Method for producing xylan-containing material

Patent metadata

Field	Value
Publication number	US-10316108-B2
Application number	US-201615543623-A
Country	US
Kind code	B2
Filing date	Jan 22, 2016
Priority date	Jan 26, 2015
Publication date	Jun 11, 2019
Grant date	Jun 11, 2019

Abstract

An object of present invention is to provide a method for easily extracting and efficiently recovering xylan from wood. A xylan-containing material is produced by a method comprising steps of: (a) adding an acid and/or carbon dioxide to a black liquor discharged during a soda cooking step of wood chips including hardwood chips to adjust the pH of the black liquor to be in the range of 1 to 9, thereby giving a suspension; (b) dehydrating and washing an insoluble matter generated in the suspension to separately collect the insoluble matter; and (c) adding an organic solvent to the insoluble matter obtained at the step (b) to give a suspension, and separately collecting a xylan-containing material made of the insoluble matter present in the suspension by solid/liquid separation.

First claim

The invention claimed is:

1. A method for producing a xylan-containing material, comprising the steps of:
(a) adding an acid and/or carbon dioxide to a black liquor discharged during a soda cooking step of wood chips including hardwood chips to adjust the pH of the black liquor to be in the range of 1 to 9, thereby giving a suspension;
(b) dehydrating and washing an insoluble matter generated in the suspension to separately collect the insoluble matter; and
(c) adding an organic solvent to the insoluble matter obtained at the step (b) to give a suspension, and separately collecting a xylan-containing material made of the insoluble matter present in the suspension by solid/liquid separation, wherein the organic solvent is used in an amount two or more times of the weight of the insoluble matter.

2. The method according to claim 1 , wherein at the step (a), carbon dioxide is added to the black liquor to adjust the pH to be in the range of 7 to 9.

3. The method according to claim 2 , wherein the step (b) comprises the steps of:
(1) dehydrating and washing an insoluble matter generated in the suspension obtained at the step (a) to separately collect the insoluble matter;
(2) adding an acid to the collected insoluble matter to give a suspension having the pH in the range of 1 to 9;
(3) dehydrating and washing an insoluble matter generated in the suspension obtained at the step (2) to separately collect the insoluble matter; and
(4) adding an organic solvent to the insoluble matter collected at the step (3) to give a suspension, and separately collecting the insoluble matter present in the suspension by solid/liquid separation.

4. The method according to claim 3 , wherein during the soda cooking step of wood chips, a quinone compound in an amount of from 0.01 to 5% by weight based on the weight of wood chips is added.

5. The method according to claim 4 , wherein the wood chips comprise 50 wt. % or more of hardwood chips.

6. The method according to claim 2 , wherein during the soda cooking step of wood chips, a quinone compound in an amount of from 0.01 to 5% by weight based on the weight of dry wood chips is added.

7. The method according to claim 2 , wherein the wood chips comprise 50 wt. % or more of hardwood chips.

8. The method according to claim 1 , wherein the step (b) comprises the steps of:
(1) dehydrating and washing an insoluble matter generated in the suspension obtained at the step (a) to separately collect the insoluble matter;
(2) adding an acid to the collected insoluble matter to give a suspension having the pH in the range of 1 to 9;
(3) dehydrating and washing an insoluble matter generated in the suspension obtained at the step (2) to separately collect the insoluble matter; and
(4) adding an organic solvent to the insoluble matter collected at the step (3) to give a suspension, and separately collecting the insoluble matter present in the suspension by solid/liquid separation.

9. The method according to claim 8 , wherein during the soda cooking step of wood chips, a quinone compound in an amount of from 0.01 to 5% by weight based on the weight of dry wood chips is added.

10. The method according to claim 8 , wherein the wood chips comprise 50 wt. % or more of hardwood chips.

11. The method according to claim 1 , wherein during the soda cooking step of wood chips, a quinone compound in an amount of from 0.01 to 5% by weight based on the weight of dry wood chips is added.

12. The method according to claim 11 , wherein the wood chips comprise 50 wt. % or more of hardwood chips.

13. The method according to claim 1 , wherein the wood chips comprise 50 wt. % or more of hardwood chips.

14. The method according to claim 1 , wherein the organic solvent comprises acetone.

Assignees

• Jujo Paper Co Ltd

Inventors

• Tsuji Shiho
• Watanabe Masayuki
• Nuruki Yutaka
• Miyawaki Shoichi

Classifications

• C08B37/0057 Primary

  beta-D-Xylans, i.e. xylosaccharide, e.g. arabinoxylan, arabinofuronan, pentosans; (beta-1,3)(beta-1,4)-D-Xylans, e.g. rhodymenans; Hemicellulose; Derivatives thereof · CPC title

• C08B37/14

  Hemicellulose; Derivatives thereof (not used) · CPC title

• D21C11/04

  of alkali lye · CPC title

• D21C3/02

  with inorganic bases or alkaline reacting compounds, e.g. sulfate processes · CPC title

• C08B37/0003 Primary

  General processes for their isolation or fractionation, e.g. purification or extraction from biomass · CPC title