Process for enzymatic hydrolysis of lignocellulosic material and fermentation of sugars

Patent metadata

Field	Value
Publication number	US-10131923-B2
Application number	US-201815956841-A
Country	US
Kind code	B2
Filing date	Apr 19, 2018
Priority date	Nov 9, 2012
Publication date	Nov 20, 2018
Grant date	Nov 20, 2018

Abstract

The invention relates to a process for the preparation of a fermentation product from ligno-cellulosic material, comprising the following steps:
a) optionally pre-treatment of the ligno-cellulosic material; b) optionally washing of the optionally pre-treated ligno-cellulosic material; c) enzymatic hydrolysis of the optionally washed and/or optionally pre-treated ligno-cellulosic material using an enzyme composition comprising at least two cellulase and whereby the enzyme composition at least comprises GH61; d) whereby less than 7.5 mg enzyme composition/g glucan (on dry matter and enzyme as protein) or less than 3.0 mg enzyme composition/g feedstock (on dry matter and enzyme as protein) is used; and e) fermentation of the hydrolyzed ligno-cellulosic material to produce a fermentation product; and f) optionally recovery of a fermentation product;

wherein before and/or during the enzymatic hydrolysis oxygen is added to the ligno-cellulosic material.

First claim

The invention claimed is:

1. A process for preparation of a fermentation product from ligno-cellulosic material, comprising:
enzymatic hydrolysis, in a reactor, of ligno-cellulosic material using an enzyme composition comprising at least two cellulases and whereby the enzyme composition at least comprises GH61; whereby between 0.1 and 7.5 mg enzyme composition/g glucan (on dry matter and enzyme as protein) or between 0.05 and 3.0 mg enzyme composition/g feedstock (on dry matter and enzyme as protein) is used; and
fermentation of the hydrolysed ligno-cellulosic material to produce the fermentation product;
wherein the enzymatic hydrolysis occurs for a first part of time and a subsequent second part of time; and
(i) during the first part of time oxygen is added to the ligno-cellulosic material to maintain a concentration of dissolved oxygen in the range of 0.02 mol/m 3 to 0.12 mol/m 3 , during the second part of time the concentration of dissolved oxygen is at a concentration at least 50% less than during the first part of time, and the first part of time is 2% to 80% of the total enzymatic hydrolysis time; or
(ii) during the first part of time dissolved oxygen in the ligno-cellulosic material is at a concentration that is at least 50% less than during the second part of time, during the second part of time oxygen is added to the ligno-cellulosic material to maintain a concentration of dissolved oxygen in the range of 0.02 mol/m 3 to 0.12 mol/m 3 , and the second part of time is 2% to 80% of the total enzymatic hydrolysis time;
and dissolved oxygen is measured under normal atmospheric pressure and at about 62° C.;
the reactor has a volume of 1 m 3 or more; and
the ligno-cellulosic material has a dry matter content of 10 wt % or more.

2. The process according to claim 1 , wherein oxygen is added during the first part of time, and the dissolved oxygen concentration is maintained in the range of 0.02 mol/m 3 to 0.045 mol/m 3 .

3. The process according to claim 1 wherein oxygen is added during the second part of time, and the dissolved oxygen concentration is maintained in the range of 0.02 mol/m 3 to 0.045 mol/m 3 .

4. The process according to claim claim 1 , wherein the enzyme composition used retains activity for 30 hours or more.

5. The process according to claim 1 , wherein the hydrolysis is conducted at a temperature of 50° C. or more.

6. The process according to claim 1 , wherein the enzyme composition is from a fungus or the enzyme composition comprises a fungal enzyme.

7. The process according to claim 1 , wherein the dry matter content is 14 to 33 wt %.

8. A process according to claim 1 in which the enzymatic hydrolysis takes place in a batch, fed batch and/or continuous culture reactor.

9. A process according to claim 1 in which oxygen is introduced as an oxygen-containing gas, in the form of bubbles.

10. The process according to claim 1 , wherein the enzyme composition is from a fungus, and the fungus is a microorganism of the genus Rasamsonia.

11. The process according to claim 1 , wherein the enzyme composition comprises a fungal enzyme, and the fungal enzyme is a Rasamsonia enzyme.

12. The process of claim 1 , further comprising pre-treatment of the ligno-cellulosic material, prior to the enzymatic hydrolysis.

13. The process of claim 1 , further comprising washing of the ligno-cellulosic material, prior to the enzymatic hydrolysis.

14. The process of claim 1 , further comprising recovery of a sugar product from the enzymatic hydrolysis.

15. The process of claim 1 , further comprising, prior to the enzymatic hydrolysis, pre-treatment of the ligno-cellulosic material and washing of the pre-treated ligno-cellulosic material.

16. The process of claim 1 , further comprising pre-treatment of the ligno-cellulosic material prior to the enzymatic hydrolysis and recovery of a sugar product from the enzymatic hydrolysis.

17. The process of claim 1 , further comprising pre-treatment of the ligno-cellulosic material and washing of the pre-treated ligno-cellulosic material, prior to the enzymatic hydrolysis, and recovery of a sugar product from the enzymatic hydrolysis.

18. The process of claim 1 , wherein oxygen is added during the first part of time, and the first part of time is 2% to 30% of the total enzymatic hydrolysis time.

19. The process of claim 1 , wherein oxygen is added during the second part of time, and the second part of time is 12% to 50% of the total enzymatic hydrolysis time.

20. The process of claim 1 , wherein the reactor has a volume of 10 m 3 or more.

21. The process of claim 1 , wherein the reactor has a volume of 50 m 3 or more.

22. The process of claim 1 , wherein oxygen is added during the first part of time, and during the second part of time the concentration of dissolved oxygen is at a concentration at least 70% less than during the first part of time.

23. The process of claim 1 , wherein oxygen is added during the first part of time, and during the second part of time the concentration of dissolved oxygen is at a concentration at least 90% less than during the first part of time.

24. The process of claim 23 , wherein the first part of time is 5% to 20% of the total enzymatic hydrolysis time.

25. The process of claim 1 , wherein oxygen is added during the second part of time, and during the first part of time the concentration of dissolved oxygen is at a concentration at least 70% less than during the second part of time.

26. The process of claim 1 , wherein oxygen is added during the second part of time, and during the first part of time the concentration of dissolved oxygen is at a concentration at least 90% less than during the second part of time.

27. The process of claim 26 , wherein the second part of time is 20% to 40% of the total enzymatic hydrolysis time.

Assignees

• Dsm Ip Assets Bv

Inventors

• Noordam Bertus
• Berkhout Michael Petrus Jozef

Classifications

• C12P7/54

  Acetic acid (vinegar C12J) · CPC title

• C12P19/02

  Monosaccharides (2-ketogulonic acid C12P7/60) · CPC title

• C12P7/48

  Tricarboxylic acids, e.g. citric acid · CPC title

• C12P2203/00

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

• C12P17/10

  Nitrogen as only ring hetero atom · CPC title