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Issue
HWAHAK KONGHAK,
Vol.37, No.5, 646-651, 1999
CFC-113의 이성화 및 수소화에 의한 HCFC-123의 합성
Synthesis of HCFC-123 by Isomerization and Hydrogenation of CFC-113
하백현, 백성엽, 박태진, 박건유
Mn과 Cr 금속 분말이 첨가된 염화알루미늄 촉매 상에서 CFC-113(CF2Cl-CfCl2)의 이성화 반응을 수행하고 반응 결과 얻어진 CFC-113a(CF3-CCl3)를 활성탄에 담지된 Pt 또는 Pd 촉매 상에서 수소화 하여 HCFC-123(CF3-CCl2H)을 얻었다. 이성화 반응에 있어서는 Cr 또는 Mn의 첨가에 의하여 염화알루미늄 촉매의 수명이 증가하였으며 두 금속을 동시에 첨가했을 때 더욱 증가하였다. CFC-113a의 수소화 반응에서는 활성이나 수율 면에서 Pd/활성탄 보다 Pt/활성탄 촉매가 우수하여 최대 약 95%의 수율이 얻어졌으며 촉매의 활성이 활성탄 종류의 영향을 받는 것을 관찰하였다. 반응온도가 높아짐에 따라 전환율과 HCFC-123의 수율이 상승하여 120oC에서 최대 수율에 도달하나 그 이상의 온도에서는 HCFC-133a(CF3-CClH2)의 생성이 증가하며 수율이 크게 감소하였다.
CFC-113(CF2Cl-CfCl2) was isomerized to CFC-113a(CF3-CCl3) over aluminum chloride catalyst with the addition of manganese and chromium metal powder. Then the product CFC-113a was hydrodehalogenated to HCFC-123(CF3-CCl2H) over Pt or Pd catalysts supported on activated carbon. The life of aluminum chloride catalyst was extended by the addition of manganese and chromium, and a synergic effect was observed when the two were added simultaneously. The conversion of CFC-113a over Pt/carbon catalyst was higher than that over Pd/carbon and reached up to 95%. The activity of the catalyst was found to be dependent on the property of the active carbon support. The conversion and the yield of CFC-123 increased as the reaction temperatues was elevated and reached the maximum at 120oC, However, the yield of HCFC-123 starts decreasing rapidly at the temperature higher than 120oC due to the formation of HCFC-133a(CF3-CClH2).
Keywords: CFC-113; CFC-113a; HCFC-123; Isomerization; Hydrogenation
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