Self-sufficient process for the production of biomass hydrolysate with reduced salt content

Patent metadata

Field	Value
Publication number	US-10519477-B2
Application number	US-201615758727-A
Country	US
Kind code	B2
Filing date	Aug 19, 2016
Priority date	Sep 11, 2015
Publication date	Dec 31, 2019
Grant date	Dec 31, 2019

Abstract

The present invention is directed to a self-sufficient process for the production of biomass hydrolysate with reduced salt content as well as the de-salted hydrolysate produced after the inventive process and the use of the de-salted hydrolysate as a fermentation medium.

First claim

The invention claimed is:

1. Process for the production of de-salted biomass hydrolysate comprising the steps
a) Providing a biomass;
b) Acidic pretreatment of the biomass;
c) Hydrolysis of the biomass to obtain a biomass hydrolysate;
d) Solid-liquid separation of the biomass hydrolysate to obtain a solid phase and a liquid phase;
e) Deionization of the liquid phase by electrodialysis using at least one bipolar membrane;
f) Separation of an acid and/or an alkaline fraction from the deionized liquid phase;
g) Addition of at least part of the separated acid fraction to step b)
wherein steps a) to g) are repeated at least once.

2. Process according to claim 1 , wherein the pretreatment is carried out by steam explosion.

3. Process according to claim 1 , wherein all of the separated acid fraction is added to step b).

4. Process according to claim 1 , wherein the hydrolysis of the biomass is carried out by enzymatic hydrolysis.

5. Process according to claim 4 , wherein at least part of the separated alkaline fraction is added to step c).

6. Process according to claim 5 , wherein the at least part of the separated alkaline fraction is added to step c) until the biomass has a pH in the range of from 4.5 to 5.5.

7. Process according to claim 1 , wherein the temperature of the biomass hydrolysate is set to a temperature selected from the range of from 50 to 95° C.

8. Process according to claim 1 , wherein at least part of the separated acid fraction is added to the biomass hydrolysate until the pH of the separated liquid phase is set to a pH selected from the range of from pH 1.5 to 4.5.

9. Process according to claim 1 , wherein the biomass is lignocellulose biomass.

10. Process according to claim 1 , wherein the electrodialysis using at least one bipolar membrane is followed by membrane capacitive deionization or ion exchange chromatography.

Assignees

• Clariant Int Ltd

Inventors

• Zavrel Michael
• Dennewald Danielle
• Hoffmann Philip
• Verhuelsdonk Marcus

Classifications

• C12P2203/00

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

• C12P19/20 Primary

  produced by the action of an exo-1,4 alpha-glucosidase, e.g. dextrose · CPC title

• D21C1/04

  with acid reacting compounds · CPC title

• C12P19/02

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

• C12P2201/00

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