Final answer:
The synthetic lubricant used with ternary blends containing HCFCs is Polyol Ester, which is preferred because of its compatibility with HCFC refrigerants.
Step-by-step explanation:
The synthetic lubricant presently used with ternary blends containing HCFCs (hydrochlorofluorocarbons) is Polyol Ester. HCFCs are types of refrigerants that have been developed to be less damaging to the ozone layer compared to their predecessors, chlorofluorocarbons (CFCs). Polyol esters are a group of synthetic lubricants that have been found compatible with many refrigerant types, including the newer HFCs (hydrofluorocarbons) and HCFCs.
Polyol esters are chosen over other synthetic lubricants like Polyalkylene Glycol, Polyalphaolefin, and Polyvinyl ether because they offer better miscibility with HCFC refrigerants. This compatibility is crucial for the efficiency and proper operation of refrigeration and air conditioning systems using these blends.
These refrigerants and their associated lubricants are critical in various applications, including the manufacture of silicones, methyl cellulose, synthetic rubber, as industrial solvents and in fire extinguishers.