OPTIMIZED PROCESS FOR PRODUCING ALCOHOLS BY ABE / IBE FERMENTATION COUPLING

摘要

The present invention relates to a process for producing alcohols comprising: a. a step of ABE fermentation using at least one ABE bioreactor containing an ABE microorganism and fed at least by an aqueous solution SABE of C5 and/or C6 sugars, in order to produce a fermentation must ABei; b. optionally a step of intermediate extraction of acetone, to produce at least one acetone stream (A) and an aqueous stream of alcohols; c. a step of IBE fermentation using at least one IBE bioreactor containing an IBE microorganism and fed by an aqueous solution SIBE of C5 and/or C6 sugars and a solvent stream which comprises at least (i) said fermentation must ABei resulting from step a), or (ii) the acetone stream (A) from the optional step b), the flow rates of the aqueous solution SIBE and of the solvent stream being adjusted so that the concentration of acetone in the IBE feed is less than or equal to 10 g/L, in order to produce a fermentation must IBea.