33results about How to "Improved acid distribution" patented technology

The invention discloses a hydrocracking catalyst for producing heavy naphtha in great abundance and a preparation method thereof. The catalyst contains hydrogenation active metals and a carrier which consists of modified Y molecular sieves and alumina, wherein the Y molecular sieves are obtained by using a mixed aqueous solution of aluminum salts and an acid to perform hydro-thermal treatment. The properties of the modified Y molecular sieves are as follows: the specific surface area is between 750 m<2>/g and 850 m<2>/g; the total pore volume is between 0.35 and 0.48 ml/g; the relative crystallinity is between 90 and 130 percent; the cell parameter is between 2.437 and 2.445 nanometers; the silicon-aluminum mol ratio is between 15 and 70; the infrared acid amount is between 0.5 and 1.0 mmol/g; the B acid/L acid is more than 7.0; and the content of sodium oxide is less than or equal to 0.05 weight percent. The hydrocracking catalyst has the characteristics of good catalytic activity, high heavy naphtha selectivity, high yield, high latent content of heavy naphtha arene, and so on.

The invention discloses a hydrocracking catalyst carrier and a preparation method thereof. The catalyst carrier comprises a modified Y-type molecular sieve, amorphous silica-alumina and alumina, wherein the modified Y-type molecular sieve is Y-type molecular sieve treated by mixed aqueous solution of an aluminum salt and an acid and by hydrothermal process. In the carrier, the modified Y-type molecular sieve has a high crystallinity, high silicon to aluminum ratio and proper total acidity and acid distribution and can form an acid component with the amorphous silica-alumina. Therefore, the carrier is particularly suitable for serving as a hydrocracking catalyst carrier to improve the activity of a hydrocracking catalyst and the selectivity of middle distillates.

The invention discloses a hydrogenation catalyst and a preparation method thereof. The catalyst comprises hydrogenation active metal components and a carrier consisting of the small crystal grain Y-shaped molecular sieve, amorphous silica-alumina and aluminum oxide, wherein the small crystal grain Y-shaped molecular sieve is a small crystal grain Y-shaped molecular sieve subjected to hydro-thermal treatment. The hydrocracking catalyst provided by the invention has the characteristics of high catalyst activity, excellent target product selectivity, great preparation flexibility, and the like, thus the catalyst can be used for preparing products such as heavy naphtha, aviation kerosene, diesel oil and the like with high yield and good product quality.

The invention relates to a modification method for a USY molecular sieve and in particular relates to a combined modification method for a mesopore USY molecular sieve. The combined modification method for the mesopore USY molecular sieve comprises that raw materials such as a USY material, an organic acid solution and an inorganic salt solution are measured in ratio, stirring in a closed reactor is carried out, temperature is increased to 90 DEG C, an organic acid-inorganic salt combined dealumination reaction is carried out for 8 hours; reactants are washed at room temperature, and suction filtration is carried out until the surface of USY is neutral; and drying is carried out at constant temperature of 110 DEG C for 16 hours, so that the USY molecular sieve product is obtained. The combined modification method for the mesopore USY molecular sieve has the advantages that a mixed aqueous solution of organic acid and inorganic salt is adopted for treating the USY type molecular sieve, so that high crystallinity of the molecular sieve can be maintained, silica-alumina ratio of the molecular sieve is increased, lattice constant is reduced, specific surface of the molecular sieve is increased, and acidity and acid distribution of the molecular sieve are improved; and more secondary holes are formed through dealumination, so that components with larger molecular diameter can easily enter into pore passages of the molecular sieve or get close to the surface of the molecular sieve, and conversion efficiency of hydrogen cracking can be improved.

A modification method for a Y-type molecular sieve includes the steps of: a) adding water to NaY molecular sieve to pulp the molecular sieve, and adding polyhydroxy alcohol to the molecular sieve according to the alcohol-to-sieve ratio of 1-20:1, and treating the mixture at 80-200 DEG C to prepare slurry A; b) mixing the slurry A with organic alkali to prepare slurry B according to the alkali-to-sieve ratio of 0.1-1:1, and successively adding an aluminum source and a silicon source and aging the mixture to obtain slurry C, wherein the mass ratio of the aluminum source, on the basis of Al2O3, to the NaY molecular sieve is 0.1-1:1, the mass ratio of the silicon source, on the basis of SiO2, to the aluminum source, on the basis of Al2O3, is 0.1-0.5:1, and the silicon source is added after the aluminum source is fully and uniformly mixed with the slurry B; and c) performing hydrothermal crystallization to the slurry C in a sealed reaction kettle and collecting a product. The method can increase the silicon-aluminum ratio of framework of the molecular sieve and improve distribution of acidity, and meanwhile, ensures that the molecular sieve has better hydrothermal structural stability and excellent heavy oil conversion performance.

