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US 2019/0062999 A1Published application
Method for producing cellulose pulp, cellulose pulp and use thereof, paper
AssigneeSuzano S.A.
InventorsOtávio MAMBRIM FILHO, Leonardo ALVES DE MELO
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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.
Claims16
Process for producing cellulose pulp from cellulosic feedstock characterized by 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.
8 more elements
Process for producing cellulose pulp from cellulosic feedstock characterized by 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 (S) the doped white slurry pulp to obtain the cellulose pulp.
8 more elements
Dependencies are inferred from the claim text.