Abstract
The biomass processing is one of the demanded promising technologie including energy carriers and valuable chemical reagents. The developed processes of lignin bio-processing suggest the use of a synthetic biological system that allows obtaining lower aliphatic alcohols through the stage of formation of carboxylic acids. Due to the production of alcohols in the form of dilute aqueous solutions, their recovery and concentration are extremely energy-consuming stages. In this paper, a vapor-phase membrane separation method is considered in application to aqueous solutions containing alcohols and organic acids. The transfer of vapors of water, C1–C4 alcohols and acetic acid through commercial pervaporation and gas separation membranes, which have not been previously studied for this purpose, has been investigated. RomakonTM-102 PM membrane demonstrated the highest separation of water-alcohol mixtures. Based on the experimental data obtained, mathematical modeling of the process of ethanol recovery from triple mixture “water/ethanol/acetic acid” by the vapor-phase membrane method was carried out.
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