Patent ID: 8039239

Claim:
A method for producing an aliphatic C 2 , C 4 , or C 6 alcohol comprising: (a) providing an acetogenic Clostridium micro-organism having a genetic modification within at least one transcriptional unit, wherein the genetic modification substantially increases the expression of an NADPH-dependent secondary alcohol dehydrogenase gene as compared to the acetogenic Clostridium micro-organism without the genetic modification; (b) supplying a syngas; (c) culturing the acetogenic Clostridium micro-organism in a growth medium in the presence of the syngas; (d) producing the aliphatic C 2 , C 4 , or C 6 alcohol by culturing the Clostridium micro-organism; and (e) recovering the aliphatic C 2 , C 4 , or C 6 alcohol produced in the culture.