# US 10,119,173 B2 · Ionic liquid and method for dissolving cellulose using the same

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- Number: US 10,119,173 B2
- Document ID: US10119173B2
- Status: Granted
- Kind: B2
- Application number: 15/671,176
- Filed: 2017-08-08
- Published: 2018-04-19
- Granted: 2018-11-06
- Earliest claimed: 2016-10-18
- Assignees: Panasonic Intellectual Property Management Co., Ltd.
- Applicants: Panasonic Intellectual Property Management Co., Ltd.
- Inventors: Takahiro Aoki; Tomoko Kawashima; Haruka Kusukame; Yuko Taniike
- Web page: https://patentgrep.com/patent/US10119173B2

## CPC

- C13K 1/02: obtained by saccharification of cellulosic materials (manufacture of fodder A23K10/32)
- C07C 215/08: with only one hydroxy group and one amino group bound to the carbon skeleton
- C07C 229/26: having more than one amino group bound to the carbon skeleton, e.g. lysine
- C07C 229/36: with at least one amino group and one carboxyl group bound to the same carbon atom of the carbon skeleton
- C08B 1/00: Preparatory treatment of cellulose for making derivatives thereof {, e.g. pre-treatment, pre-soaking, activation}
- C08B 1/003: {Preparation of cellulose solutions, i.e. dopes, with different possible solvents, e.g. ionic liquids (solutions used in the manufacture of monocomponent artificial filaments or cellulose or derivatives thereof D01F2/02)}
- C08J 3/096: {Nitrogen containing compounds}
- C08K 5/00: Use of organic ingredients
- D21C 3/20: with organic solvents {or in solvent environment}
- 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}
- C08J 2301/02: Cellulose; Modified cellulose
- Y02P 20/54: using solvents, e.g. supercritical solvents or ionic liquids
- C13K: SACCHARIDES OBTAINED FROM NATURAL SOURCES OR BY HYDROLYSIS OF NATURALLY OCCURRING DISACCHARIDES, OLIGOSACCHARIDES OR POLYSACCHARIDES (chemically synthesised sugars or sugar derivatives C07H; polysaccharides, e.g. starch, derivatives thereof C08B; malt C12C; fermentation or enzyme-using processes for preparing compounds containing saccharide radicals C12P19/00; production of sucrose C13B)
- C07C: ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C08B: POLYSACCHARIDES; DERIVATIVES THEREOF (polysaccharides containing less than six saccharide radicals attached to each other by glycosidic linkages C07H; fermentation or enzyme-using processes C12P19/00; sugar industry C13; production of cellulose D21)
- C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29)
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- D21C: PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

The present invention provides an ionic liquid represented by the following chemical formula, [(CH3)3N(CH2)2OH]+[NH2(CH2)3CH(NH2)COO]−. The present invention provides an ionic liquid capable of dissolving cellulose within twenty-four hours.

## Claims

### Claim 1

A method for dissolving cellulose, the method comprising:
(a) adding cellulose to ionic liquid represented by the following chemical formula (I):
[(CH3)3N(CH2)2OH]+[NH2(CH2)3CH(NH2)COO]− (I).

### Claim 2 (depends on 1)

The method according to claim 1, further comprising:
(b1) heating the ionic liquid to which the cellulose has been added to dissolve the cellulose in the ionic liquid after the step (a).

### Claim 3 (depends on 1)

The method according to claim 1, further comprising:
(b2) leaving the ionic liquid to which the cellulose has been added at rest to dissolve the cellulose in the ionic liquid after the step (a).

### Claim 4 (depends on 1)

The method according to claim 1, further comprising:
(b3) stirring the ionic liquid to which the cellulose has been added to dissolve the cellulose in the ionic liquid after the step (a).

### Claim 5 (depends on 1)

The method according to claim 1, wherein cellulose is dissolved in the ionic liquid within twenty-four hours after the step (a).

### Claim 6

A method for dissolving cellulose, the method comprising:
(a) adding cellulose to an ionic liquid composition containing an ionic liquid represented by the following chemical formula (I):
[(CH3)3N(CH2)2OH]+[NH2(CH2)3CH(NH2)COO]− (I).

### Claim 7 (depends on 6)

The method according to claim 6, further comprising:
(b1) heating the ionic liquid composition to which the cellulose has been added to dissolve the cellulose in the ionic liquid after the step (a).

### Claim 8 (depends on 6)

The method according to claim 6, further comprising:
(b2) leaving the ionic liquid composition to which the cellulose has been added at rest to dissolve the cellulose in the ionic liquid after the step (a)′.

### Claim 9 (depends on 6)

The method according to claim 6, further comprising:
(b3) stirring the ionic liquid composition to which the cellulose has been added to dissolve the cellulose in the ionic liquid after the step (a).

### Claim 10 (depends on 6)

The method according to claim 6, wherein the cellulose is dissolved in the ionic liquid composition within twenty-four hours after the step (a).

### Claim 11 (depends on 6)

The method according to claim 6, wherein the ionic liquid composition contains water, and weight ratio of the water to the ionic liquid is not more than 4.3%.

### Claim 12 (depends on 6)

The method according to claim 6, wherein the ionic liquid composition contains an aprotic polar solvent.

### Claim 13 (depends on 12)

The method according to claim 12, wherein the aprotic polar solvent is dimethyl sulfoxide.

### Claim 14 (depends on 13)

The method according to claim 13, wherein weight ratio of the dimethyl sulfoxide to the ionic liquid is not more than 309%.