EXPERIMENTAL AND PREDICTED EXCESS-ENTHALPIES OF THE WORKING PAIRS (METHANOL OR TRIFLUOROETHANOL PLUS POLYGLYCOL-ETHERS) FOR ABSORPTION CYCLES

In this work we report the excess molar enthalpies at 298.15 K and atm ospheric pressure of the mixtures 2,2,2-trifluoroethanol (TFE) + poly( ethylene glycol) dimethyl ether 250 (PEGDME 250), methanol + tetraethy lene glycol dimethyl ether (TEGDME) and methanol + PEGDME 250. In the case of mixtures with methanol, the UNIFAC and DISQUAC group contribut ion models have been used to compare the predicted and experimental re sults. We have used three versions of the UNIFAC model due to Tassios et al., Larsen et al. and Gmehling et al., for which three group assig nments were made. The best predictions were found with the Gmehling ve rsion of the UNIFAC model. (C) 1997 Elsevier Science B.V.