| 摘要 |
1526927 Recovering vanadium from hydroconversion catalysts SHELL INTERNATIONALE RESEARCH MAATSCHAPPIJ BV 13 Oct 1975 [15 Oct 1974] 44604/74 Heading B1E [Also in Divisions Cl and C5] Vanadium and optionally nickel, is recovered from a catalyst which has become deactivated in a process in which a vanadiumcontaining hydrocarbon oil has been treated with hydrogen and the vanadium content of the catalyst has increased by at least 10 pbw per 100 pbw of catalyst carrier, the recovery of vanadium being achieved by extracting the deactivated catalyst with an aqueous solution of a mineral acid so as to reduce the vanadium content by at least 40% of the vanadium deposited during the catalytic treatment, the vanadium and possibly nickel are then isolated from the solution obtained. Mineral acid solutions exemplified are sulphuric: sulphurous and nitric acids. The catalysts may be any used conventionally in the treating of hydrocarbon oils with hydrogen, for example metal(s) with hydrogenating activity as a carrier, i.e. Ni, Co, Mo, W, V an alumina, silica on silica-alumina, or catalysts such as alumina or silica alone. These deactivated catalysts can be regenerated by removing as much of the Ni and V as is possible (if the catalyst required is to be free of these components) or by removing only enough of the Ni and V to obtain a catalyst containing desired quantities thereof. The regenerated catalyst can be used directly as such or after the addition of further amount of metals with hydrogenating activity. |
