The present invention relates to compositions for use in refrigeration and
air-conditioning systems comprising
1-ethoxy-1,1,2,2,3,3,4,4,4-nonafluorobutane and at least one
chlorocarbon, alcohol, ketone, ether, ester,
N-(difluoromethyl)-N,N-dimethylamine, or mixtures thereof. Further, the
present invention relates to compositions for use in refrigeration and
air-conditioning systems employing a centrifugal compressor comprising
1-ethoxy-1,1,2,2,3,3,4,4,4-nonafluorobutane and at least one
chlorocarbon, alcohol, ketone, ether, ester,
N-(difluoromethyl)-N,N-dimethylamine, or mixtures thereof. The
compositions of the present invention may be azeotropic or
near-azeotropic and are useful in processes for producing cooling or heat
or as heat transfer fluids.