Catalyst – solid sorbent – or support therefor: product or process – Zeolite or clay – including gallium analogs – And additional al or si containing component
Patent
1997-06-20
2000-02-01
Dunn, Thomas
Catalyst, solid sorbent, or support therefor: product or process
Zeolite or clay, including gallium analogs
And additional al or si containing component
502 60, 502 63, 502 64, 502 85, B01J 2906
Patent
active
060202815
ABSTRACT:
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--with at least 60 per cent of the sodium cations replaced with potassium ions, agglomerated with a clay binder and pore-reduced to essentially exclude the adsorption of R-32, and having essentially no reactivity with difluoromethane--has been found to be an effective desiccant for refrigerants comprising difluoromethane.
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Blackwell, Scott and Cohen, Alan P., "Inorganic Fluoride Uptake as a Measure of Relative Compatibility of Molecular Sieve Desiccants with Fluorocarbon Refrigerants" published in American Heating, Refrigeration, and Air Conditioning Engineers, vol. 101, pp. 1-7, and presented on Jun. 26, 1995 at the Annual ASHRAE Conference in San Diego, CA.
Cohen Alan P.
Hurst Jack E.
Lavin MaryEllen
Dunn Thomas
McBride Thomas K.
Silverman Richard P.
Tolomei John G.
UOP LLC
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