Process for the production of shaped cellulose articles

Patent metadata

Field	Value
Publication number	US-10240259-B2
Application number	US-201414781928-A
Country	US
Kind code	B2
Filing date	Apr 4, 2014
Priority date	Apr 4, 2013
Publication date	Mar 26, 2019
Grant date	Mar 26, 2019

Abstract

A method of manufacturing a cellulose-based shaped article. The method comprises subjecting a solution of lignocellulosic material, dissolved in a distillable ionic liquid, to a spinning method, wherein the ionic liquid is a diazabicyclononene (DBN)-based ionic liquid. DBN-based ionic liquids have good dissolution power, high thermal and chemical stability, lack runaway reactions and exhibit low energy consumption, due to low spinning temperatures. The shaped cellulose articles can be used as textile fibers, high-end non-woven fibers, technical fibers, films for packaging, and barriers films in batteries, as membranes and as carbon-fiber precursors.

First claim

The invention claimed is:

1. A method of manufacturing of a cellulose-based shaped article by subjecting a solution comprising a lignocellulosic material dissolved in a distillable ionic liquid to a spinning method, wherein the ionic liquid is a diazabicyclononene (DBN) based ionic liquid.

2. The method according to claim 1 , wherein the DBN-based ionic liquid comprises a DBN-based cation and an anion that imparts a high basicity, in terms of the Kamlet-Taft beta (β) parameter, said DBN-based cation having a residue R, which is selected from linear and branched alkyl, typically C 1 -C 6 alkyl, alkoxy, alkoxyalkyl and aryl groups, and hydrogen.

3. The method according to claim 1 , wherein the DBN-based ionic liquid comprises a 1,5-diazabicyclo[4.3.0]non-5-enium cation of the formula (I)

R 1 is selected from the group of hydrogen, linear and branched C 1 -C 6 alkyl, C 1 -C 6 alkoxy, C 1 -C 10 alkoxyalkyl and C 6-18 aryl groups,
an anion selected from halides; pseudohalides; a carboxylate; an alkyl sulphite, an alkyl sulphate, a dialkyl phosphite, a dialkyl phosphate, a dialkyl phosphonites, and a dialkyl phosphonate.

4. The method according to claim 1 , wherein the DBN-based ionic liquid has a 1,5-diazabicyclo[4.3.0]non-5-enium cation of Formula (I) in claim 3 , where R 1 is H, and a carboxylate anion.

5. The method according to claim 1 , wherein the DBN-based ionic liquid is [DBNH][CO 2 Et] or[DBNH][OAc].

6. The method according to claim 1 , wherein the lignocellulosic material is a chemical, mechanical or chemimechanical pulp produced from wood or a non-wood source, or where the lignocellulosic material is a waste material.

7. The method according to claim 1 , wherein the solution additionally comprises a lignin.

8. The method according to claim 1 , wherein the lignin is derived from a lignin-containing pulp.

9. The method according to claim 1 , wherein a solution comprising a lignocellulosic material dissolved in a distillable DBN-based ionic liquid is
extruded through a spinning nozzle,
shaped as filament or film by stretching the film or filament while still in solution to orient the molecules, and
after passing through the air-gap, the fibres or film are drawn through a water-containing spin bath, where the cellulose is regenerated.

10. The method according to claim 1 , where any type of unbleached and bleached chemical pulp is used as raw material.

11. The method according to claim 1 , wherein spinning is carried out by air-gap spinning, wet spinning, or dry-jet wet spinning.

12. The method according to claim 1 , where the spinning solution has a zero shear viscosity between 5,000 and 70,000 Pas at spinning conditions.

13. The method according to claim 1 , where the solvent is purified by vacuum distillation.

14. The method according to claim 1 , wherein the cellulose fibre produced has a dry tenacity of >35 cN/tex and a wet-to-dry tenacity of >0.80.

15. The method according to claim 1 , wherein the polysaccharides present in the lignocellulosic pulp undergo negligible degradation, if any, during the process.

16. The method according to claim 1 , wherein the process causes negligible water pollution due to degradation products.

17. The method according to claim 1 , wherein the fibres produced are suitable for use in woven or non-woven textiles, for technical purposes, or for use as carbon-fibre precursors.

18. The method according to claim 1 , wherein the shaped article is a film or a fibre.

Assignees

• Aalto Univ Foundation
• Helsingin Yliopisto
• Aalto Univ Foundation Sr

Inventors

• Michud Anne
• King Alistair W T
• Parviainen Arno
• Sixta Herbert
• Hauru Lauri
• Hummel Michael
• Kilpeläinen Iikka

Classifications

• D01F9/16

  from products of vegetable origin or derivatives thereof, e.g. from cellulose acetate (D01F9/18 takes precedence) · CPC title

• D10B2201/22

  made from cellulose solutions · CPC title

• C08L97/02

  Lignocellulosic material, e.g. wood, straw or bagasse {(manufacture of articles made from lignocellulosic material by dry processes B27N)} · CPC title

• D01F2/02 Primary

  from solutions of cellulose in acids, bases or salts · CPC title

• C08L97/005

  Lignin · CPC title