Method for Increasing the Concentration of Xylose in Lignocellulosic Hydrolysate

• US 20110155336A1
• Filed: 12/31/2009
• Published: 06/30/2011
• Est. Priority Date: 12/31/2009
• Status: Active Grant

• Current Assignee: Atomic Energy Council-Institute Of Nuclear Research
• Original Assignee: ATOMIC ENERGY COUNCIL-INSTITUTE OF NUCLEAR ENERGY RESEARCH
• Inventors: Chen, Wen-Hua, Wang, Jia-Baau, Men, Lee-Chung, Hwang, Wen-Song, Chen, Sheng-Shieh
• Granted Patent: US 8,080,128 B2
• Time in Patent Office: Days
• US Class Current: 162/70
• CPC Class Codes: C08H 8/00 Macromolecular compounds derived from lignocellulosic materials pretreatment thereof B27N
• CPC Class Codes: D21C 1/04 with acid reacting compounds
• CPC Class Codes: D21C 3/04 with acids, acid salts or acid anhydrides D21C3/003 and D21C3/222 take precedence
• CPC Class Codes: D21C 9/005 organic compounds

Abstract

Disclosed is a method for increasing the concentration of xylose in lignocellulosic hydrolysate. The method includes the step of extruding lignocellulosic material and mixing the lignocellulosic material with diluted acid and the step of conducting hot-water extraction on the mixture. Hence, the concentration of the xylose in the lignocellulosic hydrolysate can achieve a high concentration of 60 g/L, and the yield of the xylose can reach to 90%.

Claims

1. A method for increasing the concentration of xylose in lignocellulosic hydrolysate comprising the steps of:

extruding lignocellulosic material and mixing the lignocellulosic material with diluted acid; and

conducting hot-water extraction on the mixture so that the concentration of the xylose in the lignocellulosic hydrolysate is 40 to 60 g/L and that the yield of the xylose is 70% to 90%.

2. The method according to claim 1, wherein the lignocellulosic material is selected from a group consisting of rice straw, bagasse, silvergrass, napiergrass, switchgrass, corn stover, wood, bamboo and algae.

3. The method according to claim 1 comprising the step of using a twin-screw extruder to extrude the lignocellulosic material and mix the lignocellulosic material with the diluted acid.

4. The method according to claim 3, wherein step of extruding lignocellulosic material and mixing the lignocellulosic material with the diluted acid comprises the steps of:

controlling the feed rate of the lignocellulosic material and the flow rate of the diluted acid to control the ratio of the lignocellulosic material to the diluted acid;

controlling the concentration of the diluted acid, the rotational speeds of screws of the twin-screw extruder and the temperature; and

controlling the time for the step of extrusing and mixing according to an intended amount of the lignocellulosic hydrolysate.

5. The method according to claim 4, wherein the feed rate of the lignocellulosic material is 6 to 7 kg/h.

6. The method according to claim 4, wherein the flow rate of the diluted acid is 12 to 14 kg/h.

7. The method according to claim 4, wherein the concentration of the diluted acid is 1% to 3%.

8. The method according to claim 4, wherein the rotational speed of the screw is 30 to 150 rpm.

9. The method according to claim 4, wherein the temperature is 80°

C. to 160°

C.

10. The method according to claim 3, wherein the step of hot-water extraction lasts for 10 to 30 minutes, and the temperature therein is 130°

C. to 145°

C.