Organic compounds -- part of the class 532-570 series – Organic compounds – Halogen containing
Patent
1998-07-27
2000-06-20
Siegel, Alan
Organic compounds -- part of the class 532-570 series
Organic compounds
Halogen containing
20415795, C07C 1738
Patent
active
060779829
ABSTRACT:
In the synthesis of 1,1,1,3,3-pentafluoropropane (R-245fa), a mixture of R-245fa and the impurity 1-chloro-3,3,3-trifluoropropene (R-1233zd) is purified and R-1233zd is removed from the mixture by contacting the mixture with 1-5 mols of chlorine for each mol of R-1233zd in the presence of ultraviolet light having a wavelength between about 300 to 400 nm which provides at least 0.02 watts-hour/kg of the mixture, the R-1233zd being reduced to below 10 wt. ppm or lower, as it is converted to 1,2,2-trichloro-3,3,3-trifluoropropane (R-233) or other propane which contains more chlorine and which has a higher boiling point than R-245fa and can be separated easily from R-245fa, the photochlorination being effected in a manner such that at least about 96 wt. % of the starting amount of R-245fa is maintained in the mixture.
REFERENCES:
patent: 5336377 (1994-08-01), Yates
patent: 5399796 (1995-03-01), Correia
Fredericks et al., J. Chem. Soc. (1960) 144.
Galiba et al. J. Chem. Soc. (1964) 1321.
Migita et al. Bull. Chem. Soc. Japan 40 (1967) 920.
Zefirov et al. Tetrahedron Letters, vol. 24 No. 46 (1983) pp. 5133-5136.
Gaita Romulus
Yates Stephen Frederic
Allied Signal Inc.
Collazo Marie L.
Friendenson Jay P.
Siegel Alan
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