In relation to the concentration of ethanol solution from fermentation using near- or super-critical CO2 extraction, vapor-liquid equilibria for the CO2-Ethanol-Water system were measured at 9.6, 17.2, 19.6, 25.0 and 32.0 °C up to 9 MPa in the wide range of ethanol concentration, including very dilute region (0.1-5wt%), where no data have been reported. A flow type apparatus equipped with a back pressure regulator was adopted for measurements in order to maintain the feed composition. From our experimental results, we concluded that, 1. 1) There are certain T and P conditions which give a maximum separation factor. 2. 2) In the low concentration region of ethanol, the distribution coefficient of ethanol is about 213 of the value in the higher ethanol concentration region. The measured data were compared with the results predicted by Patel-Teja equation and Group-Contribution equations of state (GC-EOS).
ASJC Scopus subject areas
- Chemical Engineering(all)
- Physics and Astronomy(all)
- Physical and Theoretical Chemistry