METHOD OF SEPARATING PENTAFLUOROETHANE AND PROCESS FOR PRODUCING PENTAFLUOROETHANE BY UTILIZING SAID METHOD

Title:

METHOD OF SEPARATING PENTAFLUOROETHANE AND PROCESS FOR PRODUCING PENTAFLUOROETHANE BY UTILIZING SAID METHOD

Document Type and Number:

WIPO Patent Application WO/1996/011176

Kind Code:

A1

Abstract:

A method of separating pentafluoroethane (HFC-125) from the reaction mixture in the production of HFC-125 more efficiently and, in particular, in a more simplified manner, which method comprises the step of passing a gaseous mixture comprising perchloroethylene (PCE), HFC-125, hydrogen chloride (HC1) and hydrogen fluoride (HF) through the first condensation step to prepare the first vapor-phase portion, the step of passing the first portion through the second condensation step to prepare the second vapor-phase portion mainly comprising HFC-125 and HC1 and the second liquid-phase portion comprising the rest of the mixture, the step of leading the second liquid-phase portion to the distillation step to prepare a top fraction mainly comprising HFC-125 and HC1 and a bottom fraction substantially free from HFC-125 and HC1 and comprising the rest of the mixture, and the step of removing HC1 from the second vapor-phase portion and the top fraction to prepare HFC-125. The PCE concentration in the second liquid-phase portion is so controlled as not to cause liquid separation.

Inventors:

HOMOTO YUKIO (JP)
SHIBANUMA TAKASHI (JP)
NISHITSUJI MASANOBU (US)

Application Number:

PCT/JP1995/002048

Publication Date:

April 18, 1996

Filing Date:

October 06, 1995

Export Citation:

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Assignee:

DAIKIN IND LTD (JP)
HOMOTO YUKIO (JP)
SHIBANUMA TAKASHI (JP)
NISHITSUJI MASANOBU (US)

International Classes:

C07C17/21; C07C17/38; (IPC1-7): C07C19/08; C07C17/383

Foreign References:

US4766260A	1988-08-23
US5094773A	1992-03-10
US4944846A	1990-07-31
US4911792A	1990-03-27
JPH02196734A	1990-08-03
JPH03176434A	1991-07-31
JPH05306242A	1993-11-19

Other References: