Vapor–liquid equilibria for 1,1,2,2-tetrafluoroethyl, 2,2,2-trifluoroethyl ether with several organic compounds containing oxygen

Isobaric vapor–liquid equilibria for 1,1,2,2-tetrafluoroethyl, 2,2,2-trifluoroethyl ether (CHF2CF2OCH2CF3)+alcohols, ketones, or esters systems were measured at 101.3 kPa. The alcohols used were ethanol and 1-propanol. The ketone and ester components were 2-butanone and ethyl acetate, respectively. The measurements were made in an equilibrium still with circulation of both the vapor and liquid phase. The two binary isobaric systems composing of CHF2CF2OCH2CF3 and the alcohols exhibit minimum boiling azeotropes. The azeotropic points are found at x1(az)=0.800 mole fraction and T(az)=326.67 K for CHF2CF2OCH2CF3 (1)+ethanol (2) and x1(az)=0.965 mole fraction and T(az)=329.23 K for CHF2CF2OCH2CF3 (1)+1-propanol (2), respectively. The two binary systems of CHF2CF2OCH2CF3 (1)+2-butanone (2) and CHF2CF2OCH2CF3 (1)+ethyl acetate (2) are both non-azeotropic. The experimental data for the binary systems investigated were correlated with activity coefficient equations. The nonrandom two-liquid (NRTL) equation yielded a good correlation of activity coefficients for the two systems of CHF2CF2OCH2CF3 with alcohols. The CHF2CF2OCH2CF3 (1)+2-butanone (2) system is best correlated with the van Laar equation and CHF2CF2OCH2CF3 (1)+ethyl acetate (2) system best with the three-suffix Margules equation. The thermodynamic consistency of data was good according to the Van Ness and the Herington test.