Distillation: processes – separatory – Adding material to distilland except water or steam per se
Patent
1994-09-20
1998-02-17
Manoharan, Virginia
Distillation: processes, separatory
Adding material to distilland except water or steam per se
203 67, 423488, 570178, B01D 336, C07C 1738
Patent
active
057188076
ABSTRACT:
The disclosure relates to removing impurities from hexafluoroethane (CF.sub.3 CF.sub.3), also known as PerFluoroCarbon 116 (PFC-116) or FluoroCarbon 116 (FC-116), by using azeotropic distillation such that an overhead product containing an HCl-hexafluoroethane is formed, optionally combined with a phase separation step to break the HCl-hexafluoroethane azeotropic or azeotrope-like composition thereby permitting recovery of substantially pure hexafluoroethane. Unreacted hydrogen fluoride (HF) may be removed from hexafluoroethane during the above azeotropic distillation with HCl or alternatively by an azeotropic distillation wherein an HF-hexafluoroethane azeotropic or azeotrope-like composition exits overhead and substantially pure HF exits in the bottoms stream.
REFERENCES:
patent: 3505233 (1970-04-01), Clark et al.
patent: 4950364 (1990-08-01), Wismer
patent: 5196616 (1993-03-01), Lee et al.
patent: 5211817 (1993-05-01), Adams et al.
patent: 5211867 (1993-05-01), Shankland et al.
patent: 5258561 (1993-11-01), Nappa et al.
patent: 5340490 (1994-08-01), Decaire et al.
patent: 5346595 (1994-09-01), Clemmer et al.
patent: 5421964 (1995-06-01), Mahler et al.
patent: 5453551 (1995-09-01), Lacroix et al.
patent: 5523499 (1996-06-01), Corbin et al.
A.J. Waytek, The Role Of Fluorocarbon Gases In The Microelectronics Industry, 1986, 331-334.
Blanchard, Wendlinger and Canesson, Heterogeneous Catalytic Reactions Of Chlorofluorocarbons, 1990, 123-128.
W. Schotte, Collection Of Phase Equilibrium Data For Separation Technology, 1980, 432-439.
Harold R. Null, Phase Equilibrium In Process Design, 1970, 124-126.
Stanley M. Walas, Phase Equilibrium In Chemical Engineering, 1985, 165-244.
Reid, Prausnitz and Poling, The Properties Of Gases & Liquids, 4th Edition, 241-387.
Deschere Mark Richard
Mahler Barry Asher
Miller Ralph Newton
Muthu Olagappan
E. I. Du Pont de Nemours and Company
Manoharan Virginia
Shipley James E.
LandOfFree
Purification process for hexafluoroethane products does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Purification process for hexafluoroethane products, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Purification process for hexafluoroethane products will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1781447