| 摘要 |
Tantalum and/or niobium pentafluorides may be recovered from a deactivated or partially deactivated hydrocarbon conversion catalyst comprising (a) a metal pentafluoride selected from the group consisting of tantalum pentafluoride, niobium pentafluoride and mixtures thereof and (b) hydrogen fluoride, by distilling said catalyst in the presence of a Lewis acid containing neither of these Group V metals, thereby displacing a pentahalide of tantalum and/or niobium into the vapor phase from which it can be condensed. Addition of hydrogen fluoride then converts the pentahalide to the pentafluoride.
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