| 摘要 |
<p>Vinyl fluoride and 1,1-difluoroethane are obtained by passing a mixture of ethylene dichloride or vinyl chloride or both and hydrogen fluoride over a chromium oxide catalyst at 200 DEG to 500 DEG C. From 2 to 20 moles of hydrogen fluoride may be used per mole of ethylene dichloride and/or vinyl chloride. Vinyl chloride and 1,1-difluoroethane may be separated from the reaction product and recycled. The catalyst may be granular or shaped hydrous chromium oxide, or co-precipitated chromium oxide and alumina, or chromium oxide on an alumina support. Examples are given.</p> |
