Vapour pressures and critical points of liquids: Glycol ethers (alkyl cellosolves and carbitols etc.)
Abstract:(Scanned original: to be superseded.)
ESDU 95004 presents vapour pressure data for 10 C3 to C8 monoalkyl ethers (6 cellosolves and 4 carbitols) and 6 C4 to C10 dialkyl ethers (2 cellosolves, 2 carbitols, triglyme and tetraglyme). The data were obtained by a critical evaluation of experimental results in the literature. The data available were limited but using a correlation previously developed for the alkanes that relates the second differential of the Wagner vapour pressure equation to the difference between the ideal gas and liquid heat capacities, extrapolation was possible assuming the behaviour of each monoalkyl ether to be like that of the homomorphic alkan-1-ol and the behaviour of each dialkyl ether to be like that of the homomorphic alkane. The Wagner equation was used over a temperature range from close to the melting point to about the critical temperature, although for some compounds it is terminated at around 0.9 critical point. The coefficients of the equation are given and two tables of vapour pressure 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. Also given are values of acentric factor, normal melting point, normal boiling point and the slope of the saturation temperature v vapour pressure curve at the normal boiling point. The sources of data for each compound are listed. Density data for the compounds appear in ESDU 95005, and the choice of critical point values gave the best correlations for both vapour pressure and density.
|Data Item ESDU 95004|