Hydrocarbon additives for 1234yf and hfc compositions, methods for their production, storage and usage
AssigneeThe Chemours Company Fc, LLC
InventorsSHENG PENG, BARBARA HAVILAND MINOR
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Abstract
The disclosure relates to compositions comprising HFO-1,1,1,2-tetrafluoropropene (HFO-1234yf) at least one of HFC-32 (1,1-difluoromethane), HFC-134a (1,1,1,2-tetrafluoroethane), pentafluoroethane (HFC-125) and carbon dioxide and at least one additive selected from one or more C3-C4 hydrocarbons, xylenes, methylstyrenes, and combinations thereof which functions as a fluoroolefin oligomerization/polymerization inhibitor or chain transfer component, to prevent oligomer or polymer by-product formation.
Claims34
A composition comprising:
- (i) at least HFO-1234yf;
- (ii) at least one of a C1 and/or C2 hydrofluorocarbon, and optionally carbon dioxide;
- (iii) an effective stabilizing amount of at least one oligomerization inhibitor comprising one or more of a C2-C5 hydrocarbons, a limonene, a pinene, a terpinene, a xylene, and combinations thereof;
- and,
- (iv) optionally, at least one additional HFO, HCFO, HFC different from (ii), HCC, HCFC, nitrogen, and air component.
(canceled)
12-13. (canceled)
A process of forming a stable refrigerant composition comprising, adding up to about 0.5 wt. % of at least one or more C3-C4 hydrocarbons, d-limonene, l-limonene, β-pinene, α-pinene, α-terpinene, β-terpinene, γ-terpinene, and δ-terpinene, d-limonene/propane, l-limonene/propane, β-pinene/propane, α-pinene/propane, α-terpinene/propane, β-terpinene/propane, γ-terpinene/propane, and δ-terpinene/propane, d-limonene/cyclopropane, l-limonene/cyclopropane, β-pinene/cyclopropane, α-pinene/cyclopropane, α-terpinene/cyclopropane, β-terpinene/cyclopropane, γ-terpinene/cyclopropane, and δ-terpinene/cyclopropane, d-limonene/butane, l-limonene/butane, β-pinene/butane, α-pinene/propane, α-terpinene/butane, β-terpinene/butane, γ-terpinene/butane, and δ-terpinene/butane, d-limonene/isobutane, l-limonene/isobutane, β-pinene/isobutane, α-pinene/isobutane, α-terpinene/isobutane, β-terpinene/isobutane, γ-terpinene/isobutane, and δ-terpinene/isobutane, d-limonene/butene, l-limonene/butene, β-pinene/butene, α-pinene/butene, α-terpinene/butene, β-terpinene/butene, γ-terpinene/butene and δ-terpinene/butene to one of:
- a. from about 55 about 75 weight percent HFO-1234yf and about 25 weight percent to 45 weight percent HFC-134a;
- b. from about 56 about 75 weight percent HFO-1234yf and about 25 weight percent to 44 weight percent HFC-134a;
- or
- c. about 56 weight percent HFO-1234yf and 44 weight percent HFC-134a, optionally including a lubricant;
- d. about 24.3 weight percent HFC-32, about 24.7 weight percent HFC-125, about 25.3 weight percent HFO-1234yf, and about 25.7 weight percent HFC-134a, optionally including a lubricant;
- e. about 21.5 weight percent HFC-32 and about 78.5 weight percent HFO-1234yf, optionally including a lubricant;
- f. 30% HFC-125, 14% HFC-134a, 36% HFC-32, 14% HFO-1234yf and 6% CO, optionally including a lubricant;
- g. about 30 weight percent HFC-125, about 14 weight percent HFC-134a, about 36 weight percent HFC-32 and about 6 weight percent CO2;
- and,
- h. from about 28 to about 32 weight percent HFO-1234yf and about 68 weight percent to 72 weight percent HFC-32.
(canceled)
20-22. (canceled)
A method of stabilizing an HFO-1234yf blend comprising adding to the blend one of limonene, pinene, ethane, propane, cyclopropane, propylene, butane, isobutane, butene, isobutene, meta-, ortho- or para-xylene, alpha (α)-methyl styrene, 2-methyl-alpha-methylstyrene (α, 2-dimethylstyrene), 3-methyl-alpha-methylstyrene (α, 3-dimethylstyrene), and 4-methyl-alpha-methylstyrene (α, 4-dimethylstyrene) in an amount effective to inhibit oligomerization of HFO-1234yf without affecting performance or compatibility of the stabilized blend, even when combined with refrigerant oils and other conventional additives.
A stabilized HFO-1234yf blend comprising one of ethane, propane, cyclopropane, propylene, butane, isobutane, butene, and isobutene, meta-, ortho- or para-xylene, alpha (α)-methyl styrene, 2-methyl-alpha-methylstyrene (α, 2-dimethylstyrene), 3-methyl-alpha-methylstyrene (α, 3-dimethylstyrene) and 4-methyl-alpha-methylstyrene (α, 4-dimethylstyrene) in an amount effective to inhibit oligomerization of HFO-1234yf without affecting performance or compatibility of the stabilized blend, even when combined with refrigerant oils and other conventional additives.
(canceled)
28-30. (canceled)
A composition comprising:
- (i) at least HFO-1234yf;
- (ii) at least one of a C1 and/or C2 hydrofluorocarbon, and optionally carbon dioxide;
- (iii) an effective stabilizing amount of at least one oligomerization inhibitor, wherein the inhibitor is xylene and comprises one of meta-, ortho-para-xylene;
- and,
- (iv) optionally, at least one additional HFO, HCFO, HFC different from (ii), HCC, HCFC, nitrogen, and air component.
Dependencies are inferred from the claim text.