| 摘要 |
<p>PURPOSE:To mass-produce HFC-32 which is a substitute fluorocarbon without destroying the ozonosphere. CONSTITUTION:A fluorinating catalyst, comprising elements of zinc, chromium, oxygen and fluorine having high activity in the fluorinating reaction of dichloromethane with HF and having 5-50% fluorination ratio expressed by the formula {Y/(2X+3)}X100% (X is the atomic ratio of the zinc to the chromium contained in the catalyst; Y is the atomic ratio of the fluorine to the chromium) at 0.01-0.6 atomic ratio of the zinc to the chromium is used.</p> |
