Processes for Producing A Fermentation Product Using A Fermenting Organism
AssigneeNovozymes A/S
InventorsJennifer Headman, Eric Allain, Jeremy Saunders
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Abstract
The present invention relates to processes for producing a fermentation product, such as ethanol, from starch-containing material; wherein an acid having a pKa in the range from 3.75 to 5.75 is present or added in fermentation so that the acid concentration in fermentation is maintained between above 0 (zero) and 100 mmoles/L fermentation medium and wherein the acid is added before the exponential growth phase of the fermenting organism.
Claims20
A process for producing a fermentation product from starch-containing material comprising the steps of:
- i) liquefying the starch-containing material at a temperature above the initial gelatinization temperature using an alpha-amylase;
- ii) saccharifying using a glucoamylase;
- and
- iii) fermenting using a fermenting organism;
- wherein an acid having a pKa in the range from 3.75 to 5.75 is present and/or added in fermentation so that the acid concentration in fermentation is maintained between above 0 (zero) and 100 mmoles/L fermentation medium and wherein the acid is added before the exponential growth phase of the fermenting organism.
A process for producing a fermentation product from starch-containing material comprising the steps of:
- (i) saccharifying the starch-containing material at a temperature below the initial gelatinization temperature;
- and
- (ii) fermenting using a fermenting organism;
- wherein saccharification and/or fermentation is done in the presence of the following enzymes:
- glucoamylase and alpha-amylase, and optionally protease;
- and wherein an acid having a pKa in the range from 3.75 to 5.75 is present and/or added in fermentation so that the acid concentration in fermentation is maintained between above 0 (zero) and 100 mmoles/L fermentation medium and wherein the acid is added before the exponential growth phase of the fermenting organism.
Dependencies are inferred from the claim text.