STABILIZED FLUOROOLEFIN REFRIGERANT COMPOSITIONS AND METHODS FOR THEIR PRODUCTION, STORAGE AND USAGE
The present invention relates to refrigerant compositions comprising at least one fluoroolefin, at least one lubricant and an effective amount of at least one inhibitor wherein the inhibitor is present in the fluoroolefin and the lubricant.
1 . A refrigerant composition comprising:
a. HFO-1234ze, HFO-1243zf, greater than 99 wt. % HFO-1234yf hydrofluoroolefin, and optionally at least one of HFO-1225ye and trifluoropropyne,
b. at least one lubricant,
c. at least one member selected from the group consisting of air, oxygen, cumene hydroperoxide, and fluoroolefin polyperoxides, peroxides, hydroperoxides, persulfates, percarbonates, perborates and hydropersulfates, and
d. a liquid inhibitor in an amount of between about 10 and about 1000 ppm which remains liquid in at least one of an evaporator or a compressor sump under operating conditions and comprises at least limonene to render the composition with less than about 0.03 wt. % of homopolymeric and oligomeric products derived from at least the HFO-1234yf hydrofluoroolefin.
2 . The refrigerant composition of claim 1 , wherein the composition comprises less than about 0.003 wt % of homopolymeric and oligomeric products.
3 . The refrigerant composition of claim 1 , further comprising at least one additional compound selected from the group consisting of R1114, R1123, R1131a, trans-R1131, R1140, R1214ya, R1216, R1224yd, R1225ye(E), R1233zd(E), R1234ze(E), R1252, R143a, R225, R245eb and R254eb, R263fb, R236fa, R142b, R244cc, R1223, R1132a, R2316, R1327 isomer, R1336mzzE, R1336 isomer, R1234zeZ and R1224 isomer, wherein the total amount of additional compounds is greater than 0 and less than about 1 wt. %.
4 . The refrigerant composition of claim 1 , wherein the liquid inhibitor is present in an amount of between about 10 and about 500 ppm.
5 . The refrigerant composition of claim 1 , further comprising at least one member selected from the group consisting of HFC-32, HFC-125, HFC-134a, HFC-152a, HFC-236fa, HFC-227ea and carbon dioxide.
6 . The refrigerant composition of claim 1 , further comprising at least one member selected from the group consisting of HCFO-1233xf, HFC-244bb and HFC-245cb.
7 . The refrigerant composition of claim 1 , further comprising at least one member selected from the group consisting of HCC-40, HCFC-22, CFC-115, HCFC-124, HCFC-1122, and CFC-1113.
8 . The refrigerant composition of claim 1 , further comprising up to 1000 ppm of at least one antioxidant selected from the group consisting of butylated hydroxytoluene, butylated hydroxyanisole, tertiary-butylhydroquinone, gallate, 2-phenyl-2-propanol, 1-(2,4,5-trihydroxyphenyl)-1-butaone, phenolics, bisphenol methane derivatives, and 2,2′-methylene bis(4-methyl-6-t-butyl phenol).
9 . The composition of claim 1 , further comprising at least one member selected from the group consisting of HFC-236ea, HFC-245fa and wherein the HFO-1225ye comprises HFO-1225ye (Z).
10 . The composition of claim 9 , wherein the at least one member comprises HFO-1225ye (Z).
11 . The refrigerant composition of claim 1 , wherein the liquid inhibitor comprises d-limonene and the at least one lubricant comprises POE.
12 . The composition of claim 1 , wherein the liquid inhibitor is miscible in at least one lubricant.
13 . The composition of claim 1 , wherein the air is present in an amount of between about 10 ppm and about 2000 ppm.
14 . A pressure resistant container filled with the refrigerant composition of claim 1 .
15 . A process comprising,
a) removing an existing refrigerant composition from a refrigerant system,
b) providing a pressure resistant container with the composition of claim 1 , and
c) replacing the existing refrigerant with the composition of b).
16 . A refrigerant composition consisting essentially of:
a) hydrofluoroolefins comprising at least HFO-1234ze, HFO-1225ye, HFO-1234yf and HFO-1243zf, and trifluoropropyne, the HFO-1234yf being present in an amount greater than 99 wt. %,
b) at least one initiator compound in an amount up to 15,000 ppm,
c) an inhibitor which remains liquid at temperatures up to 150° C., in an amount up to 1000 ppm which reduces, if not eliminates, conversion of at least HFO-1234yf into polymeric products, the inhibitor being selected from the group consisting of limonene and α-terpinene, and
d) optionally, at least one component selected from the group consisting of a lubricant, an antioxidant, an acid scavenger, a performance enhancer, a phosphate lubricant stabilizer, and a flame suppressant.
17 . The refrigerant composition of claim 16 , wherein at least one initiator compound is selected from the group consisting of air, oxygen, cumene hydroperoxide, and fluoroolefin polyperoxides, peroxides, hydroperoxides, persulfates, percarbonates, perborates and hydropersulfates.