Hydrotreating catalysts

Details Hydrotreating catalysts Hydrotreating catalysts

1986-10-31

1988-12-06

Dees, Carl F.

Catalyst, solid sorbent, or support therefor: product or process

Zeolite or clay, including gallium analogs

And additional al or si containing component

502 74, B01J 2910

Patent

active

047896540

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

The present invention relates to a catalyst used suitably for hydrotreating heavy hydrocarbon oils. In more detail, the present invention relates to a hydrotreating catalyst that is capable of exhibiting a superior activity in the hydrodesulfurization of heavy oils represented by atomospheric residue and vacuum residue and further increasing the yield of an middle distillate such as kerosene and light gas oil.


BACKGROUND ART

Recently, as crude oils become more heavy, the art of desulfurization, demetalization and denitrification of heavy oils that contain asphaltene, resin and the like and further contain large amounts of organic metal compounds such as vanadium, nickel and the like, by contacting the heavy oil with a catalyst under hydrogen pressure is increasing in importance more and more. On the other hand, as the demand for petroleum fractions varies, there is a tendency that middle distillates are in short supply. Because of this, there is rising the demand that on hydrotreating heavy oils, desulfurization, demetalization and denitrification should be conducted while suppressing the by-production of light fractions as much as possible and obtaining the middle distillates such as kerosene and light gas oil in a high yield.
In the hydrotreating process of heavy oils, there is generally used a catalyst comprising metal components selected from Group VIA and/or Group VIII of the Periodic Table as hydrogenating active components supported on a carrier, said carrier consisting of an alumina-containing inorganic oxide and a zeolite. The desulfurization activity of the catalyst of this sort used for hydrotreatment of heavy oils generally depends upon the quantities of alumina-containing inorganic oxides, and the yield of middle distillate generally depends upon the quantity of said zeolite. Accordingly, the fact is that in conventional hydrotreating catalysts, the desulfurization activity and the yield of middle distillate are in a contradictive relation, for instance when a catalyst of high desulfurization activity is used, it is impossible to expect the high level yield of middle distillate.
As described above, in the light of the demand of the industry and the problems inherent in the conventional art, the inventors have devoted themselves to various investigations to develop a catalyst that can bring about good results not only in the point of desulfurization activity but also in the point of yield of middle distillate and found that a catalyst comprising a hydrogenating active component supported on a catalyst carrier consisting a precursor of an alumina-containing inorganic oxide and a specified zeolite as referred to afterwards can satisfy the object.


DISCLOSURE OF INVENTION

The hydrotreating catalyst according to the present invention is one that comprises a hydrogenating active component on a carrier consisting of an alumina-containing inorganic oxide and a zeolite, wherein a carrier is prepared by mixing a precursor of an alumina-containing inorganic oxide and a faujasite type Y Zeolite having the following particle size distribution, forming this mixture into a particle having desired shape and dimensions, and then drying and calcining this particle, and said catalyst is such that metal components selected from Group VIA and Group VIII of the Periodic Table are carried on the thus prepared carrier.
Particle size distribution


______________________________________ Particle diameter 3.mu. or less 20 wt. % or less Particle diameter 3-12.mu. 50-70 wt. % Particle diameter 12-30.mu. 10-40 wt. % ______________________________________


BRIEF EXPLANATION OF DRAWING

FIG. 1 shows the integral pore size distribution curves of catalysts A, B, C, D and E according to the present invention and comparative catalysts of F, G and H.
FIG. 2 is a graph showing the reaction results obtained by using catalysts A, B, C, D, E, F, G and H for hydrotreating atomospheric residue respectively.


BEST MODE OF CARRYING OUT THE INVENTION

As the alumina-containing inorganic oxides

REFERENCES:
patent: 3574092 (1971-04-01), Mitsche
patent: 4120825 (1978-10-01), Ward
patent: 4134856 (1979-01-01), Itoh et al.
patent: 4515903 (1985-05-01), Otterstedt et al.
patent: 4546090 (1985-10-01), Olson et al.

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