Process for starch liquefaction

Patent metadata

Field	Value
Publication number	US-10174130-B2
Application number	US-201314370329-A
Country	US
Kind code	B2
Filing date	Aug 7, 2013
Priority date	Aug 9, 2012
Publication date	Jan 8, 2019
Grant date	Jan 8, 2019

Abstract

The present invention relates to a process for the liquefaction of starch present in a starch slurry comprising degraded starch and having a DE of from 0.05 to 9. Preferably, the invention relates to a process for the liquefaction of starch present in a starch slurry comprising degraded starch, said starch slurry having a high dry substance. Further preferably, the invention relates to a continuous process for liquefaction of starch present in a starch slurry comprising degraded starch and having a high dry substance.

First claim

The invention claimed is:

1. A process for liquefying starch present in a starch slurry, comprising:
a. Providing in a reactor a first starch slurry comprising degraded starch, wherein the first starch slurry has a dextrose equivalent (DE) of from 0.05 to 9 and a solubilisation level of at least 3; and
b. Adding starch to the reactor containing the first starch slurry at a temperature of from 25 to 75° C., to obtain a second starch slurry having a dry substance of from 40 w/w % to 80 w/w %; and
c. Removing a portion of the second starch slurry from the reactor and sending it towards a liquefaction step and replacing the removed portion with starch, wherein the starch consists of native starch, to maintain the second starch slurry in the reactor at a dry substance of from 40 w/w % to 80 w/w %;
wherein the step c is repeated and performed in a continuous way.

2. The process according to claim 1 , wherein the first starch slurry has a solubilisation level of at least 6.

3. The process according to claim 1 , wherein the first starch slurry has a solubilisation level of at least 10.

4. The process according to claim 1 , wherein the first starch slurry has a solubilisation level of at least 20.

5. The process according to claim 1 , wherein the degraded starch is one or more of the maltodextrins, dextrose, and maltose.

6. The process according to claim 1 , wherein the degraded starch is a pre-liquefact obtained by a pre-liquefaction comprising enzyme treatment, at a temperature between 20 and 75° C.

7. The process according to claim 1 , wherein the starch added in step b and step c has a dry substance of from 40 w/w % to 90w/w %.

8. The process according to claim 1 , wherein one or more starch degrading enzymes are added in step b or step c and wherein the starch added in step b comprises native starch.

9. The process according to claim 1 , wherein the second starch slurry has a pH of from 3.5 to 6.5.

10. The process according to claim 1 , wherein one or more starch degrading enzymes are added in step b and/or step c.

11. The process according to claim 1 , wherein one or more starch degrading enzymes are added in step b or step c and wherein the starch degrading enzymes comprise α-amylase.

12. The process according to claim 1 , wherein one or more starch degrading enzymes are added in step b and/or step c and wherein the second starch slurry has a pH of from 3.5to 6.5.

13. The process according to claim 1 , additionally comprising the step of carrying out a liquefaction step on the removed portion of the second starch slurry by indirect heating and without steam injection.

Assignees

• Cargill Inc

Inventors

• Derez Frank
• De Sadeleer Jos Willy Ghislain Corneel
• Ketsman Joost
• Nataloni Luigi

Classifications

• C08B30/14

  Cold water dispersible or pregelatinised starch · CPC title

• C08B30/18

  Dextrin {, e.g. yellow canari, white dextrin, amylodextrin or maltodextrin; Methods of depolymerisation, e.g. by irradiation or mechanically} · CPC title

• C12P19/22

  produced by the action of a beta-amylase, e.g. maltose · CPC title

• C12P19/02

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

• C08B30/08 Primary

  Concentration of starch suspensions · CPC title