Lubricant for Low Global Warming Potential Refrigerant Systems

Inactive Publication Date: 2017-01-05
THE LUBRIZOL CORP
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  • Abstract
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Benefits of technology

[0021]The disclosed technology further provides the use of an ester of one or more branched carboxylic acids in combination with a

Problems solved by technology

With regard to efficiency in use, it is important to note that a loss in refrigerant thermodynamic performance or energy efficiency may have secondary environmental impacts through increased fossil fuel usage arising from an increased demand for electrical energy.
Unfortunately, some compounds which might otherwise be desirable for used in refrigerant compositions are flammable and classified as 2 and 3 by ASHRAE.
For example, the fluoroalkane difluoroethane (HFC-152a) is flammable A2 and therefore not viable for use in neat form in many applications.
As such, many solubility and miscibility problems occur when conventional lubri

Method used

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examples

[0094]A series of ester lubricants are prepared, suitable for use in working fluids that contain low GWP refrigerants. The table below summarizes the acid and polyol used in the preparation of each ester where PE is pentaerythritol, DiPE is di-pentaerythritol, NPG is neopentylglycol, 2-MeBu is 2-methylbutanoic acid, 3-MeBu is 3-methylbutanoic acid, nC5 is pentanoic acid, nC7 is heptanoic acid, nC8-10 is a mixture of octanoic acid and decanoic acid, and iC9 is 3,5,5-trimethylhexanoic acid.

TABLE 1Ester SummaryAlcoholsAcidsEster IDPEDiPENPG2-MeBu3-MeBunC5nC7nC8-10iC9Ester AXXEster BXXEster CXXEster DXXEster EXXXXEster FXXXXXEster GXXXXXEster HXXXXXEster IXXXXXEster JXXXXXEster KXXXEster LXXXXEster MXXXXXEster NXXXXXEster OXXXXEster PXXEster QXXXXEster RXXXXEster SXXXXXEster TXXXXX

[0095]Each ester is prepared using an essentially identical process. The alcohols and acids for each ester, as indicated in the table above, are combined in stoichiometric ratios determined by considering the spe

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Abstract

The disclosed technology relates to a working fluid for a low global warming potential (GWP) refrigeration system that includes a compressor, where the working fluid includes an ester based lubricant and a low GWP refrigerant, and where the ester based lubricant includes an ester of one or more branched carboxylic acids where said branched carboxylic acid contains 8 or less carbon atoms. The disclosed technology provides commercially useful low GWP working fluids (commercially useful working fluids based on low GWP refrigerants) that do not have the solubility and/or miscibility problems commonly seen in low GWP fluids, including high viscosity fluids and applications.

Description

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Claims

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Application Information

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Owner THE LUBRIZOL CORP
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