Development of Azeotropic Blends to Replace TCE and nPB in Vapor Degreasing Operations
Technical Report,01 Sep 2014,01 Jan 2017
Sam Houston State University Huntsville United States
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Azeotropic blends that have similar properties as trichloroethylene TCE and n-propyl bromide nPB but without undesirable environmental, occupational, safety, and health properties were tested as sustainable drop-in replacements for TCE and nPB in vapor phase cleaning operations. No fluids in this study cleaned grease or solder flux residue as well as TCE or nPB. Seven new azeotropic blends were discovered during this project. Four azeotropes failed the flash point test. One failed the vial-based screening test against marine-grade grease. Two of the azeotropic blends survived the flashpoint and solvency screening tests. They are designated AZ6 80 Suprion, 20 p-chlorobenzotrifluoride, Tb 11 deg C and AZ7 65 HFE-7500, 35 p-chlorobenzotrifluoride, Tb 125 deg C.
- Physical Chemistry