Method for flushing a refrigeration system

Details Method for flushing a refrigeration system Method for flushing a refrigeration system

1994-09-19

1995-09-26

Willis, Jr., Prince

Refrigeration

Processes

Lubricant handling

252 68, 62114, C02F 502, F25B 4302

Patent

active

054525861

ABSTRACT:
Certain organic diesters and triesters have been found to be useful as flushing oils in retrofitting CFC-based cooling systems to HFC-based cooling systems. These include compositions of the formulae R.sub.1 OOC--Q--COOR.sub.2, ##STR1## and mixtures thereof, wherein Q is a straight- or branched-chain hydrocarbon group having from 2 to 10 carbon atoms and R.sub.1, R.sub.2 and R.sub.3 can be the same or different and are straight- or branched-chain hydrocarbon groups containing from 6 to 13 carbon atoms. In use as a flushing oil, the lubricating oil is drained, the flushing oil is added and the system is run for about 24 hours. This oil is then drained and fresh flushing oil is added. The process is repeated until the original lubricating oil is within a desired range of the total flushing oil, say up to about 5% wt.

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