| 摘要 |
PURPOSE:To obtain the titled substance economically in high yield, by subjecting dishloromethane and HF to gaseous-phase reaction at a specific temperature in the presence of a catalyst consisting of chromium fluoride or obtained by mixing chromium fluoride with a carrier followed by molding the blend, or supporting it on the carrier. CONSTITUTION:CH2Cl2 is reacted with HF in a gaseous phase at 200-500 deg.C (preferably at 300-450 deg.C) in the presence of a catalyst consisting of chromium fluoride or obtained by blending it with a carrier(e.g., active carbon) followed by molding, or supporting it on the carrier, to give the titled substance. CrF3 is used as chromium fluoride, or it is obtained by fluorinating a chrominum compound(e.g., chromium oxide, chromium hydroxide, chromium chloride) and used, and, when the compound contains a chromiun compound except CrF3, it is necessary to fluorinate the compound after molding or supporting on the carrier. |
