Stabilized hydrochlorofluoroolefins and hydrofluoroolefins
Disclosed is a combination of hydrofluoroolefins and/or hydrochlorofluoroolefins with stabilizers wherein the stabilizers minimize the degradation of the hydrofluoroolefins and hydrochlorofluoroolefins during storage, handling and use yet allow for atmospheric degradation. The combinations exhibit low or zero ozone depletion potential and lower global warming potential making them of interest as replacements for chlorofluorocarbons and hydrofluorocarbons. The combinations of the present invention comprise hydrofluoroolefins and/or hydrochlorofluoroolefins in combination with a stabilizer or stabilizers selected from free radical scavengers, acid scavengers, oxygen scavengers, polymerization inhibitors and combinations thereof.
1. A combination comprising a hydrochlorofluoroolefin and a stabilizer consisting of a benzene ring substituted with an unsaturated or —OH group selected from the group consisting of alpha-methylstyrene, limonene oxide, p-methoxyphenol, 4-tert-butylcatechol, 2,6-di-terbutylphenol and mixtures thereof.
2. The combination of claim 1 wherein said hydrochlorofluoroolefin is selected from the group consisting of 1233zd (CF 3 —CH═CHCl), 1233xf (CF 3 —CCl═CH 2 ) and mixtures thereof.
3. The combination of claim 1 wherein said stabilizer is present in an amount of from about 1 to 50,000 ppm.
4. The combination of claim 1 wherein said stabilizer is present in an amount of from about 100 to 1,000 ppm.
5. A heat transfer fluid composition comprising a hydrochlorofluoroolefin and a stabilizer consisting of a benzene ring substituted with an unsaturated or —OH group selected from the group consisting of alpha-methylstyrene, limonene oxide, p-methoxyphenol, 4-tert-butylcatechol, 2,6-di-terbutylphenol and mixtures thereof.
6. The combination of claim 5 wherein said hydrochlorofluoroolefin is selected from the group consisting of 1233zd (CF 3 —CH═CHCl), 1233xf (CF 3 —CCl═CH 2 ) and mixtures thereof.
7. The combination of claim 5 wherein said stabilizer is present in an amount of from about 1 to 50,000 ppm.
8. The combination of claim 5 wherein said stabilizer is present in an amount of from about 100 to 1,000 ppm.
9. The combination of claim 6 wherein less than 0.1 wt % of Z-1233zd forms after ageing E-1233zd and said stabilizer for 24 hours at 140° C.