US 7,566,809 B2
	Process for separation of a mixture comprising at least one hydrofluoroalkane
Alain Lambert, Beauvechain (Belgium); and Vincent Wilmet, Wavre (Belgium)
Assigned to Solvay S.A., (Belgium)
Filed on May 25, 2007, as Appl. No. 11/753,970.
Application 11/753970 is a division of application No. 11/476306, filed on Jun. 28, 2006, granted, now 7,223,892.
Application 10/282785 is a division of application No. 09/868368, granted, now 6,521,803, previously published as PCT/EP99/10173, filed on Dec. 16, 1999.
Application 11/476306 is a continuation of application No. 10/282785, filed on Oct. 29, 2002, granted, now 7,074,434.
Claims priority of application No. 9800910 (BE), filed on Dec. 18, 1998.
Prior Publication US 2008/0033219 A1, Feb. 07, 2008
This patent is subject to a terminal disclaimer.
Int. Cl. C07C 17/20 (2006.01)

U.S. Cl. 570—164  [570/165; 570/163; 570/170; 570/175]

20 Claims

1. A process for the manufacture of 1,1,1,3,3-pentafluorobutane, which comprises reacting a chlorinated precursor with hydrogen fluoride to produce 1,1,1,3,3-pentafluorobutane and separating the 1,1,1,3,3-pentafluorobutane by using an azeotropic or pseudo-azeotropic composition which comprises 1.5 mol % to 27.5 mol % of 1,1,1,3,3-pentafluorobutane and 72.5 mol % to 98.5 mol % of hydrogen fluoride.