PROCESS FOR THE PREPARATION OF PENTAFLUOROETHANE

Title:

PROCESS FOR THE PREPARATION OF PENTAFLUOROETHANE

Document Type and Number:

WIPO Patent Application WO/1998/052889

Kind Code:

A1

Abstract:

A method by which pentafluoroethane (HFC-125) can be efficiently separated from a mixture of HFC-125 with chloropentafluoroethane (CFC-115). The process for preparing high-concentration HFC-125 by the extractive distillation of a mixture (2) of HFC-125 with CFC-115 comprises using an ethylene glycol compound (3) represented by the formula: R?1�O(CH�2?CH�2?O)�n?R?2� (wherein R?1� and R?2� are each independently hydrogen or C�1?-C�4? alkyl; and n is an integer of 1 to 3) as the extractant to obtain CFC-115 as the distillate (4) and a mixture of HFC-125 with the extractant as the bottom (5), recovering HFC-125 from the mixture through distillation, and reusing the extractant thus separated for the extractive distillation.

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Inventors:

KOHNO SATORU (JP)
SHIBANUMA TAKASHI (JP)

Application Number:

PCT/JP1998/002170

Publication Date:

November 26, 1998

Filing Date:

May 18, 1998

Export Citation:

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Assignee:

DAIKIN IND LTD (JP)
KOHNO SATORU (JP)
SHIBANUMA TAKASHI (JP)

International Classes:

C07C17/386; C07C19/08; (IPC1-7): C07C19/08; C07C17/386

Domestic Patent References:

WO1996006063A1

1996-02-29

Foreign References:

JPH083082A	1996-01-09
JPH07133240A	1995-05-23

Other References: