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Ethanol production from biological wastes

Published online: Dec 11, 2009

Geographical region	USA
Subject	Ethanol Production
Issue date	Nov 24, 2009
Title	Ethanol production from biological wastes
Patent Number	US7622285 B2
Patent Application Number	US2008026443 A1
Inventor	Offerman John D; Hogen Delman R; Lighthart Jeffrey W; McTavish Hugh, USA
Relevance	Method and apparatus for producing ethanol, from biological wastes and other organic materials.
Type of claims	Grant
Overview	This patent discloses a method for producing ethanol from biological and organic waste such as manure, sewage, and crop wastes. Advantageously the heat generated in the alcohol-producing catalytic step is used to heat the fermentation mixture. The method includes, A) fermenting organic waste material in a fermentation mixture containing methanogenic microorganisms to a biogas comprising methane and removing sulfhydryls from the biogas, B) converting a portion of the biogas to synthesis gas comprising CO and H2; and contacting a portion of the synthesis gas with a sulfur-free catalyst to produce alcohol, and C) purifying the alcohol, wherein the purified alcohol comprises less than 10 ppm sulfur atoms, less than 5% methanol, and 70% C2+ alcohols by weight.
Related patent documents	US Patent publications US2003211585 - Methods for increasing the production of ethanol from microbial fermentation (2003) US7309592 - Ethanol production from biological wastes (2007) US7169821 - System and method for extracting energy from agricultural waste (2007) US6824682 - System and method for extracting energy from agricultural waste (2007) US5543049 - Microbial mediated water treatment (1996) US5620893 - Microbial mediated method for soil and water treatment (1997) US5667673 - Microbial mediated water treatment (1997) US5821111 - Bioconversion of waste biomass to useful products (1998) US6136577 - Biological production of ethanol from waste gases with Clostridium ljungdahlii (2000) US6248796 - Method for production of mixed alcohols from synthesis gas (2001) US6340581 - Biological production of products from waste gases (2002) US6509180 - Process for producing ethanol (2003) US5185079 - Anaerobic sequencing batch reactor (1993) Foreign patent publications EP0253540 - Synthesis gas conversion process (1998) EP0235886 - Catalyst and its use (1998)
Patent Document	Full Patent Document [external link]

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