Importance

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Abstract

Solid sorbents (acceptors) for noxious components, e.g. SO.sub.x, NO.sub.x and HX, from gases below about 250.degree., specifically acceptors that contain hydrated divalent metal oxide coated onto an exfoliated or expanded mineral support, are improved by heating them before use at a temperature of 450.degree.-650.degree. for a conditioning period of at least a few minutes. So conditioned pulverulent MgO coated onto water-laden exfoliated vermiculite (alternatively expanded perlite) is preferred because of capacity and the ability of the magnesia-based acceptors to be regenerated at a moderately elevated temperature that precludes substantial deterioration of acceptor or equipment. To insure immediate activity the conditioned acceptor is moistened for use. Advantageously the gas and/or the acceptor is humidified during their contact.

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First Claim