US 11,987,553 B2
Methods for removal of sulfur dioxide (SO2) from trifluoroacetyl chloride (TFAC)
Haluk Kopkalli, Staten Island, NY (US); Haiyou Wang, Amherst, NY (US); Terris Yang, East Amherst, NY (US); Jennifer W. McClaine, Branchburg, NJ (US); Richard Wilcox, West Caldwell, NJ (US); Joshua Close, Cheektowaga, NY (US); and Rajendar Mallepally, Charlotte, NC (US)
Assigned to Honeywell International Inc., Charlotte, NC (US)
Filed by Honeywell International Inc., Charlotte, NC (US)
Filed on Sep. 3, 2021, as Appl. No. 17/466,704.
Claims priority of provisional application 63/222,801, filed on Jul. 16, 2021.
Claims priority of provisional application 63/077,352, filed on Sep. 11, 2020.
Prior Publication US 2022/0081386 A1, Mar. 17, 2022
Int. Cl. C07C 71/00 (2006.01); B01D 3/36 (2006.01); B01D 53/02 (2006.01); B01J 20/18 (2006.01); C07C 51/64 (2006.01); C07C 53/48 (2006.01)
CPC C07C 71/00 (2013.01) [B01D 3/36 (2013.01); B01D 53/02 (2013.01); B01J 20/18 (2013.01); C07C 51/64 (2013.01); C07C 53/48 (2013.01); B01D 2253/108 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method for removing sulfur dioxide (SO2) from trifluoroacetyl chloride (TFAC), comprising the steps of:
conveying a feed stream to a distillation column, the feed stream comprising trifluoroacetyl chloride (TFAC) and sulfur dioxide (SO2);
forming an azeotrope or azeotrope-like composition consisting essentially of effective amounts of trifluoroacetyl chloride (TFAC) and sulfur dioxide (SO2);
collecting the distillate from the distillation column, the distillate comprising the azeotrope or azeotrope-like composition; and
collecting a bottoms product from the distillation column, the bottoms product consisting essentially of trifluoroacetyl chloride (TFAC).
 
2. A method for removing sulfur dioxide (SO2) from trifluoroacetyl chloride (TFAC), comprising the steps of:
conveying a feed stream to a distillation column, the feed stream comprising trifluoroacetyl chloride (TFAC), and sulfur dioxide (SO2);
forming an azeotrope or azeotrope-like composition consisting essentially of effective amounts of trifluoroacetyl chloride (TFAC) and sulfur dioxide (SO2);
collecting the distillate from the distillation column, the distillate comprising the azeotrope or azeotrope-like composition;
collecting a bottoms product from the distillation column;
contacting the bottoms product from the distillation column with a solid adsorbent; and
collecting a product stream consisting essentially of trifluoroacetyl chloride (TFAC).