Treatment of spent hydrorefining catalysts by selective chlorination
- Lab. d`Environment et de Mineralurgie, Vandoeuvre (France)
- INASMET Centro Tecnologico de Materiales, San Sebastian (Spain)
Spent hydrorefining catalysts contain about 5% of CoO and/or NiO, 12% of MoO{sub 3} and up to 10% of V{sub 2}O{sub 5}. They are generally supported by alumina and contain up to 25% of C, S and hydrocarbons. Such materials are potentially hazardous to the soil and to water resources. Selective chlorination of raw unroasted samples with Cl{sub 2} + air gas mixture had been investigated. At temperatures lower than 600 C, it was possible to recover more than 90% of nickel and cobalt chlorides, about 99% of the molybdenum and up to 75% of vanadium chlorinated compounds. CoCl{sub 2} and NiCl{sub 2} were extracted from the chlorination residues by their dissolution with acidified water. Molybdenum and vanadium chlorinated compounds were recovered by selective condensation from the vapor phase. The chlorination of Al{sub 2}O{sub 3} could be limited to less than 6%. The scale up of this treatment was successful and a flow-sheet is proposed.
- OSTI ID:
- 72831
- Report Number(s):
- CONF-950201--; ISBN 0-87339-287-6
- Country of Publication:
- United States
- Language:
- English
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Processing of spent hydrorefining catalysts by selective chlorination
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