); D21H 17/005 (2013.01); D21H 17/21 (2013.01); D21H 17/28 (2013.01); D21H 17/29 (2013.01); D21H 21/10 (2013.01); D21H 21/18 (2013.01); D21H 23/04 (2013.01)] 18 Claims
OG exemplary drawing
 
1. Cellulose pulp obtained by a process comprising the steps of:
a) treating the cellulosic feedstock through a chemical or semi-chemical pulping process to produce brown cellulose pulp;
b) bleaching the brown cellulose pulp through a bleaching sequence to obtain a white slurry pulp;
c) adding a carbohydrate-based polymer consisting of starch to the white slurry pulp, wherein the dosage of said polymer ranges from 2 to 12 kg/ton of cellulose pulp;
d) adding at least one enzyme to the white slurry pulp already doped with the carbohydrate-based polymer to form a doped white slurry pulp, wherein the addition of the at least one enzyme (EZ) takes place according to the following conditions:
i. reaction temperature between 4° and 90° C.;
ii. reaction pH between 3.0 and 9.0;
iii. reaction time between 10 and 300 minutes;
iv. enzyme amount between 10 and 200 g of the at least one enzyme per ton of cellulose pulp;
e) conveying the doped white slurry pulp to and through a reaction tower before a drying machine; and
f) drying the doped white slurry pulp, and denaturing the at least one enzyme, to obtain the cellulose pulp; and
wherein the at least one enzyme comprises a cellulase; and
wherein the cellulose pulp has a zeta potential of about −63 mV to about −66 mV.
 
10. Cellulose pulp obtained by a process comprising the steps of:
a) treating the cellulosic feedstock through a chemical or semi-chemical pulping process to produce brown cellulose pulp;
b) bleaching the brown cellulose pulp through a bleaching sequence to obtain a white slurry pulp;
c) adding at least one enzyme to the white slurry pulp, wherein the addition of the at least one enzyme (EZ) takes place according to the following conditions:
i. reaction temperature between 4° and 90° C.;
ii. reaction pH between 3.0 and 9.0;
iii. reaction time between 10 and 300 minutes;
iv. enzyme amount between 10 and 200 g of the at least one enzyme per ton of cellulose pulp;
d) adding a carbohydrate-based polymer consisting of a starch to the white slurry pulp already doped with the at least one enzyme to form a doped white slurry pulp, wherein the dosage of said polymer ranges from 2 to 12 kg/ton of cellulose pulp;
e) conveying the doped white slurry pulp to and through a reaction tower before a drying machine; and
f) drying the doped white slurry pulp, and denaturing the at least one enzyme, to obtain the cellulose pulp;
wherein the at least one enzyme comprises a cellulase; and
wherein the cellulose pulp has a zeta potential of about −63 mV to about −66 mV.