Process for liquid/solid separation of lignocellulosic biomass hydrolysate fermentation broth
First Claim
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1. A process for separating a liquid fraction from a lignocellulosic biomass hydrolysate fermentation broth comprising:
- a) providing a lignocellulosic biomass hydrolysate fermentation broth comprising a target product;
b) optionally removing the target product from the lignocellulosic biomass hydrolysate fermentation broth of (a), producing a depleted broth;
c) treating the broth of (a) or depleted broth of (b) at a temperature between about 70°
C. and about 150°
C. and for a time of between about 30 seconds and about 210 minutes to produce a broth or depleted broth having at least about 20% reduced filter cake resistance as compared to the respective starting broth of (a) or depleted broth of (b); and
d) passing the treated broth or depleted broth of (c) through a filter, thereby separating a liquid fraction from a solid fraction wherein the liquid fraction comprises less than about 0.1% suspended solids and is concentrated into a syrup having at least 40% solids and a viscosity less than about 100 centipoise.
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Abstract
When lignocellulosic biomass hydrolysate is included in fermentation medium, the broth resulting from biocatalyst production is complex with low filterability. A heat treatment was found to increase filterability, allowing efficient separation of a liquid fraction from a solid fraction, which is further processed for water recycle and syrup production.
36 Citations
13 Claims
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1. A process for separating a liquid fraction from a lignocellulosic biomass hydrolysate fermentation broth comprising:
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a) providing a lignocellulosic biomass hydrolysate fermentation broth comprising a target product; b) optionally removing the target product from the lignocellulosic biomass hydrolysate fermentation broth of (a), producing a depleted broth; c) treating the broth of (a) or depleted broth of (b) at a temperature between about 70°
C. and about 150°
C. and for a time of between about 30 seconds and about 210 minutes to produce a broth or depleted broth having at least about 20% reduced filter cake resistance as compared to the respective starting broth of (a) or depleted broth of (b); andd) passing the treated broth or depleted broth of (c) through a filter, thereby separating a liquid fraction from a solid fraction wherein the liquid fraction comprises less than about 0.1% suspended solids and is concentrated into a syrup having at least 40% solids and a viscosity less than about 100 centipoise. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A process for the production of ethanol comprising:
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a) providing a lignocellulosic biomass hydrolysate fermentation broth comprising an ethanol product; b) treating the fermentation broth of (a) at a temperature between about 70°
C. and about 150°
C. and for a time of between about 30 seconds and about 210 minutes to produce a heated broth having at least about 20% reduced filter cake resistance as compared to the starting broth of (a);c) passing the heated broth of (b) through a filter, thereby separating a liquid fraction from a solid fraction wherein the liquid fraction comprises less than about 0.1% suspended solids and is concentrated into a syrup having at least 40% solids and a viscosity less than about 100 centipoise; and d) distilling the liquid fraction of (c) to produce an ethanol product stream and a remaining liquid.
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13. A process for the production of ethanol comprising:
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a) providing a lignocellulosic biomass hydrolysate fermentation broth comprising an ethanol product; b) distilling the lignocellulosic biomass hydrolysate fermentation broth of (a) to produce an ethanol product stream and a whole stillage; c) treating the whole stillage of (b) at a temperature between about 70°
C. and about 150°
C. and for a time of between about 30 seconds and about 210 minutes to produce a whole stillage having at least about 20% reduced filter cake resistance as compared to the starting whole stillage of (b); andd) passing the whole stillage of (c) through a filter, thereby separating a liquid fraction from a solid fraction wherein the liquid fraction comprises less than about 0.1% suspended solids and is concentrated into a syrup having at least 40% solids and a viscosity less than about 100 centipoise.
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Specification