The invention provides a treating method for improving the stability of a Y-type molecular sieve. The method comprises the following steps: mixing a NaY molecular sieve with polyhydroxy alcohol according to an alcohol-sieve mass ratio of (1-20): 1 and carrying out treatment at 80 to 200 DEG C; then uniformly mixing the NaY molecular sieve with organic base according to a base-sieve mass ratio of (0.1-1): 1; adding an aluminum source and inorganic base and controlling the pH value of system to be 8 to 11; then adding a silicon source and carrying out aging; and subjecting aged slurry to crystallization and recovering a product; wherein a mass ratio of the aluminum source, in terms of Al2O3, to the molecular sieve is (0.1-1): 1, and a mass ratio of the silicon source, in terms of SiO2, to the molecular sieve is (0.1-1): 1. The method can effectively improve the hydro-thermal structural stability and hydro-thermal activity stability of the molecular sieve.

The invention discloses a method for preparing a catalyst for catalyzing diesel hydrocracking. The method comprises the following steps: (1) roasting a hydrocracking catalyst inactivated in a diesel hydro-conversion catalyzing process in an oxygen-containing atmosphere until a decarburization rate is 40-80% so as to obtain a decarburization catalyst; (2) grinding the decarburization catalyst obtained in the step (1) so as to obtain decarburization catalyst powder, and screening the powder for later use; (3) mixing the screened powder obtained in the step (2), a hydrocracking catalyst carrier material and a hydrogenation activity metal precursor, adding dilute nitric acid solution and sesbania powder, rolling, extruding, performing high-temperature treatment in an inert atmosphere, so as to obtain the catalyst for catalyzing diesel hydrocracking. The catalyst prepared by the invention has reasonable acid strength distribution characteristics and good active metal dispersion and is applied to the diesel hydro-conversion catalyzing process, so that the initial activity stabilization time of the device catalyst is shortened, the on-stream time is shortened, the catalyst inactivation rate is reduced, and the catalyst running period is prolonged.

The invention discloses a hydrocracking catalyst as well as a preparation method and the application thereof. The hydrocracking catalyst comprises a carrier, active ingredients and aids, wherein the carrier comprises the following components in percentage by weight: 2-30% of a Y molecular sieve, 2-30% of a beta molecular sieve, 50-70% of porous alumina and 1-12% of modified clay. The hydrocrackingcatalyst disclosed by the invention is applied to high temperature coal tar hydrogenation for preparing diesel components, and has the advantages of high selectivity, high activity, high stability, high light oil yield, high diesel yield, excellent quality and the like.

The invention discloses a preparation method of a multi-metal modified composite material. The method comprises a process of modifying a porous material by rare earth and magnesium. The porous material has two structures which are an FAU crystalline phase structure and a pseudo-boehmite amorphous phase structure at the same time, ordered diffraction stripes of an FAU crystal part and a disorderedstructure of a pseudo-boehmite part exist, and the disordered structure is derived and grown along the edges of the ordered diffraction stripes, and the two structures are effectively combined together to form a microporous-mesoporous composite structure; a/b of a Raman spectrum is equal to 1.5-10, and probable pore distribution occurs at the wavelength of 3-4nm, 8-20nm and 18-40nm. The compositematerial prepared by the method contains microporous and mesoporous structures at the same time, the acid distribution is further improved through the modification effect of rare earth and magnesium,and the reaction performance is promoted.

The invention discloses a preparation method of a hydrocracking catalyst composition. The method comprises the steps of preparing an acidic mixed solution A containing hydrogenation reactive metals and silicon and filling CO2 into the solution A; and preparing a sodium metaaluminate alkaline solution B, subjecting the solution B to react with the solution A into which CO2 is filled to prepare gel, then adding turbid liquid of a Y type molecular sieve, mixing the substances uniformly, filtering the obtained mixture, drying the obtained filter cake, and then forming, washing, drying and roasting the filter cake, thus preparing the hydrocracking catalyst composition. The method has the beneficial effects that a clean preparation method is adopted, so not only can the catalyst be easily formed and the strength of the catalyst be improved, but also the pore volume and specific surface area of the catalyst can be increased and the dispersity of metals in the catalyst can be improved, thus the catalyst has higher hydrocracking activity, middle oil selectivity and stability; and the hydrocracking catalyst composition prepared by the method is especially suitable for producing more high-quality naphtha, jet fuel and diesel.

The invention relates to a benzene and synthesis gas alkylation catalyst and a preparation method and application thereof. The catalyst carrier adopts two composite molecular sieves, optimizes the pore structure and acid distribution of the catalyst, has the advantages of high catalytic activity and good selectivity, and adopts macroporous alumina as a binder to increase the specific surface area and pore volume of the catalyst, improve the mass transfer and heat transfer effects of the catalyst, and improve the catalytic activity of the catalyst. The conversion rate of benzene and the selectivity and yield of methylbenzene and C8 aromatic hydrocarbon are improved, and the preparation method is simple, sufficient in raw material source, low in cost, easy to operate and suitable for large-scale industrial application.