... purging with a carrier gas (as when used in dehydration), or heating under high vacuum.3A (pore size 3 Å): Adsorbs ... , clays, porous glasses, micro porous charcoals, zeolites, active carbons, or synthetic compounds that have open structures through which small molecules, such ... mercaptans to C4H9SH. 5A molecular sievewill not absorb iso-ompounds or rings greater than C4. 13X (pore size 10 Å): Aborbs ...