Process for producing fuel grade ethanol by continuous fermentation, solvent extraction and alcohol separation
Patent 4517298 Issued on May 14, 1985. Estimated Expiration Date: 
September 21, 2003. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
September 21, 2003. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesProduction of ethanol from cellulose using a thermophilic mixed culture Process for the acid hydrolysis of carbohydrate polymers and the continuous fermentation of the sugars _obtained therefrom to provide ethanol Direct process for the production of gasohol from fermentation mixtures Alcohol and fuel production Patent #: 4306884 InventorAssigneeApplicationNo. 06/534262 filed on 09/21/1983US Classes:435/160, Butanol435/161, Ethanol435/162, Multiple stages of fermentation; multiple types of micro-organisms or reuse of micro-organisms435/165, Substrate contains cellulosic material435/813, CONTINUOUS FERMENTATION44/453, Dehydration processes, and products thereof568/920Alkali or alkaline earth metal containing compound utilizedExaminersPrimary: Yoncoskie, Robert A.Attorney, Agent or FirmInternational ClassesC12P 7/02 (20060101)C12P 7/06 (20060101) AbstractAlcohol 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.Field of SearchSubstrate contains sulphite waste liquor or citrus wasteSubstrate contains cellulosic material Produced as by-product, or from waste, or from cellulosic material substrate Ethanol Multiple stages of fermentation; multiple types of micro-organisms or reuse of micro-organisms CONTINUOUS FERMENTATION |
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