VERFAHREN ZUR HERSTELLUNG VON 1,1,1,2-TETRAFLUORETHAN AUS 1,1-DICHLOR-1,2,2,2-TETRAFLUORETHAN

VERFAHREN ZUR HERSTELLUNG VON 1,1,1,2-TETRAFLUORETHAN AUS 1,1-DICHLOR-1,2,2,2-TETRAFLUORETHAN

1,1,1,2-Tetrafluoroethane, a refrigerant, is formed with little formation of isomers or chlorofluoroethanes having not very different boiling points by reacting 1,1-dichloro-1,2,2,2-tetrafluoroethane (R-114a), which may contain up to about 25 wt% of 1,2-dichloro-1,1,2,2-tetrafluoroethane (R-114), wi...

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Bibliographische Detailangaben
Hauptverfasser: YAGII, KIYOSHI, FUJIMI, JP, MISHUMI, SADAHARU, KAWAGOE, JP, MURATA, KATSUYOSHI, KAWAGOE, JP, OSHIO, HIDEKI, OMIYA, JP, YOSHIKAWA, SATOSHI, SAITAMA, JP
Format: Patent
Sprache:ger
Schlagworte:
ACYCLIC OR CARBOCYCLIC COMPOUNDS
CHEMISTRY
METALLURGY
ORGANIC CHEMISTRY
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Zusammenfassung:1,1,1,2-Tetrafluoroethane, a refrigerant, is formed with little formation of isomers or chlorofluoroethanes having not very different boiling points by reacting 1,1-dichloro-1,2,2,2-tetrafluoroethane (R-114a), which may contain up to about 25 wt% of 1,2-dichloro-1,1,2,2-tetrafluoroethane (R-114), with hydrogen gas in the presence of a palladium-on-active alumina catalyst at a temperature lower than 200 DEG C. and not lower than 120 DEG C. R-114a almost free of R-114 is obtained by reacting 1,1,1-trichloro-2,2,2-trifluoroethane with hydrogen fluoride in vapor phase in the presence of a catalyst prepared by partially fluorinating gamma -alumina by treatment with hydrogen fluoride gas.