Accession Number : AD0625430

Title :   ON THE PROBLEM OF SEPARATING HYDROAZEOTROPES,

Corporate Author : DIRECTORATE OF SCIENTIFIC INFORMATION SERVICES OTTAWA (ONTARIO)

Personal Author(s) : Dobroserdov,L. L.

Report Date : SEP 1965

Pagination or Media Count : 32

Abstract : Principal theoretical concepts of the action of salts: The possible cause of the more intensive enrichment of the vapor phase by one of the components under the influence of salts is explained. It seems that, in the first approximation, the action of salts in a complex solvent may be set forth as follows. In the dissolving of a salt there takes place a disruption of the crystal lattice and the salt ions formed are distributed throughout the mass of the liquid phase (the solvent). The interaction between the solvent and the dissolved salt may shift away from simple solvation, that is, from a dipole interaction, until complexes of different stability are formed, including hydrogen and other bonds. The change in the activities of the liquid components in the presence of salts, evidently takes place through the unequal attractions exerted by the salt ions on two solvent molecules of different character. There takes place an accumulation of alcohol molecules outside the influence of the salt ion, increasing the tendency of the less polar solvent to volatilize from the solution and pass into the vapor phase. The alcohol vapor pressure over the solution is increased as compared with the system without salt. The activity of the alcohol in the solution is increased. The vapor phase becomes poorer in the second component; its vapor pressure is reduced. To sum up: under the influence of a salt there takes place a change, favoring separation, in the ratio of partial pressures of the components.

Descriptors :   (*ETHANOLS, PHASE STUDIES), (*WATER, PHASE STUDIES), (*CALCIUM COMPOUNDS, PHASE STUDIES), CHLORIDES, THEORY, SEPARATION, LIQUIDS, VAPORS, SOLVENTS, SOLVATES, VAPOR PRESSURE, CANADA, USSR

Subject Categories : Physical Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE