Method and a system for manufacturing cellulose material

Patent metadata

Field	Value
Publication number	US-9611586-B2
Application number	US-201214359507-A
Country	US
Kind code	B2
Filing date	Nov 23, 2012
Priority date	Nov 23, 2011
Publication date	Apr 4, 2017
Grant date	Apr 4, 2017

Abstract

The invention relates to a method for manufacturing cellulose material, the method comprising introducing cellulose fibers as raw material pulp ( 1 ) to a system, adding an alkalizing agent into the system in order to absorb the alkalizing agent into the cellulose fibers ( 1 ), adding an anionic agent into the system in order to absorb said agent into the cellulose fibers ( 1 ), feeding the cellulose fibers ( 1 ) to a sieve plate press ( 6 ), performing a reaction between the cellulose fibers and the anionic agent at least partly in the sieve plate press ( 6 ) in order to produce anionized cellulose fibers having a degree of substitution between 0.05 and 0.35, wherein the reaction is performed at least partly at a consistency of at least 50%. In addition, the invention relates to a system for manufacturing cellulose material and to fibril cellulose produced from anionized cellulose fibers.

First claim

The invention claimed is:

1. A method for manufacturing cellulose material, the method comprising:
introducing cellulose fibers as cellulose raw material to a system,
adding an alkalizing agent into the system in order to absorb the alkalizing agent into the cellulose fibers,
adding an anionic agent into the system in order to absorb said agent into the cellulose fibers, said anionic agent being monochloracetic acid or a salt thereof,
feeding the cellulose fibers to a sieve plate press,
performing a reaction between the cellulose fibers and the anionic agent at least partly in the sieve plate press in order to produce water-insoluble carboxymethylated cellulose fibers having a degree of substitution between 0.05 and 0.35 carboxymethyl groups per anhydroglucose unit, wherein the reaction is performed at least partly at a consistency of at least 50%.

2. The method according to claim 1 , further comprising:
refining the carboxymethylated cellulose fibers in a refiner in order to produce fibril cellulose material.

3. The method according to claim 1 , wherein the alkalizing agent is sodium hydroxide and the anionic agent is sodium monochloroacetate.

4. The method according to claim 1 , wherein the addition of the alkalizing agent and the anionic agent is carried out in a fluidized bed type mixer.

5. The method according to claim 1 , wherein the amount of the alkalizing agent is between 1 and 20 w-%, from dry weight of the used cellulose raw material.

6. The method according to claim 1 , wherein the amount of the anionic agent is between 1 and 30 w-%, from dry weight of the used cellulose raw material.

7. The method according to claim 1 , wherein at least 80% of water used in the method is supplied together with chemicals to be added into the system.

8. The method according to claim 1 , wherein at least 80% of water used in the method is supplied together with the cellulose raw material.

9. The method according to claim 1 , the method further comprising:
heating the mixture of the cellulose fibers, the alkalization agent, and the anionic agent at a temperature between 50 and 200° C. in order to perform a reaction between the cellulose fibers and the anionic agent.

10. A system for manufacturing cellulose material, the system comprising
means for introducing cellulose fibers to the system,
a sieve plate press,
means for dosing at least two chemicals to the system before the sieve plate press and/or in the sieve plate press, one of the chemicals being an alkalizing agent and the other being monochloracetic acid or a salt thereof,
a feeding device for feeding the cellulose fibers to the sieve plate press, and
means for performing a reaction between the cellulose fibers and the chemical or the chemicals at a consistency of at least 50% in order to produce water-insoluble carboxymethylated cellulose fibers having a degree of substitution between 0.05 and 0.35 carboxymethyl groups per anhydroglucose unit.

11. A system according to the claim 10 , the system further comprising a refiner in order to refine the water-insoluble carboxymethylated cellulose fibers into fibril cellulose.

12. A fibril cellulose material produced from the carboxymethylated cellulose fibers manufactured according to claim 1 , the fibril cellulose material having:
a degree of substitution between 0.05 and 0.35 carboxymethyl groups per anhydroglucose unit,
a turbidity below 200 NTU, as measured at 0.1% concentration in water,
a zero shear viscosity of 5000 to 100 000 Pa s measured at a 0.5% concentration in water, preferably at least 15000 Pa s, and
a yield stress of 4-80 Pa, as measured at a 0.5% concentration in water.

13. The fibril cellulose according to claim 12 , wherein the fibril cellulose has a yield stress equal to or higher than 20 Pa, as measured at a 1.0% concentration in water.

14. The method according to claim 2 , wherein the alkalizing agent is sodium hydroxide and the anionic agent is sodium monochloroacetate.

15. The method according to claim 2 , wherein the amount of the alkalizing agent is between 1 and 20 w-% from dry weight of the used cellulose raw material.

16. The method according to claim 2 , wherein the amount of the anionic agent is between 1 and 30 w-% from dry weight of the used cellulose raw material.

17. The method according to claim 1 , wherein the amount of the alkalizing agent is between 1 and 10 w-% from dry weight of the used cellulose raw material.

18. The method according to claim 1 , wherein the amount of the anionic agent is between 2 and 15 w-% from dry weight of the used cellulose raw material.

19. The fibril cellulose material according to claim 12 , the fibril cellulose material having:
a turbidity between 25 to 100 NTU as measured at 0.1% concentration in water
a zero shear viscosity of at least 15000 Pa s measured at a 0.5% concentration in water
a yield stress of 10-40 Pa as measured at a 0.5% concentration in water.

20. The fibril cellulose material according to claim 19 , the fibril cellulose material having:
a zero shear viscosity of at least 20000 Pa s measured at a 0.5% concentration in water.

Assignees

• Upm Kymmene Corp

Inventors

• Sivonen Eino
• Valta Kyösti
• Nuopponen Markus

Classifications

• C08B11/12

  substituted with carboxylic radicals {, e.g. carboxymethylcellulose [CMC]} · CPC title

• C08B17/06 Primary

  for making cellulose ethers · CPC title

• C08B1/06 Primary

  Rendering cellulose suitable for etherification {(etherification per se C08B11/00)} · CPC title

• D21C3/04 Primary

  with acids, acid salts or acid anhydrides {(D21C3/003 and D21C3/222 take precedence)} · CPC title

• C08B3/06

  Cellulose acetate {, e.g. mono-acetate, di-acetate or tri-acetate} · CPC title