| 摘要 |
The present invention relates to a process for the production of ethanol and butanol from biomass, and in particular to a process for the production of ethanol and butanol using two separate fermentation steps, said process comprising:
a) passing a biomass feedstock without pasteurisation or sterilisation to a first fermentation step,
b) in said first fermentation step subjecting the biomass feedstock to anaerobic fermentation using a mixture of bacterial strains maintained at conditions to convert the biomass to a product predominantly comprising acetic acid and butyric acid,
c) treating the product stream of step (b) to separate a solution comprising the acetic acid and butyric acid by:
(i) separating a solution comprising the acetic acid and butyric acid from any residual solids and
(ii) separating bacteria and/or pasteurising or sterilising the solution from the first fermentation step,
and
d) in a second fermentation step fermenting the solution comprising the acetic acid and butyric acid from step (c) using a solventogenic bacteria to form ethanol and butanol.
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