Oil Rectifier in Marine Refrigeration System
Some refrigerants are miscible with the compressor lubricating oil which means
that the two substances form a mutual solution. Because oil carry over does
occur, the miscibility is actually beneficial because the oil tends to be taken
around the refrigeration circuit and back to the compressor, by the refrigerant.
If the oil and refrigerant are not miscible, as is the case with oil and CO2, then
there may be a loss of lubricant from the compressor sump and accumulation in
the system.
Fig : Oil rectifier