EXCESS-ENTHALPIES OF (CARBON DIOXIDE+PENTANE OR HEXANE OR HEPTANE OR CYCLOHEXANE OR BENZENE) (G) AT TEMPERATURES FROM 432.2-K TO 573.2-K AND PRESSURES UP TO 2.71 MPA

A flow mixing calorimeter for the measurement of the excess molar enthalpy HEm of gaseous substances at temperatures up to 580 K and at pressures up to 15 MPa has been constructed. The apparatus has been used to measure HEm(x = 0.5) for {0.5CO2 + 0.5CH3(CH2)v-2CH3} where v = 5, 6, and 7, and for (0.5CO2 + 0.5c-C6H12), and (0.5CO2 + 0.5C6H6). The measurements were in the temperature range 423.2K to 573.2K at pressures up to 2.71 MPa. The measurements at pressures up to 1 MPa were all fitted to within experimental error by the virial equation of state with second virial coefficient terms calculated from the McGlashan and Potter correlation and third virial coefficient terms from the Orbey and Vera correlation. The carbon-dioxide-n-alkane interaction energy was found to be weaker than that of alkane-alkane, but that of carbon-dioxide-benzene was found to be stronger. © 1992 Academic Press Limited All rights reserved.