Recovering vanadium pentoxide - from spent catalysts

摘要

Spent catalysts used for oxidation of aromatic or unsatd aliphatic hydrocarbons, esp catalysts contg. V2O5, and TiO5 plus minor amts. of other oxides all supported on an inert carrier, are contacted with CCl4 at =100 degrees C. the volatile reaction mixt. is scrubbed with aq. ammonia, the resulting ammonium vanadate is sepd. and calcined at 200-800 degrees C to recover V2O5. The use of CCl4 as a chlorinating agent is more convenient than the conventional use of SOCl2 or COCl2 which are highly toxic and corrosive.