Synthesis of HFC-134a by isomerization and hydrogenation |
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| Authors: | Dong Jin Suh Tae-Jin Park Byung-Gwon Lee Kun-You Park |
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| Affiliation: | (1) Division of Chemical Engineering, Korea Institute of Science and Technology, P.O. Box 131, 130-650 Cheongryangm,Seoul, Korea;(2) Division of Environmental & CFC Technology, Korea Institute of Science and Technology, P.O. Box 131, Cheongryang, 130-650 Seoul, Korea |
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| Abstract: | For the preparation of HFC-134a, the isomerization of CFC-114 and the hydrogenation of CFC-114a were investigated. Both reactions
were catalyzed by AlC3 and supported Pd catalysts, respectively. For the comparison purpose, the isomerization of CFC-113 was carried out also.
With virgin AICI3 catalyst, both isomerization reactions proceeded after a certain induction period probably because the catalyst needed the
activation by the halogen exchange. The catalyst deactivated gradually with the time on stream. However, the deactivation
rate could be reduced by removing impurities from the reactants. Isomerization rate of CFC-114 was much slower than that of
CFC-113. Palladium supported on carbon catalyzed the hydrogenation reaction quite selectively while the selectivity declined
when the support was replaced with different supports. The catalytic activity and selectivity to desired products increased
in the following order. Pd/kieselguhr Pd/silica-alumina ≅Pd/silica gel Pd/TiO2Pd/Al2O3Pd/C |
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| Keywords: | HFC-134a Isomerization Hydrogenation AICl3 Pd Catalysts |
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