초록 ▼

The invention concerns a process for the elimination of mercury from hydrocarbons by passage of the feedstock with hydrogen over a catalyst then bringing the product obtained into contact with a mercury retention bed, the catalyst comprising at least one element selected from the group constituted b

The invention concerns a process for the elimination of mercury from hydrocarbons by passage of the feedstock with hydrogen over a catalyst then bringing the product obtained into contact with a mercury retention bed, the catalyst comprising at least one element selected from the group constituted by iron, nickel, cobalt, molybdenum, tungsten, palladium, wherein at least 5% is in the sulphide state. Any arsenic present in the feedstock is also eliminated. In accordance with the invention, the catalyst is simultaneously presulphurated and reduced. The invention results in a considerable reduction in operation period and high retention efficiency at temperatures between 120°C. and 250°C. and in the presence of 0-1000 mg of sulphur/kg of feed.

대표청구항 ▼

In a process for the elimination of mercury from a hydrocarbon feedstock comprising mercury compounds and from 0 to 1000 mg of sulphur/kg, wherein the feedstock, in the presence of hydrogen, is brought in a first step into contact with a catalyst consisting essentially of at least one metal componen

In a process for the elimination of mercury from a hydrocarbon feedstock comprising mercury compounds and from 0 to 1000 mg of sulphur/kg, wherein the feedstock, in the presence of hydrogen, is brought in a first step into contact with a catalyst consisting essentially of at least one metal component and a support, the resultant treated feedstock then being brought in a second step into contact with a mercury retention bed comprising sulphur or a metallic sulphide, the improvement wherein the metal component of the catalyst consists essentially of at least one presulfurized metal selected from the group consisting of iron, nickel, cobalt, molybdenum, tungsten, chromium and palladium, at least 5% and at most 50% by weight of said metal or metals being in the form of its sulphide, and wherein said catalyst is obtained in a first step by impregnation of a catalyst precursor comprising said supported metal or metals in the metallic and/or oxide form, using an aqueous or organic solution or an aqueous or organic suspension comprising a reducing agent and at least one sulphur containing agent selected from the group consisting of (a) at least one organic polysulphide mixed with elemental sulphur, (b) at least one organic disulphide optionally mixed with elemental sulphur, (c) at least one organic or inorganic sulphide optionally mixed with elemental sulphur, and (d) elemental sulphur, said impregnated precursor then being thermally treated in a second step, and wherein the contact with the catalyst takes place at a temperature of 120°C. to 250°C. and a pressure of 1 to 40 bars, and that the contact with the retention bed takes place at a temperature of less than 220°C. and at a volumetric flow of 1 to 50 h-1.