| US 7,468,467 B2 | ||
| Process for obtaining a purified hydrofluoroalkane | ||
| Vincent Wilmet, Wavre (Belgium); Francine Janssens, Vilvoorde (Belgium); Lionel Casaubon Seignour, Tavaux (France); Philippe Krafft, Rhode Saint Genese (Belgium); Alain Lambert, Beauvechain (Belgium); and Olivier Buyle, Autre-Eglise (Belgium) | ||
| Assigned to Solvay S.A., (Belgium) | ||
| Filed on Jan. 03, 2007, as Appl. No. 11/649,383. | ||
| Application 11/649383 is a division of application No. 10/344037, granted, now 7,179,949, previously published as PCT/EP01/10064, filed on Aug. 10, 2001. | ||
| Claims priority of application No. 00 10546 (FR), filed on Aug. 10, 2000; application No. 00 10547 (FR), filed on Aug. 10, 2000; application No. 00 10548 (FR), filed on Aug. 10, 2000; application No. 00 10549 (FR), filed on Aug. 10, 2000; application No. 01 03193 (FR), filed on Mar. 07, 2001; and application No. 01 08910 (FR), filed on Jul. 04, 2001. | ||
| Prior Publication US 2007/0112231 A1, May 17, 2007 | ||
| Int. Cl. C07C 17/00 (2006.01); C07C 17/10 (2006.01) | ||
| U.S. Cl. 570—165 [570/178] | 20 Claims |
| 1. Process for obtaining a hydrofluoroalkane comprising at least three carbon atoms, which is purified of organic impurities
including (chloro)fluoro olefins, according to which the hydrofluoroalkane containing organic impurities is subjected to at
least one purification treatment which allows an effective reduction of the content of the olefinic impurities chosen from
(a) a treatment with chlorine in the presence of a initiator wherein said initiator is an electromagnetic radiation comprising
at least one fraction of wavelengths less than 280 nm;
(b) a reaction with hydrogen fluoride;
(c) a distillation in which the purified hydrofluoroalkane is removed from the top of the distillation column or from the
side and wherein the distillation column has at least 10 theoretical plates;
(d) an extractive distillation which is carried out in the presence of at least one extractant selected from the group consisting
of (hydro)chlorocarbon, (hydro)fluorocarbon, hydrochlorofluorocarbon, hydrocarbon, ketone, ether, ester, nitrile, hydrogen
chloride and carbon dioxide;
(f) a reaction with a compound containing oxygen wherein said compound containing oxygen is selected from the group is an
oxygenated acid, an organic peroxide, an inorganic peroxide, a peroxide salt or a peracid;
(g) a gas-phase reaction with a reagent capable of reacting with at least some of the organic impurities, with the exception
of a reaction with elemental chlorine wherein said reagent is hydrogen, hydrogen chloride or hydrogen fluoride; and
(h) a gas-phase reaction with a reagent capable of reacting with at least some of the organic impurities, with the exception
of a reaction with elemental chlorine and wherein the reaction is a catalytic hydrogenation.
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