C - Chemistry – Metallurgy – 01 – G
Patent
C - Chemistry, Metallurgy
01
G
196/111, 53/142,
C01G 31/02 (2006.01) C01G 31/00 (2006.01)
Patent
CA 1185202
ABSTRACT A process for the preparation of pentavalent vanadium compounds by reprocessing acid extracts of vanadium-containing catalysts spent in the hydrotreatment of crude or residual oils, characterized in that extracts containing trivalent and tetra- valent: vanadium are oxidized at a pH between 0.5 and 2.6 with an oxygen-containing gas to form concentrates of tetravalent vana- dium, after which oxidation is carried out at a pH between 2.6 and 4.0 with an oxygen-containing gas to form concentrates of penta- valent vanadium and in that solid vanadium compounds are subse- quently recovered by separating them from the liquid phase.
408746
Baas Albertus H.
Nacken Lambertus J.g.
Marcoux & Sher Swabey Mitchell Houle
Shell Internationale Research Maatschappij B.v.
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