Title:
Process For Producing Fuel Grade Ethanol By Continuous Fermentation, Solvent Extraction And Alcohol Separation
Process For Producing Fuel Grade Ethanol By Continuous Fermentation, Solvent Extraction And Alcohol Separation
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Abstract
Alcohol substantially free of water is prepared by continuously fermenting a fermentable biomass feedstock in a fermentation unit, thereby forming an aqueous fermentation liquor containing alcohol and microorganisms. Continuously extracting a portion of alcohol from said fermentation liquor with an organic solvent system containing an extractant for said alcohol, thereby forming an alcohol-organic solvent extract phase and an aqueous raffinate. Said alcohol is separated from said alcohol-organic solvent phase. A raffinate comprising microorganisms and unextracted alcohol is returned to the fermentation unit.
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5/14/1985
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Patent