The present invention provides refrigerant blends which are replacements for chlorodifluoromethane(HCFC-22). The present blends have refrigeration characteristics which are similar to HCFC-22. The blends comprise from about 10 to about 90 weight percent of a first component selected from the group consisting of 1,1,1-trifluoroethane, difluoromethane, propane, and mixtures thereof; from about 1 to about 50 weight percent of a second component selected from the group consisting of hydrofluorocarbon having 1 to 3 carbon atoms, fluorocarbon having 1 to 3 carbon atoms, inorganic compound, and mixtures thereof having a boiling point at atmospheric pressure in the range from about -90 degrees C to less than -50 degrees C; and from about 1 to about 50 weight percent of a third component which is hydrofluorocarbon having 1 to 3 carbon atoms, other than 1,1,1-trifluoroethane, having a boiling point at atmospheric pressure in the range from about -50 degrees C to about 31 10 degrees C. The refrigerant compositions have a vapor pressure substantially equal to the vapor pressure of HCFC-22.
CROSS REFERENCE TO RELATED APPLICATIONS
This application is a division of application Ser. No. 09/562,154 filed Mar. 26, 2001 abandoned, which is a division of application Ser. No. 09/020,662 filed Feb. 9, 1998 (now U.S. Pat. No. 6,113,803), which is a division of application Ser. No. 08/736,613 filed Oct. 24, 1996 (now U.S. Pat. No. 5,736,063), which is a continuation of application Ser. No. 08/452,231 filed May 26, 1995 (abandoned), which is a division of application Ser. No. 07/895,254 filed Jun. 8, 1992 abandoned), which is a continuation of application Ser. No. 07/671,270 filed Mar. 18, 1991 (abandoned).
