VOLUMETRIC PROPERTIES OF BINARY-MIXTURES OF WATER WITH ETHANOLAMINE ALKYL DERIVATIVES

Accurate densities for binary mixtures of water + N,N-dimethylethanola mine, and + N,N-diethylethanolamine were measured at different tempera tures. The molar excess volumes V-E of the mixtures and the apparent m olar volumes of both components have been derived as functions of the composition. The V-E values are negative over the entire composition r ange at various temperatures. Compared with monoethanolamine itself, t he introduction of two methyl or ethyl groups into it leads to more ne gative V-E values. The results are discussed in terms of specific inte ractions present in the binary mixtures and a comparative study is mad e between the methyl and ethyl ethanolamine derivatives.