Method for pretreating wood dust and method for manufacturing bioalcohol

Patent metadata

Field	Value
Publication number	US-2017356015-A1
Application number	US-201615372412-A
Country	US
Kind code	A1
Filing date	Dec 8, 2016
Priority date	Jun 13, 2016
Publication date	Dec 14, 2017
Grant date	—

Abstract

A method for pretreating a wood dust includes conducting a structurally damaged step and an alkali treatment step. In the structurally damaged step, the wood dust is disposed in a scCO 2 atmosphere with a pressure of 2600 psi to 3400 psi at a temperature of 40° C. to 120° C. for a predetermined time, and then the pressure is adjusted to drop to an atmospheric pressure in a sudden manner to obtain a structurally damaged wood dust. In the alkali treatment step, the structurally damaged wood dust is immersed in an alkaline H 2 O 2 solution at a temperature of 50° C. to 70° C., a concentration of H 2 O 2 in the alkaline hydrogen peroxide solution is in a range of 0.1 wt % to 2.1 wt %, and a pH value of the alkaline H 2 O 2 solution is in a range of 10.5 to 12. Thus a treated wood dust is obtained.

First claim

What is claimed is:

1 . A method for pretreating a wood dust, comprising:
conducting a structurally damaged step, wherein the wood dust is disposed in a supercritical carbon dioxide atmosphere with a pressure of 2600 psi to 3400 psi at a temperature of 40° C. to 120° C. for a predetermined time, and then the pressure is adjusted to drop to an atmospheric pressure in a sudden manner to obtain a structurally damaged wood dust; and conducting an alkali treatment step, wherein the structurally damaged wood dust is immersed in an alkaline hydrogen peroxide solution at a temperature of 50° C. to 70° C., a concentration of hydrogen peroxide in the alkaline hydrogen peroxide solution is in a range of 0.1 wt % to 2.1 wt %, and a pH value of the alkaline hydrogen peroxide solution is in a range of 10.5 to 12, thus a treated wood dust is obtained.

2 . The method for pretreating the wood dust of claim 1 , further comprising:
conducting a heating step before conducting the alkali treatment step, wherein the structurally damaged wood dust is heated with a temperature of 80° C. to 120° C.

3 . The method for pretreating the wood dust of claim 2 , wherein the heating step is conducted for 15 minutes to 30 minutes.

4 . The method for pretreating the wood dust of claim 1 , wherein the predetermined time in the structurally damaged step is 7.5 minutes to 37.5 minutes.

5 . The method for pretreating the wood dust of claim 1 , wherein the alkali treatment step is conducted at most 9 hours.

6 . A method for manufacturing a bioalcohol, comprising:
conducting a pretreatment step, comprising:
conducting a structurally damaged step, wherein a wood dust is disposed in a supercritical carbon dioxide atmosphere with a pressure of 2600 psi to 3400 psi at a temperature of 40° C. to 120° C. for a predetermined time, and then the pressure is adjusted to drop to an atmospheric pressure in a sudden manner to obtain a structurally damaged wood dust; and
conducting an alkali treatment step, wherein the structurally damaged wood dust is immersed in an alkaline hydrogen peroxide solution at a temperature of 50° C. to 70° C., a concentration of hydrogen peroxide in the alkaline hydrogen peroxide solution is in a range of 0.1 wt % to 2.1 wt %, and a pH value of the alkaline hydrogen peroxide solution is in a range of 10.5 to 12, thus a treated wood dust is obtained;
conducting a hydrolysis step, wherein a polysaccharide of the treated wood dust is hydrolyzed into monosaccharides; and conducting a fermentation step, wherein the monosaccharides are converted into an alcohol.

7 . The method for manufacturing the bioalcohol of claim 6 , wherein the pretreatment step further comprises:
conducting a heating step before conducting the alkali treatment step, wherein the structurally damaged wood dust is heated with a temperature of 80° C. to 120° C.

8 . The method for manufacturing the bioalcohol of claim 7 , wherein the heating step is conducted for 15 minutes to 30 minutes.

9 . The method for manufacturing the bioalcohol of claim 6 , wherein the predetermined time in the structurally damaged step is 7.5 minutes to 37.5 minutes.

10 . The method for manufacturing the bioalcohol of claim 6 , wherein the alkali treatment step is conducted at most 9 hours.

Assignees

• Univ Nat Tsing Hua
• Chang Chun Plastics Co Ltd
• Chang Chun Petrochemical Co Ltd

Inventors

• Tan Chung-Sung
• Phan The Duy

Classifications

• C12P2203/00

  Fermentation products obtained from optionally pretreated or hydrolyzed cellulosic or lignocellulosic material as the carbon source · CPC title

• C12P7/20 Primary

  Glycerol · CPC title

• C12P7/10 Primary

  substrate containing cellulosic material · CPC title

• C12P7/16

  Butanols · CPC title

• C12P2201/00

  Pretreatment of cellulosic or lignocellulosic material for subsequent enzymatic treatment or hydrolysis · CPC title