Accession Number : AD0708439

Title :   MEASUREMENT OF HEATS OF ADSORPTION OF INSOLUBLE VAPORS ON WATER SURFACES BY GAS CHROMATOGRAPHY.

Descriptive Note : Technical rept.,

Corporate Author : NORTHEASTERN UNIV BOSTON MASS DEPT OF CHEMISTRY

Personal Author(s) : Karger ,Barry L. ; Sewell,Peter A. ; Castells,Reynaldo C. ; Hartkopf,Arleigh

Report Date : 01 JUL 1970

Pagination or Media Count : 35

Abstract : The use of gas chromatography for the study of the adsorption of insoluble vapors on water surfaces is described. The method involves using water coated on a porous support as packing material and presaturation of the carrier gas with water to prevent bleeding from the column. For saturated hydrocarbons it is found that the mechanism of retention is adsorption at the gas-liquid interface, while for aromatic hydrocarbons a mixed mechanism of adsorption and solution occurs. Contrary to recent literature results, the differential heats of adsorption for the insoluble vapors are found to be 1 to 1.5 kcal/mole smaller than the heats of liquefaction. Possible causes for the discrepancy are examined in detail. The question of bulk water in the pores is explored via the partition coefficients of aromatic hydrocarbons. (Author)

Descriptors :   (*WATER, ADSORPTION), (*HYDROCARBONS, *ADSORPTION), GAS CHROMATOGRAPHY, VAPORS, AROMATIC COMPOUNDS

Subject Categories : Physical Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE