Patent ID: 6513338
Filing Date: 2003-02-04
Classification: C09K,F25B,F25J

Abstract:
A process for refrigeration in the 90 to 110 K temperature range, characterized in that a refrigerant mixture is compressed using an oil-lubricated compressor, then cooled to ambient temperature and then oil is removed from the refrigerant mixture before the refrigerant is fed to a Joule Thomson heat exchanger, and in which the refrigerant mixture is additionally cooled after it has been cooled to ambient temperature and before it enters the Joule Thomson heat exchanger, where as refrigerant mixture a mixture is used containing from 0.06 mol/mol to 0.20 mol/mol propane, from 0.26 mol/mol to 0.36 mol/mol nitrogen and from 0.20 mol/mol to 0.38 mol/mol methane, the remainder being ethane.