| abstract |
A method for the preparation of chemical entities of C4 chosen from the group consisting of butyric acid, butanol and derivatives thereof, in which the derivative is 2-butanol, 1,4-butanediol, 2,3-butanediol, aminobutane , thiobutanol, isobutenol or isobutanol, comprising the steps of a) contacting an acetogenic bacterial cell in an aqueous medium with a synthesis gas under anaerobic conditions, b) incubating the mixture obtained in step a) at a temperature between 0 and 100 ° C for at least 30 minutes, wherein the aqueous medium comprises, in step b), ethanol and / or acetate in a total combined concentration of at least 0.1 g l-1, wherein the ethanol and / or acetate is / are an ethanol and / or an acetate that has been exogenously produced. |