Abstract
Increasing concern over the possible depletion of stratospheric ozone by all chlorine-containing refrigerants is driving the fluorochemical industry to identify replacements for HCFCs such as R22 (CHClF 2). As a pure fluid this is currently used as the major refrigerant in air conditioning systems and in an azeotrope with R115 (CF 3CF 2Cl) for supermarket refrigeration. This paper describes candidates for fluorocarbon replacements for R22 and R502 and indicates how the selection can be made to ensure low environmental impact yet satisfying the equipment manufacturers' requirements for nonflammability and good performance. These factors will be related to molecular structure.
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