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Recovery of Ethanol from Aqueous Solution by Extraction and Gas Stripping process

The objective of this study was to compare the ethanol separation from aqueous solutions by extraction and gas stripping process. Liquid–liquid extraction (LLE) of ethanol was performed using 1-octanol as the extractant. The distribution coefficient of ethanol in water /1-octanol system was determined (KDE = 0, 6). Equilibrium distribution coefficients for ternary system (ethanol + 1-octanol + water) were determined at 25 °C under atmospheric pressure and related separation factor for extractive ethanol removal from ethanol-water mixture have been calculated (α = 6). Ethanol elimination from aqueous solutions by gas stripping (GS) in the stripping column was investigated. A stream of air, nitrogen and carbon dioxide was sparged through a stripping column with the porous sintered glass (porosity 1) as gas sparger in order to remove the ethanol from the same aqueous solution as by LLE. Mass transfer coefficients of ethanol for this system were determined. LLE and GS were integrated in biotechnological process of bioethanol production. Mathematical model of simultaneous extraction-fermentation-product-recovery system (SEFPR) for ethanol production from sugar beet cossettes was used for the mathematical description of integrated bioprocess and for the calculation of its benefits (in order to compare new process toward classical ethanol production).

Bioethanol; Sugar beet cossettes; Liquid-liquid extraction; Gas stripping; 1-octanol; Mathematical modelling; Integrated bioprocess system

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