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Azeotrope-like compositions of tetrafluoropropene and hydrofluorocarbons

  • US 8,741,829 B2
  • Filed: 03/26/2012
  • Issued: 06/03/2014
  • Est. Priority Date: 04/29/2004
  • Status: Expired due to Term
First Claim
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1. A heat transfer composition comprising:

  • (1) an azeotrope-like composition; and

    (2) at least one lubricant selected from the group consisting of mineral oil, silicone oil, polyalkyl benzenes (PABs), polyol esters (POEs), polyalkylene glycols (PAGs), polyalkylene glycol esters (PAG esters), polyvinyl ethers (PVEs), poly(alpha-olefins) (PAOs), and combinations of these,wherein said azeotrope-like composition comprises trans-1,3,3,3-tetrafluoropropene (transHFO-1234ze) and 1,1,1,2-tetrafluoroethane (HFC-134a) in amounts effective to form an azeotrope-like composition.

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