ISOBARIC VAPOR-LIQUID-EQUILIBRIA OF ACETONE-PROPYL ETHER AND ISOPROPYL ETHER-PROPYL ETHER SYSTEMS - CORROBORATION OF NO REVERSE VOLATILITY

Isobaric vapor - liquid equilibria were determined at 101.325 kPa for binary mixtures containing acetone + isopropyl ether, acetone + propyl ether and isopropyl ether + propyl ether using a dynamic still with v apor and liquid circulation. The azeotrope of the system acetone + iso propyl ether is in agreement with the literature value and none of the other systems shows an azeotrope. The thermodynamic consistency of th e experimental data was checked by Van Ness's test and Herington's cri terion modified by Wisniak and they satisfied our data. The activity c oefficients were correlated using the Wilson model and the UNIFAC pred iction. In the final part of the work, an experiment for extractive di stillation is described on a laboratory scale and the results confirme d that there is no reversal of volatility of this system.