Cellulose solution manufacturing method, cellulose precipitate manufacturing method, cellulose saccharification method, cellulose solution, and cellulose precipitate

• US 9,522,991 B2
• Filed: 09/22/2011
• Issued: 12/20/2016
• Est. Priority Date: 09/24/2010
• Status: Expired due to Fees

• Current Assignee: Ehime Prefectural Government, Sekisui Chemical Company Limited (Sekisui)
• Original Assignee: Ehime Prefectural Government, Sekisui Chemical Company Limited (Sekisui)
• Inventors: Nakamura, Kenji, Higaki, Seiji, Yatsuzuka, Manami, Doyama, Kazuo, Iwane, Kazuyoshi, Takao, Masaki
• Primary Examiner(s): HOLLAND, PAUL J
• Application Number:
  US13/703,125
• Publication Number:
  US 20130177948A1
• Time in Patent Office: 1,916 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: 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
• CPC Class Codes: C08H 8/00 Macromolecular compounds derived from lignocellulosic materials pretreatment thereof B27N
• CPC Class Codes: C08L 1/02 Cellulose; Modified cellulose
• CPC Class Codes: C12P 19/02 Monosaccharides 2-ketogulonic acid C12P7/60
• CPC Class Codes: C12P 19/14 produced by the action of a carbohydrase (EC 3.2.x), e.g. by alpha-amylase , e.g. by cellulase, hemicellulase
• CPC Class Codes: C12P 2201/00 Pretreatment of cellulosic or lignocellulosic material for subsequent enzymatic treatment or hydrolysis
• CPC Class Codes: C12P 2203/00 Fermentation products obtained from optionally pretreated or hydrolyzed cellulosic or lignocellulosic material as the carbon source
• CPC Class Codes: C13K 1/02 obtained by saccharification of cellulosic materials manufacture of fodder A23K10/32
• CPC Class Codes: D21C 1/08 with oxygen-generating compounds
• CPC Class Codes: D21C 3/02 with inorganic bases or alkaline reacting compounds, e.g. sulfate processes
• CPC Class Codes: D21C 3/028 in presence of O3
• CPC Class Codes: D21C 5/02 Working-up waste paper mechanical part D21B1/08, D21B1/32
• CPC Class Codes: Y02W 30/64 Paper recycling

Abstract

The invention relates to a cellulose solution manufacturing method including: performing an ozonation treatment to bring a cellulose-containing material and ozone into contact with each other; and performing an alkali treatment to bring the obtained treated material and an alkali aqueous solution into contact with each other, thereby dissolving at least cellulose in the cellulose-containing material brought into contact with the ozone in the alkali aqueous solution. According to the invention, it is possible to provide a method of manufacturing a cellulose solution in which cellulose can be dissolved in a more simple manner, a method of manufacturing a cellulose precipitate in which cellulose can be recovered from the cellulose solution, and a method of saccharifying cellulose which uses the cellulose precipitate.

Claims

1. A cellulose solution manufacturing method comprising:

providing a cellulose-containing material, wherein said cellulose-containing material comprises at least one of cotton, lyocell, rayon, and cupra;

contacting said cellulose-containing material with ozone to obtain an ozonated cellulose-containing material;

drying said ozonated cellulose-containing material at a temperature in the range of 50°

C. to 160°

C. to obtain a dried treated material;

mixing said dried treated material with a 1N to 5N sodium hydroxide aqueous solution to obtain a mixture; and

maintaining said mixture at a temperature of −

10°

C. to 50°

C. for 0.1 minute to 60 minutes to dissolve at least cellulose and obtain a cellulose solution comprising dissolved cellulose having a polymerization degree of 50 to 50,000.

2. The method of claim 1, wherein said ozone is present at a concentration of 1 mg/L to 300 mg/L, and a time of contacting said cellulose-containing material with said ozone is 1 minute to 300 minutes.

3. The method of claim 1, further comprising:

adjusting a pH of said cellulose solution to pH 7 or less to precipitate and obtain a cellulose precipitate.

4. The method of claim 1, further comprising:

extruding said cellulose solution into an acid aqueous solution to obtain a cellulose precipitate.

6. The method of claim 3, further comprising:

saccharifying said cellulose precipitate in the presence of a cellulolytic enzyme to thereby obtain an aqueous solution containing water-soluble oligosaccharides or glucose.

7. The method of claim 1, wherein said dissolved cellulose in said cellulose solution is capable of forming a cellulose precipitate having a cellulose content of 50 wt % to 100 wt %.

8. The method of claim 1, wherein said temperature of said mixture is maintained at −

5°

C. to 30°

C. for 1 minute to 30 minutes.

5. The method of 4, wherein said acid aqueous solution has a pH from 1.0 to 6.9 and a concentration of acid from 1 wt % to 50 wt %.

9. A cellulose solution manufacturing method comprising:

providing a cellulose-containing material, wherein said cellulose-containing material comprises at least one of cotton, lyocell, rayon, and cupra;

contacting said cellulose-containing material with ozone to obtain an ozonated cellulose-containing material;

drying said ozonated cellulose-containing material at a temperature in the range of 50°

C. to 160°

C. to obtain a dried treated material;

mixing said dried treated material with an aqueous solution consisting of 1N to 5N sodium hydroxide and water to obtain a mixture; and

maintaining said mixture at a temperature of −

10°

C. to 50°

C. for 0.1 minute to 60 minutes to dissolve at least cellulose and obtain a cellulose solution comprising dissolved cellulose having a polymerization degree of 50 to 50,000.