Recovery of inorganic salt during processing of lignocellulosic feedstocks
First Claim
1. A method for recovering inorganic salt during processing of a lignocellulosic feedstock comprising:
- (a) pretreating the lignocellulosic feedstock by adding one or more than one acid to the lignocellulosic feedstock to produce a pretreated lignocellulosic feedstock, wherein at least a portion of hemicellulose in the feedstock is hydrolyzed to produce one or more than one sugar monomer selected from the group consisting of xylose, arabinose, mannose, galactose and a combination thereof;
(b) removing a sugar-acid mixture from the pretreated lignocellulosic feedstock;
(c) adding base to the removed sugar-acid mixture and then recovering inorganic salt therefrom;
(d) adding one or more than one soluble base to the pretreated lignocellulosic feedstock to adjust the pretreated lignocellulosic feedstock to a pH of about 4.0 to about 6.0 to produce a neutralized feedstock;
(e) enzymatically hydrolyzing the neutralized feedstock to produce a sugar stream and an enzyme hydrolyzed feedstock; and
(f) fermenting the sugar stream to produce a fermentation broth comprising alcohol.
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Abstract
A method for recovering inorganic salt during processing of a lignocellulosic feedstock is provided. The method comprises pretreating the lignocellulosic feedstock by adding an acid to the feedstock to produce a pretreated lignocellulosic feedstock. A soluble base is then added to the pretreated lignocellulosic feedstock to adjust the pH and produce a neutralized feedstock. The neutralized feedstock is then enzymatically hydrolyzed to produce an enzyme hydrolyzed feedstock and a sugar stream. Inorganic salt is recovered from either a stream obtained from the lignocellulosic feedstock prior to the step of pretreating, a stream obtained from the pretreated lignocellulosic feedstock, a stream obtained from the neutralized feedstock, a stream obtained from the sugar stream, or a combination of these streams. The inorganic salt may be concentrated, clarified, recovered and purified by crystallization, electrodialysis drying, or agglomeration and granulation, and then used as desired, for example as a fertilizer.
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Citations
29 Claims
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1. A method for recovering inorganic salt during processing of a lignocellulosic feedstock comprising:
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(a) pretreating the lignocellulosic feedstock by adding one or more than one acid to the lignocellulosic feedstock to produce a pretreated lignocellulosic feedstock, wherein at least a portion of hemicellulose in the feedstock is hydrolyzed to produce one or more than one sugar monomer selected from the group consisting of xylose, arabinose, mannose, galactose and a combination thereof; (b) removing a sugar-acid mixture from the pretreated lignocellulosic feedstock; (c) adding base to the removed sugar-acid mixture and then recovering inorganic salt therefrom; (d) adding one or more than one soluble base to the pretreated lignocellulosic feedstock to adjust the pretreated lignocellulosic feedstock to a pH of about 4.0 to about 6.0 to produce a neutralized feedstock; (e) enzymatically hydrolyzing the neutralized feedstock to produce a sugar stream and an enzyme hydrolyzed feedstock; and (f) fermenting the sugar stream to produce a fermentation broth comprising alcohol. - 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, 27, 28, 29)
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Specification