Patent ID: 8551746
Filing Date: 2013-10-08
Classification: C12P,Y02E

Abstract:
1. A method of restricting the production of butyrate and butanol in an anaerobic fermentation of a gas substrate comprising at least one of CO and a mixture of CO 2 with hydrogen, the method comprising: passing the gas stream to an anaerobic fermentation zone containing at least one species of anaerobic microorganism capable of producing a liquid product comprising light oxygenates; converting at least a portion of the gas stream to the liquid product by contact of the microorganism in the fermentation zone with the gas stream; adding at least one of a 4,4,4, tri-halogen substituted 3(methyltri-halogen substituted) crotonate ester and a 4,4,4, tri-substituted halogen 3(methyltri-halogen substituted) crotonic acid to the fermentation liquid in an amount effective to restrict production of butyrate and butanol; withdrawing fermentation liquid containing the liquid product from the fermentation zone; and, recovering the liquid product from the fermentation liquid.