Organic compounds -- part of the class 532-570 series – Organic compounds – Halogen containing
Reexamination Certificate
2007-04-17
2007-04-17
Parsa, J. (Department: 1621)
Organic compounds -- part of the class 532-570 series
Organic compounds
Halogen containing
C570S134000
Reexamination Certificate
active
11271580
ABSTRACT:
A continuous, vapor phase method for purifying a crude mixture of 1,1,1,3,3,3-hexafluoropropane and one or more unsaturated fluorocarbon compounds, the process comprising:a) providing a photochlorinator vessel comprising1) a UV lamp unit comprising a UV lamp located in a transparent inner well, the transparent inner well being located within a transparent outer well, the outer well being provided with material for cooling walls of the inner and outer wells; the inner well and the outer well defining separate chambers isolated from each other; and2) a reaction vessel into which the UV lamp unit has been inserted;b) introducing into the reaction vessel a gaseous mixture of Cl2and a distillation inseparable mixture of 1,1,1,3,3,3-hexafluoropropane and one or more unsaturated fluorocarbon compounds;c) reacting, in the gaseous state and in the presence of UV light from the photochlorinator, the mixture with Cl2with the distillation inseparable mixture of 1,1,1,3,3,3-hexafluoropropane and one or more unsaturated compounds to saturate unsaturated fluorocarbons into a reacted mixture, andd) separating a purified 1,1,1,3,3,3-hexafluoropropane product containing less than 1000 ppm, most preferably less than 100 ppm unsaturated fluorocarbons.
REFERENCES:
patent: 5190626 (1993-03-01), Yates et al.
patent: 6274779 (2001-08-01), Vasanth et al.
patent: 6551469 (2003-04-01), Nair et al.
Chiu Yuon
Merkel David C.
Tung Hsuehsung
Honeywell International , Inc.
Parsa J.
Szuch Colleen D.
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