R134a as the most widely used in low temperature environmental protection refrigerants, as a result ofHFC134a good comprehensive performance, make it become a kind of very effective and safe substitute CFC - 12, mainly applied in the field, in the use of the majority of refrigerant R12 include: refrigerators, freezers, water dispensers, auto air conditioning, central air-conditioning, dehumidifier, cold storage, commercial refrigeration, ice water machine, ice cream machine, refrigeration condensing units, refrigeration equipment, at the same time also can be used in aerosol propellant, medical, aerosol, insecticides aerosol propellant polymer (plastic) physical foaming agent, and magnesium alloy shielding gas, etc. R134a is the internationally recognized CFC12 best greener alternatives. HFC134 a do not contain chlorine atoms, the damage to the ozone layer can't afford to, has a good safety performance (non-flammable, does not explode, non-toxic, without excitant, non-corrosive); The refrigerating capacity and efficiency and CFC - 12 is very close, so as a good alternative refrigerants in the long run. HFC 134a can be widely used for automobile air conditioner, refrigerator, central air conditioning, commercial refrigeration industry such as refrigerant, and can be used in medicine, pesticides, cosmetics, cleaning industry.