Organic compounds -- part of the class 532-570 series – Organic compounds – Halogen containing
Reexamination Certificate
2007-01-09
2007-01-09
Page, Thurman K. (Department: 1621)
Organic compounds -- part of the class 532-570 series
Organic compounds
Halogen containing
C502S185000, C502S313000, C502S355000, C570S177000
Reexamination Certificate
active
10734946
ABSTRACT:
A process is disclosed for purifying a hydrofluoropropane of undesirable C2–C4olefinic and C1–C4saturated chlorinated impurities, comprising the steps of: contacting a first mixture of hydrofluoropropane, olefinic impurity and saturated chlorinated impurity with hydrogen and hydrogen fluoride concurrently in the presence of a bifunctional catalyst, for example an alloy of gold and palladium supported on carbon, capable of catalyzing hydrogenation and fluorination. During the contacting step, olefinic impurity is converted to saturated hydrogenated derivative and/or saturated hydrofluorinated derivative, and saturated chlorinated impurity is converted to a saturated hydrodechlorinated derivative and/or saturated fluorinated derivative. The hydrofluoropropane thus formed is substantially free of both the olefinic and saturated chlorinated impurities and may be used as obtained or subject to further purification steps such as distillation to remove the process derivatives (e.g., hydrogenation, hydrodechlorination and hydrofluorination derivatives) from the hydrofluoropropane.
REFERENCES:
patent: 5001287 (1991-03-01), Fernandez et al.
patent: 5208396 (1993-05-01), Anton
patent: 5447896 (1995-09-01), Rao
patent: 5463152 (1995-10-01), Rao
patent: 5569797 (1996-10-01), Fu et al.
patent: 6147267 (2000-11-01), Sievert et al.
Rao Velliyur Nott Mallikarjuna
Sievert Allen C.
E. I. du Pont de Nemours and Company
Katakam Sudhakar
Maloney Daniel M.
Page Thurman K.
Shipley James E.
LandOfFree
Process for purifying hydrofluoropropanes does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process for purifying hydrofluoropropanes, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for purifying hydrofluoropropanes will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3753844