Process for recovering group VIB metals from a catalyst

Details Process for recovering group VIB metals from a catalyst Process for recovering group VIB metals from a catalyst

2007-09-14

2011-11-15

Bos, Steven (Department: 1736)

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group vib metal

C423S058000, C423S593100, C423S594130, C502S305000, C502S306000, C502S311000, C502S312000, C502S313000, C502S315000, C502S316000, C502S314000

Reexamination Certificate

active

08057763

ABSTRACT:
The invention relates to a process for recovering Group VIB metals from a catalyst, in particular a spent bulk catalyst, comprising one or more Group VIB metals and one or more Group VIII metals. Further, the invention relates to a solid Group VIB metal compound obtainable by the process according to the invention having the general formula H2XO4, wherein X=W1-yMoy, wherein y is between 0 and 1 and to its use in a process for the manufacture of a fresh catalyst. The process comprises the steps of:a) oxidizing the one or more Group VIB metals to one or more Group VIB metal oxides;b) separating the one or more Group VIB metal oxides from the one or more Group VIII metals;c) dissolving the one or more Group VIB metal oxides in water to produce an aqueous solution of one or more Group VIB metal oxides;d) precipitating the one or more Group VIB metal oxides from the aqueous solution by adding alkaline earth metal (Group IIa) ions to the aqueous solution;e) optionally filtering and washing the precipitate; andf) transforming the precipitate by adding an acid to form a solid metal compound comprising one or more Group VIB metals.

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Z. R. Llanos, et al; “Processes for the Recovery of Metals From Spent Hydroprocessing Catalysts”; Third International Symposium on Recycling of Metals and Engineered Materials; Edited by P.B. Queneau and R.D. Peterson; 995; p. 425-447; The Minerals, Metals & Materials Society.

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