Accession Number : AD0754713

Title :   Molecular Sieve Properties of the Carbonaceous Products Prepared by Chemical Dehydrohalogenation of Polyvinylidene Chloride,

Corporate Author : ROYAL MILITARY COLL OF CANADA KINGSTON (ONTARIO) DEPT OF CHEMISTRY AND CHEMICAL ENGINEERING

Personal Author(s) : Barton,Stuart S. ; Beswick,Paul G. ; Harrison,Brian H.

Report Date : 07 MAR 1972

Pagination or Media Count : 9

Abstract : The molecular sieve properties of the carbonaceous products prepared by chemical dehydrohalogenation of polyvinylidene chloride (hereafter referred to as carbons) have been investigated by a heat of immersion study, using the immersional liquid as a molecular probe. Dehydrohalogenation reaction time has been found to play an important role in the carbons' molecular sieve properties. Characterization of the carbons by low temperature nitrogen adsorption was found in some cases to be limited by activated diffusion so the study was supplemented by measuring the adsorption of carbon dioxide at - 78 and 0C. A marked transition was observed in the molecular sieve properties as reaction time during dehydrohalogenation was varied. The carbons prepared using a small reaction time are shown to have 4-5A molecular sieve properties which can separate straight and branched chain hydrocarbons. Carbons prepared by longer reaction periods were found to have a 3 A molecular sieve properties. These carbons have also been contrasted to the properties of carbons prepared by pyrolysing polyvinylidene chloride. (Author)

Descriptors :   (*CARBON, *GAS FILTERS), VINYL PLASTICS, INFRARED SPECTRA, ADSORPTION, NITROGEN, CARBON DIOXIDE, CANADA

Subject Categories : Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE