Catalytic multi-stage hydrodesulfurization of metals-containing

Details Catalytic multi-stage hydrodesulfurization of metals-containing Catalytic multi-stage hydrodesulfurization of metals-containing

1997-05-09

1999-07-20

Myers, Helane

Mineral oils: processes and products

Refining

Sulfur removal

208216R, 208251H, 208213, C10G 6504

Patent

active

059252383

ABSTRACT:
A process for catalytic two-stage hydrodesulfurization of metal-containing petroleum residua feedstocks to achieve at least about 75% desulfurization of the liquid product while also providing at least about 40% reduction in catalyst consumption. In the process, used catalyst having a catalyst equilibrium age of 0.3-5.0 bbl oil feed/lb catalyst is withdrawn from the second stage reactor, rejuvenated so as to remove 10-50 wt. % of the contaminant metals and at least 80 wt. % of carbon deposited on the catalyst, and then cascaded forward and added to the first stage reactor. Sufficient fresh make-up catalyst is added to the second stage reactor to replace the used catalyst withdrawn there, and only sufficient fresh catalyst is added to the first stage reactor to replace any catalyst transfer losses. Used catalyst having a catalyst equilibrium age of 0.6 to 10.0 bbl. oil per lb. catalyst is withdrawn from the first stage reactor for discard.

REFERENCES:
patent: 3705844 (1972-12-01), Alpert
patent: 3795607 (1974-03-01), Adams et al.
patent: 3900390 (1975-08-01), Adams
patent: 3926784 (1975-12-01), Christman et al.
patent: 3964995 (1976-06-01), Wolke et al.

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