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US 2013/0199219 A1Published application
Refrigerant additive compositions containing perfluoropolyethers
AssigneeE. I. Du Pont de Nemours and Company
InventorsTHOMAS JOSEPH LECK, THOMAS FRANK SATURNO, GREGORY A. BELL
Life of this patent
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Abstract
The present invention relates to compositions and processes of using perfluoropolyether to maintain or improve the oil return, lubrication, cooling capacity, or energy efficiency of a refrigeration, air conditioning or heat transfer system.
Claims8
1-26. (canceled)
A method of producing refrigeration, said method comprising evaporating a composition in the vicinity of a body to be cooled and thereafter condensing said composition;
- wherein said composition consists of:
- a. a refrigerant or heat transfer fluid comprising 2,3,3,3- tetrafluoro-1-propene (CH2═CFCF3) or 1,3,3,3-tetrafluoro-1-propene (CHF═CHCF3);
- and
- b. at least one perfluoropolyether;
- and optionally
- c. a lubricant oil which is mineral oil or synthetic oil selected from the group consisting of alkylbenzene, polyol ester, polyalkylene glycols, polyvinyl ethers, carbonates, polyalphaolefin and combinations thereof;
- wherein said perfluoropolyether has two end groups;
- wherein each of the two end groups of the perfluoropolyether, independently, is either an unfunctionalized, branched or straight chain perfluoroalkyl radical, or a functionalized group selected from the group consisting of esters, hydroxyls, amines, amides, cyanos, carboxylic acids and sulfonic acids;
- and wherein said evaporating and said condensing is in a mobile air-conditioning system.
6 more elements
Dependencies are inferred from the claim text.