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Hydration of inorganic solid powder in the presence and absence of polar and nonpolar oil
Author(s) -
Nag Ahindra
Publication year - 1992
Publication title -
journal of the american oil chemists' society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.512
H-Index - 117
eISSN - 1558-9331
pISSN - 0003-021X
DOI - 10.1007/bf02636345
Subject(s) - adsorption , chemistry , enthalpy , polar , sulfate , barium chloride , vapor pressure , inorganic chemistry , barium , water vapor , vapour pressure of water , sodium sulfate , barium sulfate , sodium , organic chemistry , thermodynamics , physics , astronomy
The hydration of powdered barium sulfate in the presence and absence of oils has been thoroughly investigated by the isopiestic vapor pressure technique. The water vapor adsorption isotherms studied at three different temperatures are in good agreement with the type II BET isotherm. Values of n 1 and Δn 1 ° at a given value of p/p o in the presence of polar and nonpolar oils are always higher than the corresponding values in the absence of oil. The adsorption of water vapor depends on the nature and amount of oil present. Temperature has a significant effect on the adsorption process in the presence of oil. The magnitude of the integral enthalpy change (ΔH int o ) is much larger than that observed for barium sulfate in the absence of oil. The absolute binding of water (Δn 1 ) and solute (Δn 2 ) in the presence of sodium chloride are much higher than those for barium sulfate in the absence of oil.