METHOD FOR COMBINED EXTRACTION OF ARSENIC AND CHLORINE FROM OIL DISTILLATES Russian patent published in 2019 - IPC C10G45/08 B01J23/78 B01J23/85 B01J37/00 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil refining and petrochemistry, in particular, to removal of poisonous compounds for oil-refining catalysts from oil fractions, and can be used in oil refineries during oil fractions purification from impurities for further production of diesel fuel and other oil products. Method for combined extraction of arsenic and chlorine from oil distillates is carried out by hydrotreatment at temperature 360 °C and hydrogen pressure of 5 MPa in the presence of catalytically-sorption materials A and B, charged into the reactor in layers, so that a layer of catalytically-sorption material A is located under a layer of catalytic-sorption material B. Catalytic-sorption material A is obtained by adding a pre-prepared mixture of tetraethoxysilane and aluminum sec-butoxide to a solution of a template-triblock copolymer ethylene and propylene oxide – in diluted hydrochloric acid, stirring and holding at 90–100 °C to obtain a mesoporous support. Then extrudates are formed with addition of pseudo-boehmite and impregnated with solutions of ammonium heptamolybdate and nickel nitrate, taken in amount providing content in catalyst 8–14 % of molybdenum and 4–8 % of nickel in terms of oxides. Catalytically-sorption material B is obtained by adding a pre-prepared mixture of tetraethoxysilane and their sec-butoxide of aluminum to a solution of a template – a triblock copolymer of ethylene and propylene oxide – and mesitylene in diluted hydrochloric acid, stirring, adding ammonium fluoride and holding at 90–100 °C to obtain a mesoporous support. Then extrudates are formed with addition of pseudoboehmite and impregnated with solutions of magnesium acetate and nickel nitrate, taken in amount providing content in catalyst of 5–10 % of magnesium and 5–10 % of nickel in terms of oxides.

EFFECT: high degree of extraction of arsenic (to residual content of 0,038 ppm) and chlorine (to residual content <0,3 ppm) in the absence of hydrocracking of the target fraction with combined removal of arsenic and chlorine from petroleum distillates.

1 cl, 3 tbl