US 9,809,515 B2
Dehydrofluorination of pentafluoroalkanes to form tetrafluoroolefins
Maher Y. Elsheikh, Wayne, PA (US); Philippe Bonnet, Lyons (FR); Olga C. N. Keeley, San Francisco, CA (US); and Benjamin Bin Chen, Wayne, PA (US)
Assigned to Arkema Inc., King of Prussia, PA (US)
Filed by ARKEMA INC., King of Prussia, PA (US)
Filed on Sep. 29, 2016, as Appl. No. 15/279,680.
Application 15/279,680 is a continuation of application No. 13/695,807, granted, now 9,492,816, previously published as PCT/US2011/034890, filed on May 3, 2011.
Claims priority of provisional application 61/324,056, filed on May 3, 2010.
Prior Publication US 2017/0022128 A1, Jan. 26, 2017
This patent is subject to a terminal disclaimer.
Int. Cl. C07C 17/25 (2006.01); C07C 21/18 (2006.01); B01J 23/26 (2006.01); B01J 27/132 (2006.01); B01J 37/08 (2006.01); B01J 21/18 (2006.01); B01J 37/00 (2006.01); B01J 37/14 (2006.01)
CPC C07C 17/25 (2013.01) [B01J 21/18 (2013.01); B01J 23/26 (2013.01); B01J 27/132 (2013.01); B01J 37/0018 (2013.01); B01J 37/0072 (2013.01); B01J 37/08 (2013.01); B01J 37/14 (2013.01)] 14 Claims
OG exemplary drawing
1. A method for producing 2,3,3,3-tetrafluoropropene (HFO-1234yf) comprising dehydrofluorinating a pentafluoroalkane selected from the group consisting of 1,1,1,2,2-pentafluoropropane (HFC-245cb), 1,1,1,2,3-pentafluoropropane (HFC-245eb), and mixtures thereof in a gas phase in the presence of air and/or oxygen and a calcined chromium oxyfluoride catalyst, containing 1-20 weight % of a co-catalyst selected from the group consisting of Zn, Co, Mn, and Mg, wherein said catalyst is support or unsupported and wherein said catalyst is not activated with hydrogen fluoride and wherein said 2,3,3,3-tetrafluoropropene (HFO-1234yf) is produced directly from said pentafluoroalkane in a single step.