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US 5,288,643 AGranted
Quick method to distinguish alkylbenzene and naphthenic lubricants in compressors
AssigneeThermo King Corporation
InventorsRajender K. Sadhir, Sung L. Kwon
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Abstract
A method for the identification of whether a lubricant in a compressor is an alkylbenzene or a naphthenic oil. This method comprises adding 3,3-bis (p-hydroxyphenyl) phthalide and observing whether there is an absence or presence of turbidity.
Claims4
A method of distinguishing between an alkyl benzene and a naphthenic lubricant in a sample which comprises:
- a. adding a sufficient amount of 3,3-bis (p-hydroxyphenyl) phthalide to said sample and;
- b. observing the resulting turbidity against a blank, wherein said resulting turbidity indicates said lubricant is naphthenic whereas no turbidity indicates alkyl benzene lubricant.
Dependencies are inferred from the claim text.