JOURNAL OF CHEMICAL ENGINEERING OF JAPAN
Print ISSN : 0021-9592
HIGH-PRESSURE TERNARY LIQUID-LIQUID EQUILIBRIA FOR THE SYSTEMS OF WATER, ALCOHOL (1-PROPANOL, 1-BUTANOL AND 1-PENTANOL) AND 1, 1-DIFLUOROETHANE AT 323.2 K
TAKASHI NAKAYAMAHIROSHI SAGARAKUNIO ARAISHOZABURO SAITO
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1988 Volume 21 Issue 2 Pages 129-134

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Abstract

For the separation of fusel oil from low-concentration fermentation broths, ternary liquid-liquid equilibria at 323.2 K were measured for the systems of water and 1, 1-difluoroethane with alcohols (l-propanol, 1-butanol and 1-pentanol). The liquefied gas 1, 1-difluoroethane can achieve much higher distribution coefficients of l-propanol, 1-butanol and 1-pentanol than ethanol. Therefore, 1-propanol, 1-butanol and 1-pentanol will be selectively removed from low-concentration ethanol aqueous solutions with liquefied 1, 1-difluoroethane at low solvent ratios.
The liquid-liquid equilibrium data were correlated by the UNIQUAC and NRTL equations. The UNIQUAC equation gave better correlation of the experimental data than did the NRTL equation. However, the two-phase regions estimated by the UNIQUAC equation were larger than the experimental results for the systems of water + 1-propanol + 1, 1-difluoroethane and water + 1-pentanol + 1, 1-difluoroethane.

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