US 11,931,702 B2
Apparatus for purifying crystals using solvent vapors
Pratt Bethers, Arvada, CO (US); and David Goodman, III, Federal Heights, CO (US)
Assigned to West Edison, Inc., Aurora, CO (US)
Filed by Pratt Bethers, Arvada, CO (US); and David Goodman, III, Federal Heights, CO (US)
Filed on Mar. 30, 2021, as Appl. No. 17/217,255.
Application 17/217,255 is a continuation of application No. 16/025,771, filed on Jul. 2, 2018, granted, now 10,960,322.
Claims priority of provisional application 62/543,792, filed on Aug. 10, 2017.
Prior Publication US 2021/0236954 A1, Aug. 5, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. B01D 9/00 (2006.01)
CPC B01D 9/0045 (2013.01) [B01D 9/0036 (2013.01); B01D 2009/0086 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A method of purifying crystals using solvent vapor through dynamic equilibrium, comprising:
providing a vessel containing a liquefied gas solvent, and an impure crystalline starting material;
heating the vessel to apply pressure to the contents of the vessel; and
reclaiming solvent from the vessel while leaving crystals and impurities in the vessel.