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Title:
METHOD FOR PURIFYING HEXAFLUOROETHANE PRODUCT
Document Type and Number:
Japanese Patent JP2009221228
Kind Code:
A
Abstract:

To provide a method for removing impurities from hexafluorocarbon (CF3CF3), also known as PerFluoroCarbon 116 (PFC-116) or FluoroCarbon 116 (FC-116).

The removal of impurities is performed by using azeotropic distillation such that an overhead product consisting essentially of HCl-hexafluoroethane is formed, optionally combined with a phase separation step to separate the HCl-hexafluoroethane azeotropic or azeotrope-like composition into individual components thereby permitting recovery of substantially pure hexafluorocarbon. Unreacted hydrogen fluoride (HF) may be removed from hexafluorocarbon during the above azeotropic distillation or alternatively by an azeotropic distillation wherein an HF-hexafluoroethane azeotropic or azeotrope-like composition is taken out and removed from overhead and substantially pure HF is taken in the bottoms stream.


Inventors:
MILLER RALPH NEWTON
DESCHERE MARK RICHARD
MAHLER BARRY ASHER
MUTHU OLAGAPPAN
Application Number:
JP2009160311A
Publication Date:
October 01, 2009
Filing Date:
July 07, 2009
Export Citation:
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Assignee:
DU PONT
International Classes:
C07C17/383; C07C19/08; C01B7/07; C01B7/19; C07C17/38; C07C17/386
Domestic Patent References:
JPH03114537A1991-05-15
JPH05255144A1993-10-05
JPH05178768A1993-07-20
JPH0532568A1993-02-09
JPH05148170A1993-06-15
Foreign References:
WO1993021140A11993-10-28
Attorney, Agent or Firm:
Junji Yuda
Noriyuki Takebayashi



 
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