Excess enthalpies of (carbon dioxide + cyclohexane)(g) and of (carbon dioxide + benzene)(g) at the pressure 101.3 kPa over the temperature range 354 K to 399 K

Benzene–polar fluid association. An analysis of measurements of the vapour phase excess molar enthalpy of mixtures of (cyclohexane, or benzene + polar and non-polar fluids)

“…Finally, values of B 12 for benzene-polar fluid can be calculated either from the pair potential parameters given in table 1 with the interaction parameters (1 − k 12 ) from table 2 and the association parameters from table 4, or from the parameters of the square well equations given in table 3, or from the Tsonopoulos correlation together with equations (12) to (14) and (20) to (25).…”

“…The H E m measurements on (carbon dioxide + cyclohexane) and (carbon dioxide + benzene) (43) were made at low pressures over the temperature range (354.2 to 398.6) K, and using a high pressure mixing apparatus (44) at temperatures up to 573.2 K. The aim of the work was to investigate the strength of quadrupole-quadrupole forces between the unlike molecules, and for this purpose an expression in terms of Buckingham H functions due to Kielich (45) was used. Contributions to the second virial coefficient arising from TABLE 4.…”

“…Equations (20) to (25) provide a convenient way for calculating the specific contribution to B 12 from equations (12) to (14). The non-specific contribution can be calculated from a corresponding states correlation such as that of Tsonopoulos.…”

“…A single stage high pressure flow mixing calorimeter (12) was also used, and in this instrument the Joule-Thomson effect was negligible. The measurements were made on (cyclohexane, or benzene + nitrogen, (13) or methane, (10) or carbon dioxide, (14) or dimethyl ketone, (15) or diethyl ketone, (16) or ether, (17) or dioxane, (18) or chloromethane, (19) or dichloromethane, (20) or chloroform, (21) or tetrachloromethane, (20) or water, (22) or methanol, (23) or ethanol (24) ). For some of these fluids the available pure component second virial coefficients were either of poor quality, or in the case of dioxane non-existent.…”

Quadrupole coupling in (carbon dioxide+dioxane)(g). The excess molar enthalpy and second virial cross-coefficient of (dioxane+carbon dioxide or propane)(g)

“…In a recent series of papers, we reported vapour phase measurements of the excess molar enthalpy H E m of mixtures of benzene, or cyclohexane with the polar fluids carbon dioxide, (1) dioxane, (2) ether, (3) dimethyl ketone, (4) diethyl ketone, (5) chloromethane, (6) dichloromethane, (7) chloroform, (8) water, (9) methanol, (10) and ethanol. (11) The measurements were made at standard atmospheric pressure using either a single-stage flow-mixing calorimeter, (12) or a differential flow-mixing calorimeter.…”