Patent ID: 8828692
Filing Date: 2014-09-09
Classification: C12M,C12P,Y02E

Abstract:
1. A process for converting a feed gas containing at least one of CO or a mixture of CO 2 and H 2 under anaerobic conditions to a liquid product comprising at least one of ethanol, propanol, n-butanol, acetic acid, propionic acid and butyric acid: a) passing a feed gas comprising a mixture of at least one of CO or a mixture of CO b) circulating a fermentation liquid on the biofilm support side of the bio-support membrane, the fermentation liquid having a redox potential of less than −200 mV; c) maintaining a biofilm consisting essentially of anaerobic microorganisms on the biofilm support side of the bio-support membrane to convert at least a portion of the feed gas components to a liquid product comprising at least one of ethanol, propanol, n-butanol, acetic acid, propionic acid and butyric acid; d) maintaining a pressure differential across the bio-support membrane that avoids the formation of bubbles in the fermentation liquid and prevents wetting of the bio-support membrane on the gas contacting side of the bio-support membrane; and, e) recovering a liquid product from the fermentation liquid.