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Maryellen Lavin

Alan P Cohen

Jack E Hurst

Thomas R Cannan

Richard J Hinchey

Nanette Greenlay

Difluoromethane (R-32) is of current interest as a partial replacement for chlorodifluoromethane (R-22) refrigerant heretofore widely used in vapor compression refrigeration systems. R-32 has, however, proved to be more reactive than is desirable with the zeolite A adsorbent-desiccant compositions used in such systems to prevent corrosion and freeze-up problems. The potassium cation form of a zeolite A molecular sieve&mdash;with at least 60 percent of the sodium cations replaced with potassium ions, agglomerated with a clay binder, and pore-reduced to essentially exclude the adsorption of R-32 having essentially no reactivity with difluoromethane, and having a surface ratio of silicon to aluminum of less than about 1.7 mol/mol as determined by X-ray photoelectron spectroscopy&mdash;has been found to be an effective desiccant for refrigerants comprising difluoromethane.

Desiccant for drying CH2F2 refrigerant utilizing zeolite

Process for drying CH2F2 refrigerant utilizing zeolite

Difluoromethane (R32) is of current interest as a partial replacement for chlorodifluoromethane (R22) refrigerant heretofore widely used in vapor compression refrigeration systems. R32 has, however, proved to be more reactive than is desirable with the zeolite A adsorbent-desiccant compositions used in such systems to prevent corrosion and freeze-up problems. The sodium cation form of a zeolite having the crystal structure of zeolite B is found to be an effective adsorbent for that purpose and to be significantly less reactive with the R32.

Process for drying CH.sub.2 F.sub.2 refrigerant utilizing zeolite

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Hightstown, NJ, United States of America

Maryellen Lavin