2ND VIRIAL-COEFFICIENTS OF NORMAL-ALKANES, LINEAR 1-ALKANOLS (AND WATER), ALKYL ETHERS, AND THEIR MIXTURES

Earlier recommendations [J.H. Dymond et al., Fluid Phase Equilibria 27 (1986) 1-13; C. Tsonopoulos et al., Pure Appl. Chem. 61 (1989) 1387-1 394.] are updated for C-4-C-8 alkanes and C-1-C-4 alkanols, and more r ecent values are presented for 1-hexanol. New recommendations are made for butane, on the basis of recent isochoric Burnett measurements. Pr eliminary recommendations are given for dimethyl, diethyl, and diisopr opyl ethers, but nothing definitive can be said about other alkyl ethe rs due to the limited quantity and quality of the available data. Calc ulations with a correlation [C. Tsonopoulos, AIChE J. 20 (1974) 263-27 2] reexamine the dependence of the parameter b of alkanols and paramet er a of alkyl ethers on their reduced dipole moment. Also included is the recent [C. Tsonopoulos and J.L. Heidman, Fluid Phase Equilibria 57 (1990) 261-276] analysis of the data for water and water/alkane binar ies, along with new analyses of data for the binaries of water with me thanol and ethanol. Only other relevant binary data that could be loca ted were for n-hexane/ethanol and methanol/diethyl ether. Recommendati ons are given for the characteristic binary constant k(ij) for all bin aries of interest. In addition, recent results are provided for the cr itical properties of the industrially important alkyl ethers MTBE, ETB E, TAME, and TAEE, together with recommendations for calculating their B with the 1974 correlation. (C) 1997 Elsevier Science B.V.