Azeotropic or quasi-azeotropic composition of chloromethane
US-2015353799-A1 · Dec 10, 2015 · US
Hydrofluoropropene refrigerant composition comprising phthalates
US9303198B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9303198-B2 |
| Application number | US-201414277385-A |
| Country | US |
| Kind code | B2 |
| Filing date | May 14, 2014 |
| Priority date | Feb 26, 2009 |
| Publication date | Apr 5, 2016 |
| Grant date | Apr 5, 2016 |
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- Title
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Abstract
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The present invention provides a stabilized refrigerant composition containing a hydrofluoropropene with low global warming potential (GWP) that can remain stable even in the presence of air (oxygen) for a long period of time. More specifically, the present invention provides a refrigerant composition containing a hydrofluoropropene and a stabilizer. The stabilizer is at least one member selected from the group consisting of alkylcatechols, alkoxyphenols, benzoquinones, phenothiazines, and phthalates.
First claim
Opening claim text (preview).
The invention claimed is: 1. A refrigerant composition comprising a hydrofluoropropene and a stabilizer, wherein the stabilizer comprises mono- or di-alkali metal salts of phthalic acid. 2. The refrigerant composition according to claim 1 wherein the hydrofluoropropene is at least one member selected from the group consisting of 2,3,3,3-tetrafluoropropene (HFO-1234yf), (Z- or E-)1,3,3,3-tetrafluoropropene (HFO-1234ze), (Z- or E-) 1,2,3,3,3-pentafluoropropene (HFO-1225ye), 1,1,3,3,3-pentafluoropropene (HFO-1225zc), and 3,3,3-trifluoropropene (HFO-1243zf). 3. The refrigerant composition according to claim 1 comprising the stabilizer in an amount of 0.1 to 5.0 parts by weight per 100 parts by weight of the hydrofluoropropene. 4. The refrigerant composition according to claim 1 further comprising a lubricant. 5. The refrigerant composition according to claim 4 wherein the lubricant comprises at least one member selected from the group consisting of polyalkylene glycols, polyol esters, and polyvinyl ethers, and has a kinematic viscosity at 40° C. of 5 to 400 cSt. 6. The refrigerant composition according to any one of claims 1 to 5 wherein the refrigerant composition is used for at least one member selected from the group consisting of refrigeration systems, refrigerators, mobile air conditioners, coolers (chillers), container freezers, domestic air conditioners, air conditioners for business use, and vapor compression heat pumps such as hot-water supply systems. 7. The refrigerant composition according to claim 1 , wherein the stabilizer comprises mono-alkali metal salts of phthalic acid. 8. The refrigerant composition according to claim 7 , wherein the stabilizer comprises potassium hydrogen phthalate. 9. The refrigerant composition according to claim 7 , wherein the stabilizer comprises sodium hydrogen phthalate. 10. A method for stabilizing a refrigerant composition containing a hydrofluoropropene, the method comprising adding to the refrigerant composition a stabilizer comprising mono- or di-alkali metal salts of phthalic acid. 11. The method for stabilizing a refrigerant composition containing a hydrofluoropropene according to claim 10 , wherein the stabilizer comprises mono-alkali metal salts of phthalic acid. 12. The method for stabilizing a refrigerant composition containing a hydrofluoropropene according to claim 11 , wherein the stabilizer comprises potassium hydrogen phthalate. 13. The method for stabilizing a refrigerant composition containing a hydrofluoropropene according to claim 11 , wherein the stabilizer comprises sodium hydrogen phthalate. 14. A method for evaluating a refrigerant composition comprising a hydrofluoropropene and a stabilizer comprising mono- or di-alkali metal salts of phthalic acid, the method comprising heat-treating the refrigerant composition in the presence or absence of oxygen in an airtight container, and determining the acid content of the refrigerant composition after the treatment. 15. The method for evaluating a refrigerant composition comprising a hydrofluoropropene and a stabilizer comprising mono- or di-alkali metal salts of phthalic acid according to claim 14 , wherein the stabilizer comprises mono-alkali metal salts of phthalic acid. 16. The method for evaluating a refrigerant composition comprising a hydrofluoropropene and a stabilizer comprising mono- or di-alkali metal salts of phthalic acid according to claim 15 , wherein the stabilizer comprises potassium hydrogen phthalate. 17. The method for evaluating a refrigerant composition comprising a hydrofluoropropene and a stabilizer comprising mono- or di-alkali metal salts of phthalic acid according to claim 15 , wherein the stabilizer comprises sodium hydrogen phthalate. 18. A method for evaluating a refrigerant composition comprising hydrofluoropropene, a lubricant, and a stabilizer comprising mono- or di-alkali metal salts of phthalic acid, the method comprising heat-treating the refrigerant composition in the presence or absence of oxygen in an airtight container, and then determining the acid content of the refrigerant composition, and/or the total acid value of the lubricant contained in the heat-treated refrigerant composition. 19. The method for evaluating a refrigerant composition comprising hydrofluoropropene, a lubricant, and a stabilizer comprising mono- or di-alkali metal salts of phthalic acid according to claim 18 , wherein the stabilizer comprises mono-alkali metal salts of phthalic acid. 20. The method for evaluating a refrigerant composition comprising a hydrofluoropropene and a stabilizer comprising mono- or di-alkali metal salts of phthalic acid according to claim 19 , wherein the stabilizer comprises potassium hydrogen phthalate. 21. The method for evaluating a refrigerant composition comprising a hydrofluoropropene and a stabilizer comprising mono- or di-alkali metal salts of phthalic acid according to claim 19 , wherein the stabilizer comprises sodium hydrogen phthalate.
Assignees
Inventors
Classifications
Lubricant compositions compatible with refrigerants · CPC title
Inhibition of oxidation, e.g. anti-oxidants · CPC title
of polyhydroxy compounds · CPC title
Unsaturated fluorinated hydrocarbons · CPC title
Total acid number · CPC title
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Frequently asked questions
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- What does patent US9303198B2 cover?
- The present invention provides a stabilized refrigerant composition containing a hydrofluoropropene with low global warming potential (GWP) that can remain stable even in the presence of air (oxygen) for a long period of time. More specifically, the present invention provides a refrigerant composition containing a hydrofluoropropene and a stabilizer. The stabilizer is at least one member select…
- Who is the assignee on this patent?
- Daikin Ind Ltd
- What technology area does this patent fall under?
- Primary CPC classification C09K5/04. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Apr 05 2016 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).