Acetic acid consuming strain
AssigneeDsm IP Assets B.V.
InventorHans Marinus Charles Johannes De Bruijn
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Abstract
The invention describes a process for the production of ethanol from a composition comprising glucose and between 50 μM and 100 mM acetic acid, said process comprising fermenting said composition in the presence of a recombinant yeast which is capable to convert acetic acid anaerobically; maintaining the amount of undissociated acetic acid at a value of at least 50 μM; and recovering the ethanol. Said process is useful for both starch and cellulosic based, acetic acid containing hydrolysates and advantageously results in a greater consumption of acetic acid and thus higher ethanol yields.
Claims12
A process for production of ethanol from a composition comprising glucose and between 50 μM and 100 mM acetic acid, said process comprising:
- fermenting said composition until the amount of undissociated acetic acid is 1 mM or less in the presence of a recombinant yeast which comprises an exogenous glycerol transporter and is capable of converting acetic acid anaerobically;
- monitoring the amount of undissociated acetic acid in the composition during the fermentation;
- adding acid to the composition to maintain the amount of undissociated acetic acid at a value ≥50 μM and ≤1 mM for the remainder of the fermentation;
- and
- recovering the ethanol.
Dependencies are inferred from the claim text.