| abstract |
The present invention relates to a method for production of organic acid and/or alcohol comprising the steps of:a) providing a basic, aqueous medium containing carbon dioxide in the form of hydrogencarbonate-anions and/or carbonate-anions;b) feeding the basic, aqueous medium containing the carbon dioxide of step (a) into a bipolar membrane electrodialysis unit comprisingan anode,a cathode,an ion-selective anion-exchange membrane, andtwo water-dissociating bipolar membranes,capable of providing for an acidic compartment between the water-dissociating bipolar membrane on the anode side and the ion-selective anion-exchange membrane and for a basic compartment between the water-dissociating bipolar membrane on the cathode side and the ion-selective anion-exchange membrane;c) transporting the carbon dioxide in the form of hydrogencarbonate-anions and/or carbonate-anions across the anion-exchange membrane from the basic compartment into the acidic compartment comprising an acidic, aqueous solution;d) contacting the carbon dioxide in the acidic, aqueous solution from step (c)and hydrogen with at least one acetogenic cell in an aqueous production medium under suitable conditions to produce at least one organic acid and/or alcohol from the carbon dioxide in the acidic, aqueous solution; and optionallye) recovering the organic acid and/or alcohol. |