Lubricant including an ester of pyromellitic acid for refrigeration systems
AssigneeThe Lubrizol Corporation
InventorsBridgett K. Rakestraw, David M. Pallister, Andrew D. Sumner, Scott Miller, Zhana Adams
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Abstract
A working fluid includes a lubricant and a refrigerant. The lubricant includes a tetra-alkyl ester of pyromellitic acid (1,2,4,5-benzenetetracarboxylic acid) and the refrigerant may include a hydrofluoroolefin. A method of lubricating a compressor of a refrigeration system includes forming a working fluid in the refrigeration system. The working fluid includes a lubricant and a refrigerant. The lubricant includes a tetra-alkyl ester of pyromellitic acid and the refrigerant may include a hydrofluoroolefin.
Claims21
A working fluid comprising a lubricant and a refrigerant, the lubricant comprising a tetra-alkyl ester of pyromellitic acid,
- wherein a ratio by weight of the tetra-alkyl ester of pyromellitic acid to the refrigerant in the working fluid is from 90:10 to 99:1.
(canceled)
A method of lubricating a compressor of a refrigeration system, comprising forming a working fluid in the refrigeration system, the working fluid including a lubricant and a refrigerant, the lubricant comprising a tetra-alkyl ester of pyromellitic acid, the refrigerant comprising a hydrofluoroolefin, wherein in the compressor, a ratio by weight of the tetra-alkyl ester of pyromellitic acid to the refrigerant in the working fluid is from 90:10 to 99:1.
A method of improving solubility of hydrofluoroolefin refrigerant in a working fluid comprising supplying a lubricant to the working fluid, the lubricant comprising a tetra-alkyl ester of pyromellitic acid, wherein a ratio by weight of the tetra-alkyl ester of pyromellitic acid to the refrigerant in the working fluid is from 90:10 to 99:1.
A method of reducing the occurrence of lubricant foam in an hydrofluoroolefin refrigerant in a compressor, comprising supplying a lubricant to the hydrofluoroolefin refrigerant, the lubricant comprising a tetra-alkyl ester of pyromellitic acid, wherein in the compressor, a ratio by weight of the tetra-alkyl ester of pyromellitic acid to the refrigerant in the working fluid is from 90:10 to 99:1.
Dependencies are inferred from the claim text.