Abstract
Infinite-dilution activity coefficients of water, γ ∞ H 2 O, in triethylene glycol (TEG) polyethylene glycol (PEG) of various molecular weights, glycerol and their mixtures are measured using the gas—liquid partition chromatography method. The data are used to provide a preliminary comparison of the relative merit of these solvents as dehydrating agents at elevated temperatures. The mixed solvents are less volatile than the lower boiling pure solvents and therefore will suffer less loss in the solvent regeneration process. The highest molecular weight PEG was found to have the largest drying capacity on a molar basis, but the lowest capacity on a mass basis. The converse is true for glycerol, the lowest molecular weight dehydrating agent studied. It was found that over the temperature range covered, ln γ ∞ H 2 O is linear in 1/ T. γ ∞ H 2 O for TEG is least sensitive to temperature while γ ∞ H 2 O for the highest molecular weight PEG is the most sensitive. For mixed dehydrating agents, the results are very well correlated by a weight fraction weighted average of the data for the constituent pure solvents with a single small temperature independent empirical constant.
Published Version
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