# US 2022/0127789 A1 · Method for producing cellulose pulp, cellulose pulp and use thereof, paper

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- Number: US 2022/0127789 A1
- Document ID: US20220127789A1
- Status: Published application
- Kind: A1
- Application number: 17/646,946
- Filed: 2022-01-04
- Published: 2022-04-28
- Earliest claimed: 2015-12-29
- Assignees: Suzano S.A.
- Applicants: Suzano S.A.
- Inventors: Otávio MAMBRIM FILHO; Leonardo Alves De Melo
- Web page: https://patentgrep.com/patent/US20220127789A1

## CPC

- D21H 11/20: Chemically or biochemically modified fibres
- D21C 3/02: with inorganic bases or alkaline reacting compounds, e.g. sulfate processes
- D21C 5/00: Other processes for obtaining cellulose, e.g. cooking cotton linters (obtaining fibres for spinning D01C); {Processes characterised by the choice of cellulose-containing starting materials}
- D21C 9/10: Bleaching {; Apparatus therefor}
- D21C 9/12: with halogens or halogen-containing compounds (D21C9/16 takes precedence)
- D21C 9/123: {with Cl2O}
- D21C 9/18: De-watering (de-watering in general F26B); {Elimination of cooking or pulp-treating liquors from the pulp}(D21C9/002, D21C9/02 take precedence; paper-making machines D21F; strainers in digesters D21C7/00; presses in general B30B)
- D21H 11/04: Kraft or sulfate pulp
- D21H 11/12: Pulp from non-woody plants or crops, e.g. cotton, flax, straw, bagasse
- D21H 17/005: {Microorganisms or enzymes}
- D21H 17/21: of natural origin; Derivatives thereof
- D21H 17/28: Starch
- D21H 17/29: cationic
- D21H 21/10: Retention agents or drainage improvers
- D21H 21/18: Reinforcing agents
- D21H 23/04: Addition to the pulp; After-treatment of added substances in the pulp
- D21H: PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21C: PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR

## Abstract

The present invention relates to an enhanced process for the production of cellulose pulps with increased quality and applicability of said pulps, especially their physical resistance properties and degree of resistance to drainage, through an enzymatic treatment step comprised in the production process of said cellulose pulp, concomitantly with the polymer dosage based on carbohydrates.

## Claims

### Claim at position 1

1-10. (canceled)

### Claim 11

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, wherein the dosage of said polymer ranges from 2 to 12 kg/ton of cellulose pulp;
d) adding an enzyme or enzyme mixture to the white slurry pulp already doped with the carbohydrate-based polymer, wherein the addition of the enzyme (EZ) or enzyme mixture takes place according to the following conditions:
i. reaction temperature between 40 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 g of EZ and 200 g of EZ per ton of cellulose;
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 to obtain the cellulose pulp.

### Claim 12 (depends on 11)

The cellulose pulp of claim 11, wherein the bleached cellulose of the cellulose pulp has a tensile index ranging from 27.2 to 52.2 Nm/g.

### Claim 13 (depends on 11)

The cellulose pulp of claim 11, wherein the pulp has a tear index ranging from 4.5 to 6.5 Nm2/Kg in the bleached celluloses.

### Claim 14 (depends on 11)

A method of producing paper comprising a step of using the cellulose pulp of claim 11.

### Claim 15 (depends on 11)

A paper comprising the cellulose pulp of claim 11.

### Claim 16 (depends on 11)

The cellulose pulp of claim 11, wherein the cellulosic feedstock is a vegetable fiber.

### Claim 17 (depends on 16)

The cellulose pulp of claim 16, wherein the vegetable fiber is a short fiber.

### Claim 18 (depends on 11)

The cellulose pulp of claim 11, wherein the pulping process is a Kraft process.

### Claim 19 (depends on 11)

The cellulose pulp of claim 11, wherein bleaching comprises using an ECF or TCF bleaching sequence.

### Claim 20 (depends on 11)

The cellulose pulp of claim 11, wherein the addition of the enzyme (EZ) or enzyme mixture takes place according to the following conditions:
i. reaction temperature between 50 and 80° C.;
ii. reaction pH between 3.5 and 8.0;
iii. reaction time between 30 and 120 minutes;
iv. enzyme amount between 20 g of EZ and 100 g of EZ per ton of cellulose.

### Claim 21

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 an enzyme or enzyme mixture to the white slurry pulp and already doped with the carbohydrate-based polymer, wherein the addition of the enzyme (EZ) or enzyme mixture takes place according to the following conditions:
i. reaction temperature between 40 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 g of EZ and 200 g of EZ per ton of cellulose;
d) adding a carbohydrate-based polymer, 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 to obtain the cellulose pulp.

### Claim 22 (depends on 21)

The cellulose pulp of claim 21, wherein the bleached cellulose of the cellulose pulp has a tensile index ranging from 27.2 to 52.2 Nm/g.

### Claim 23 (depends on 21)

The cellulose pulp of claim 21, wherein the pulp has a tear index ranging from 4.5 to 6.5 Nm2/Kg in the bleached cellulose.

### Claim 24 (depends on 21)

A method of producing paper comprising a step of using the cellulose pulp of claim 21.

### Claim 25 (depends on 21)

A paper comprising the cellulose pulp of claim 21.

### Claim 26 (depends on 21)

The cellulose pulp of claim 21, wherein the cellulosic feedstock is a vegetable fiber.

### Claim 27 (depends on 26)

The cellulose pulp of claim 26, wherein the vegetable fiber is a short fiber.

### Claim 28 (depends on 21)

The cellulose pulp of claim 21, wherein the pulping process is a Kraft process.

### Claim 29 (depends on 21)

The cellulose pulp of claim 21, wherein bleaching comprises using an ECF or TCF bleaching sequence.

### Claim 30 (depends on 21)

The cellulose pulp of claim 21, wherein the addition of the enzyme (EZ) or enzyme mixture takes place according to the following conditions:
i. reaction temperature between 50 and 80° C.;
ii. reaction pH between 3.5 and 8.0;
iii. reaction time between 30 and 120 minutes;
iv. enzyme amount between 20 g of EZ and 100 g of EZ per ton of cellulose.