Method for the production of a fermentation product from a pretreated lignocellulosic feedstock
First Claim
1. A method for obtaining a fermentation product from a sugar hydrolysate obtained from a feedstock comprising hemicellulose, comprising:
- (i) removing suspended fiber solids from the sugar hydrolysate to obtain a clarified sugar solution;
(ii) fermenting xylose in the clarified sugar solution in a fermentation reaction with yeast to produce a fermentation broth comprising a fermentation product;
(iii) separating the yeast from the fermentation broth to produce a yeast slurry and a fermentation product,(iv) treating the yeast slurry with an oxidant to reduce microbial contaminants in the yeast slurry, thereby producing oxidant-treated yeast slurry;
(v) re-introducing at least a portion of the oxidant-treated yeast slurry back to the step of fermenting, step (ii), to increase the concentration of yeast in the fermentation reaction; and
(vi) recovering the fermentation product.
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Abstract
A method for obtaining a fermentation product from a sugar hydrolysate obtained from a feedstock containing hemicellulose, by (i) removing suspended fiber solids from said sugar hydrolysate to obtain a clarified sugar solution; (ii) fermenting xylose in the clarified sugar solution in a fermentation reaction with yeast to produce a fermentation broth comprising the fermentation product; (iii) separating the yeast from the fermentation broth to produce a yeast slurry; (vi) treating the yeast slurry thus obtained with an oxidant to kill microbial contaminants, thereby an oxidant-treated yeast slurry; (v) re-introducing at least a portion of the oxidant-treated yeast back to step (ii) to increase the concentration of yeast in said fermentation reaction; and (vi) recovering the fermentation product.
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Citations
26 Claims
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1. A method for obtaining a fermentation product from a sugar hydrolysate obtained from a feedstock comprising hemicellulose, comprising:
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(i) removing suspended fiber solids from the sugar hydrolysate to obtain a clarified sugar solution; (ii) fermenting xylose in the clarified sugar solution in a fermentation reaction with yeast to produce a fermentation broth comprising a fermentation product; (iii) separating the yeast from the fermentation broth to produce a yeast slurry and a fermentation product, (iv) treating the yeast slurry with an oxidant to reduce microbial contaminants in the yeast slurry, thereby producing oxidant-treated yeast slurry; (v) re-introducing at least a portion of the oxidant-treated yeast slurry back to the step of fermenting, step (ii), to increase the concentration of yeast in the fermentation reaction; and (vi) recovering the fermentation product. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification