Patent RU-2676086-C1 (RU)
Inventor: ANDREEV OLEG PETROVICH
IPC: B01J21/00
Filed: 2018-03-19
Granted: 2018-12-26
Abstract: FIELD: technological processes.SUBSTANCE: invention relates to the field of catalytic synthesis of gasoline fractions from synthesis gas and processes for the conversion of hydrocarbons in a synthesis gas medium, in particular, to methods of preparing a universal bifunctional catalyst (BFC) for the above-mentioned processes, and can be used in the petrochemical and gas processing industries. Method is described for preparing a universal bifunctional catalyst for the conversion of synthesis gas and hydrocarbons into gasoline fractions, including separate grinding of the components of a metal oxide catalyst for methanol synthesis, namely, zinc and chromium oxides or zinc, chromium and aluminum oxides with an atomic ratio of Zn/Cr of less than 4, and zeolite component with a molar ratio of SiO/AlOmore than 12, having micropores with a size of more than 0.5 nm, mixing ground components of a metal oxide catalyst for methanol synthesis and a zeolite component to obtain a homogeneous mixture, adding to the mixture of aluminum oxide as a binder component, granulating the resulting mixture by extrusion, drying the extrudates made in air, crushing the extrudates to form granules of the catalytic composition and calcining the latter, the recovered metal oxide catalyst for methanol synthesis with the content of oxides of sodium and iron less than 0.04 wt.% each, having a 100 % degree of recovery and has not been exposed to temperatures of more than 400 °C in an airy, reducing or inert environment, and an acid component with a sodium oxide content of less than 0.04 wt.%, selected from a number of zeolites with the structure of ZSM-5, ZSM-12, Beta, having a molar ratio of SiO/AlOmore than 25, or from a series of crystalline silico-aluminophosphates with a SAPO-5 structure, or a combination of SAPO-5 with a zeolite of the ZSM-5 type, grind them to a particle size of less than 0.3 mm, add an active hydrogel of aluminum oxide or amorphous aluminum hydroxide and, if necessary, chemically purified water with pH of 6.5–7.5 is added to the resulting homogeneous mixture as a binder component, in the reduced metal oxide catalyst for methanol synthesis, in the acid and in the binder components, there are no water-soluble metal cations and anions of inorganic and organic acids, and the pH of the components of a bifunctional catalyst is in the range of 6.5–7.5, then the pasty mass obtained by mixing particles of the reduced metal oxide catalyst for methanol synthesis, acid and binder components at a temperature of 20–60 °C, is at least twice passed through a device for grinding materials, in which the cutting unit consists of a rotating figure knife, interacting with a fixed grid with through axial channels, and then subjected to a screw or piston extrusion at a temperature of 20–60 °C, and the drying of the extrudates obtained is carried out in two stages: first, at room temperature for at least 24 hours, and then at 120 °C for at least 4 hours, the granules formed as a result of crushing the dried extrudates should have a cylindrical shape with a diameter of 3–5 and a length of 8–12 mm, and calcining the manufactured granules is carried out after they are loaded into the synthesis gas conversion reactor with a fixed catalyst bed: initially – at a temperature of 200–320 °C in a nitrogen atmosphere, and then at a temperature of 320–400 °C in the environment of circulating synthesis gas, the multiplicity of the circulation of synthesis gas must be at least 10.EFFECT: creating a method for preparing a durable and active universal BFC for the processes of converting synthesis gas and hydrocarbons into gasoline fractions with a moderate content (15–35 wt.%) of aromatic hydrocarbons, having a high selectivity of action – at least 75 wt.% of hydrocarbons C.6 cl, 18 ex, 3 tbl, 1 dwg