While browsing through the supply closet behind my office, I ran across a case of Freon-based tape drive cleaner which lists the contents as
Trichlorotrifluoroethane and isopropyl alcohol. The tape drives that it was used to clean are long gone, and it's probably been sitting here for
~8 years. Any novel uses come to mind?Eclectic - 20-2-2005 at 22:09
It can be converted to 1,1,1,trifluoro,2,2,2,trichloroethane and hydrolized to trifluoroacetic acid. Mixed 1:1 with anhydrous isopropanol, it's
a great circuit board cleaner.FrankRizzo - 20-2-2005 at 22:13
Quote:
Mixed 1:1 with anhydrous isopropanol, it's a great circuit board cleaner.
For cleaning off fluxes and such?
[Edited on 21-2-2005 by FrankRizzo]Mr. Wizard - 20-2-2005 at 22:30
Was it 1,1,2-Trichloro-1,2,2-Trifluoroethane; Freon R 113? This was used as a cleaning agent in electronics, and machinery. It has a BP of 47 C.
It's getting rather scarce now, and I saw a price of over $700 on a 100 pound drum on a web site specializing in Freon recycling. How would you
rearrange it to 1,1,1-Trichloro-2,2,2-Trifluoroethane ? I think it was also used in vapor phase parts cleaning.Eclectic - 21-2-2005 at 07:03
Yes, flux cleaner. The mix quickly dissolves flux without attacking most plastics.
R113 rearranges almost 100% when refluxed a few hours with certain metal chlorides. There are patents... http://v3.espacenet.com/textdoc?DB=EPODOC&IDX=US5430201&...
[Edited on 21-2-2005 by Eclectic]Mr. Wizard - 21-2-2005 at 07:39
Obviously CCl3-CF3 gives off energy when forming, but it would seem the initial product CCl2F-CF2Cl would be the more stable, as the crowding of the
large Chlorine atoms would seem to be a problem in the final arrangement. The Fluorine must prefer it the other way though, pulling the lion's
share of the electrons to one end of the molecule.chloric1 - 21-2-2005 at 09:31
Absorb the alcohol with barium oxide or calcium chloride, etc. and the Freon can be used as a CCl4 alternative.
