Vapour pressures and critical points of liquids. Fused ring compounds.
Abstract:(Scanned original: to be superseded.)
ESDU 93028 presents vapour pressure data for 36 hydrocarbons and Carbazole. The data were obtained by a critical evaluation of experimental results in the literature. Where the data were less extensive or reliable, it was found possible to develop a correlation using a method that relates the second differential of the Wagner vapour pressure equation to the difference between the ideal gas and the liquid heat capacities. The Wagner equation was used over a temperature range usually from close to the melting point to the critical point, although for some compounds the correlation was stopped at about 0.8 of the critical temperature. The coefficients of the equation are given for each compound and two tables of vapour pressure values calculated using them are included: in SI units at 5 K intervals and in mm of mercury or atmospheres (for the higher values) at 5 degree Celsius intervals. A table also gives the saturation temperature at various specified pressures and indicates the possible uncertainty in the calculated values. An Antoine equation is given fitting the Wagner equation values between 2 and 200 kPa with an rms deviation of between 0.05 and 0.1 per cent. The sources of data for each compound are also listed. Density data for the majority of the compounds are given in ESDU 93029.
|Data Item ESDU 93028|