Method for preparing fructose or xylulose from biomass containing glucose or xylose using butanol, and method for separating the same

Patent metadata

Field	Value
Publication number	US-10227668-B2
Application number	US-201715635060-A
Country	US
Kind code	B2
Filing date	Jun 27, 2017
Priority date	Jul 1, 2016
Publication date	Mar 12, 2019
Grant date	Mar 12, 2019

Abstract

The present invention relates to a method for preparing fructose or xylulose from biomass comprising glucose or xylose, and a method for separating a mixture of glucose and fructose and a mixture of xylose and xylulose.

First claim

The invention claimed is:

1. A method for preparing fructose or xylulose from biomass containing glucose or xylose, comprising:
a first step of reacting the biomass containing glucose or xylose in the presence of a solid base or solid acid catalyst at 80° C. to 150° C. using butanol as a solvent, to isomerize glucose or xylose; and
a second step of cooling the reaction solution obtained from the first step to 40° C. to 60° C. to crystallize unreacted glucose or xylose and then filtering the resultant to remove the unreacted glucose or xylose.

2. The method of claim 1 , which further comprises a third step of cooling the reaction solution obtained from the second step to 10° C. to 30° C. to crystallize fructose or xylulose and then filtering to recover the fructose or xylulose.

3. The method of claim 1 , wherein the solid base catalyst is a hydrotalcite containing magnesium.

4. The method of claim 3 , wherein the solid base catalyst comprises magnesium in a molar ratio of 0.5 to 3.5:1 relative to the amount of aluminum contained in the solid base catalyst.

5. The method of claim 1 , wherein the solid acid catalyst is a zeolite containing aluminum.

6. The method of claim 5 , wherein the solid acid catalyst comprises silicon in a molar ratio of 5 to 50:1 relative to the amount of aluminum contained in the solid acid catalyst.

7. The method of claim 1 , wherein the biomass comprising glucose or xylose is used in an amount of 1 wt % to 30 wt % relative to the amount of the butanol solvent.

8. The method of claim 1 , wherein the solid base or solid acid catalyst is used in an amount of 10 wt % to 100 wt % relative to the amount of the biomass containing glucose or xylose.

9. The method of claim 1 , wherein the butanol is 1-butanol, 2-butanol, or isobutanol.

10. A method for preparing 5-hydroxymethylfurfural or furfural from the biomass containing glucose or xylose, comprising:
a first step of reacting the biomass containing glucose or xylose in the presence of a solid base or solid acid catalyst at 80° C. to 150° C. using butanol as a solvent, to prepare fructose or xylulose by isomerizing glucose or xylose;
a second step of cooling the reaction solution obtained from the first step to 40° C. to 60° C. to crystallize unreacted glucose or xylose and then filtering the resultant to remove the unreacted glucose or xylose; and
a third step of adding a solid acid catalyst to the reaction solution obtained from the second step and dehydrating fructose or xylulose, to prepare 5-hydroxymethylfurfural or furfural.

11. The method of claim 10 , wherein the third step is carried out at 50° C. to 110° C. at 0.1 atm to 1 atm.

12. A method for separating a mixture of glucose and fructose, comprising:
a first step of preparing a solution comprising a mixture of glucose and fructose in butanol; and
a second step of adjusting the temperature of the solution to 40° C. to 60° C. to specifically dissolve fructose, and separating glucose from the solution by filtration.

13. The method of claim 12 , which further comprises a third step of cooling and filtering the solution obtained from the second step to 10° C. to 30° C. to crystallize fructose.

14. A method for separating a mixture of xylose and xylulose, comprising:
a first step of preparing a solution comprising a mixture of xylose and xylulose in butanol; and
a second step of adjusting the temperature of the solution to 40° C. to 60° C. to specifically dissolve xylulose, and separating xylose from the solution by filtration.

15. The method of claim 14 , wherein the method further comprises a third step of cooling and filtering the solution obtained from the second step to 10° C. to 30° C. to crystallize xylulose.

16. The method of claim 12 , wherein the butanol is 1-butanol, 2-butanol, or isobutanol.

17. The method of claim 14 , wherein the butanol is 1-butanol, 2-butanol, or isobutanol.

Assignees

• Korea Res Inst Chemical Tech

Inventors

• Hwang Dong Won
• Upare Pravin Pandharinath
• Hwang Young Kyu
• Hwang In Taek
• Chang Jong San
• Hong Do Young
• Lee U Hwang

Classifications

• C13K13/00

  Sugars not otherwise provided for in this class · CPC title

• B01J37/0236

  Drying, e.g. preparing a suspension, adding a soluble salt and drying · CPC title

• C07H3/02

  Monosaccharides · CPC title

• B01J37/04

  Mixing {(B01J37/0009, B01J37/0018 take precedence)} · CPC title

• C07D307/50

  Preparation from natural products · CPC title