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Title:
PROCESS FOR PRODUCING 1,1,1,2,2-PENTAFLUOROETHANE, PROCESS FOR PRODUCING 2,2-DICHLORO-1,1,1-TRIFLUOROETHANE, AND METHOD OF PURIFYING 1,1,1,2,2-PENTAFLUOROETHANE
Document Type and Number:
WIPO Patent Application WO/1994/020441
Kind Code:
A1
Abstract:
A process for producing HFC-125 by dividing the reaction system into a first reaction zone for the vapor-phase reaction of mainly perchloroethylene with HF in the presence of a catalyst and a second reaction zone for the vapor-phase reaction of HCFC-123 (CF3CHC12) and/or HCFC-124 (CF3CFHC1) with HF in the presence of a catalyst, wherein the first reaction zone is kept under a high pressure while the second reaction zone is kept under a low pressure. This process serves to keep a high conversion of perchloroethylene and increase the selectivity of HFC-125 while retaining a catalyst life. A process for purifying HFC-125 by the reaction of a mixture composed of at least 85 vol. % of HFC-125 and at most 15 vol. % of CFC-115 with hydrogen in the presence of a catalyst. This process serves to moderate the reaction conditions, reduce the absolute amount of the by-products formed, and purify HFC-125 efficiently.

Inventors:
SHIBANUMA TAKASHI (JP)
HOMOTO YUKIO (JP)
KOMATSU SATOSHI (JP)
YOSHIMURA TOSHIKAZU (JP)
Application Number:
PCT/JP1994/000348
Publication Date:
September 15, 1994
Filing Date:
March 03, 1994
Export Citation:
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Assignee:
DAIKIN IND LTD (JP)
SHIBANUMA TAKASHI (JP)
HOMOTO YUKIO (JP)
KOMATSU SATOSHI (JP)
YOSHIMURA TOSHIKAZU (JP)
International Classes:
C07C17/20; C07C17/21; C07C17/395; C07C19/08; (IPC1-7): C07C19/08; C07C17/20; C07C17/38; B01J21/06; B01J23/14; B01J23/22; B01J23/26; B01J23/28; B01J23/44; B01J23/46; B01J23/64
Foreign References:
JPH04226927A1992-08-17
JPH01146832A1989-06-08
JPH0692879A1994-04-05
Other References:
See also references of EP 0687660A4
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