Process and apparatus employing a plurality of catalytic beds in series for the production of low sulphur gas oil
AssigneeInstitut Francais du Petrole
InventorsThierry Chapus, Frédéric Morel
Life of this patent
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Abstract
A process for hydrotreating gas oil comprises: a first gas oil desulfurization step carried out in a first catalytic zone comprising a desulfurization catalyst; at least partial elimination of the hydrogen sulphide formed at the end of the first gas oil desulfurization step; one or more additional desulfurization steps carried out in one or more catalytic zones comprising a desulfurization catalyst. The distribution of the catalyst in the different zones can be selected so as to maximise the catalytic activity, and thus minimize the volume of catalyst required for a unit of a given capacity operating at fixed operating temperature and pressure, so as to obtain an intensely desulfurized gas oil.
Claims23
A process for hydrodesulfurising a kerosene and/or gas oil cut to a residual content of less than 30 ppm weight comprising:
- at least one first intense hydrodesulfurization step a) in which said kerosene and/or gas oil cut and hydrogen are passed over a catalyst disposed in a fixed bed comprising on a mineral support, at least one metal or compound of a metal from group VIB of the periodic table in a quantity, expressed as the weight of the metal with respect to the weight of the finished catalyst, of about 0.5% to 40%, at least one non noble metal or compound of a non noble metal from group VIII of said periodic table in a quantity, expressed as the weight of the metal with respect to the weight of the finished catalyst, of about 0.1% to 30%, and
- b) at least one subsequent second step b) in which a gas fraction containing a portion of the resultant hydrogen sulphide contained in the total effluent from said first hydrodesulfurization step a) and an effluent that is partially depleted in hydrogen sulphide are recovered,
- c) at least one third step c) in which at least a portion of the hydrogen sulphide-partially depleted effluent from step b) and hydrogen are passed over a catalyst disposed in a fixed bed comprising, on a mineral support, at least one metal or compound of a metal from group VIB of the periodic table in a quantity, expressed as the weight of the metal with respect to the weight of the finished catalyst, of about 0.5% to 40%, at least one non noble metal or compound of a non noble metal from group VIII of said periodic table, in a quantity, expressed as the weight of the metal with respect to the weight of the finished catalyst, of about 0.1% to 30%, wherein the quantity of catalyst used in the first step is about 5% to about 40% by weight of the total quantity of catalyst used in said process and wherein the process is conducted under conditions resulting in said kerosene and/or gas oil cut having a sulfur content of less than 30 ppm while minimizing hydrogen consumption.
Dependencies are inferred from the claim text.