US 4,182,747 A · Process for preparation of anhydrous metallic chlorides from waste catalysts

Abstract

A process is disclosed for recovering metallic constituents of spent or waste catalysts containing metallic compounds fixed on an aluminous support. The process is particularly applicable for the recovery of metals such as Al, Mo, V, Ni and Co, contained in spent catalyst. The process comprises transforming the metals to be recovered into volatile chlorides by carbochlorination and then separating the chlorides obtained by dry means and fixing them successively in a selective manner. The separation of AlCl.sub.3 is accomplished by passage through granules of anhydrous NaCl, and the separation of MoCl.sub.5 by passage through granules of crystallized KCl. The process is particularly suitable for the treatment of waste catalyst from the catalytic hydrocracking or hydrodesulfurization of oils.

Claims18

Dependent claims

A process for preparation from waste catalysts on an alumina support base which have been used for the treatment of hydrocarbons, of anhydrous metallic chlorides selected from the group consisting of chlorides of aluminum, molybdenum, vanadium, cobalt and nickel, comprising:

(a) separating hydrocarbons which impregnated the waste catalyst support base during use, under conditions wherein a major portion of carbon present in an uncombined state is not oxidized or removed from within the alumina support base;
(b) chlorinating the waste catalyst treated as in step (a) by subjecting the catalyst to a flow of gaseous chlorine at a temperature sufficient to sequentially reduce metal oxides present and form volatile and non-volatile chlorides of the reduced metals;
(c) passing a gaseous effluent of (b) through an anhydrous sodium chloride at a temperature of between about 115.degree. C. to about 500.degree. C. to selectively fix the aluminum chloride in the form of a complex salt or mixture of low melting point salts;
and;
(d) at least recovering an aluminum chloride product.

2 more elements

(a) separating hydrocarbons which impregnated the waste catalyst support base during use, under conditions wherein a major portion of carbon present in an uncombined state is not oxidized or removed from within the alumina support base;
(b) chlorinating the waste catalyst treated as in step (a) by subjecting the catalyst to a flow of gaseous chlorine at a temperature sufficient to sequentially reduce metal oxides present and form volatile and non-volatile chlorides of the reduced metals;
(c) passing a gaseous effluent of (b) through an anhydrous sodium chloride at a temperature of between about 115.degree. C. to about 500.degree. C. to selectively fix the aluminum chloride in the form of a complex salt or mixture of low melting point salts;
(d) at least recovering an aluminum chloride product;
and
wherein after selective fixation of aluminum chloride by an anhydrous sodium chloride, gases which are not retained are passed through an absorption column which contains generally non-anhydrous crystallized potassium chloride brought to a temperature of 100.degree. to 500.degree. C., which fixes the major part of the molybdenum chloride.

3 more elements

Dependencies are inferred from the claim text.

Process for preparation of anhydrous metallic chlorides from waste catalysts

Life of this patent

Process for preparation of anhydrous metallic chlorides from waste catalysts

Life of this patent

Abstract

Claims18