| abstract |
In accordance with the present invention a composition is provided. The composition comprises Z-1,1,1,4,4,4-hexafluoro-2-butene (Z-HFO-1336mzz) and 2,2-dichloro-1,1,1-trifluoroethane (HCFC-123). Also in accordance with the present invention a method is provided for topping-off or replenishing a refrigerant charge. The method comprises adding a second refrigerant to a refrigeration, air conditioning, heat pump or power cycle system containing HCFC-123 as a first refrigerant, wherein said second refrigerant comprises Z-HFO-1336mzz and optionally HCFC-123, thus producing a refrigerant composition comprising the first refrigerant and the second refrigerant. Also in accordance with the present invention another method is provided. The method comprises replacing HCFC-123 in a refrigeration, air conditioning, heat pump or power cycle system with a refrigerant composition comprising Z-HFO-1336mzz and optionally HCFC 123. |