30results about How to "High oil selectivity" patented technology

The invention relates to a hydrocracking catalyst with high activity and high-medium oil selectivity. According to the hydrocracking catalyst, amorphous silicon aluminum is used as a carrier, and a specially-modified Y-type molecular sieve is used as acid component, the molecular sieve has high degree of crystallization and low cell parameters, rich secondary holes, large surface area, less uniformly-distributed acid sites, no strong acid center, and most of medium-strength acid centers, and also has strong nitrogen-resisting performance and better damage capacity; and the hydrocracking catalyst using the molecular sieve has high hydrocracking activity and high middle oil selectivity, and stronger nitrogen resisting capacity. The catalyst provided by the invention is used in the process of producing an intermediate distillate product by adopting a heavy hydrocarbon single-section or one-section hydrocracking process, and has better activity and middle oil selectivity.

The invention discloses a preparation method of a hydrocracking catalyst. The method comprises the steps of preparing an acidic mixed solution A containing hydrogenation reactive metals and silicon, preparing a sodium metaaluminate alkaline solution B, and then adding the acidic mixed solution A, the alkaline solution B and CO2 to a reaction tank filled with clear water in parallel to prepare gel; and then adding turbid liquid of a Y type molecular sieve, mixing the substances uniformly, filtering, drying and forming the mixture, and then washing, drying and roasting the product, thus preparing the hydrocracking catalyst. 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 catalyst prepared by the method can be used for a single-section hydrocracking process of a non-refining section or a one-section serial hydrocracking process of a refining section.

The invention relates to a composite mesoporous molecular sieve hydrocracking catalyst and the application thereof. The catalyst composed of following components of 20 to 50 percent of amorphous silica-alumina, 5 to 30 percent of alumina, 10 to 25 percent of adhesives, 10 to 40 percent of Group VIB-the metal oxides, 1 to 20 percent of Group VIII-the metal oxides, 0.1 to 10 percent of Group VA-the metal oxides, and 1 to 40 percent of composite mesoporous molecular sieve, wherein, the composite mesoporous molecular sieve is a composite molecular sieve composed of a mesoporous molecular sieve AlSBA-15 and/or AlSBA-15/Y; the weight ratio of the composite molecular sieve AlSBA-15/Y in the AlSBA-15 and a Y molecular sieve is 9:1 to 1:9; the weight ratio of the mesoporous molecular sieve and a pore molecular sieve is 3:1 to 1:3, the silica alumina ratio is 10:1 to 40:1, and the silica alumina ratio of the Y molecular sieve is 5:1to 20 :1. The catalyst used for hydrocracking for heavy oil shows high activity for hydrocracking and high medium oil selectivity.

The invention discloses a preparation method of a hydrocracking catalyst. According to the method, a nickel and aluminum precipitate is prepared with a straight addition method; a tungsten, silicon and aluminum precipitate is prepared with a parallel flow precipitation method; the two precipitates are mixed, and a suspension liquid of Y type molecular sieve is added, such that the catalyst is prepared. With the method, the distributions of different hydrogenation active metals can be controlled; high-activity phase can be formed among active metals tungsten and nickel; and the interaction between active metals and the carrier can be improved. Therefore, the hydrogenation activity and the cracking activity of the obtained hydrocracking catalyst can cooperate well, and the application performance of the hydrocracking catalyst can be improved.

The invention relates to a Y/Beta composite dual-microporous material. A composite molecular-sieve material has the structure that a Y molecular-sieve is taken as a kernel, a Beta molecular-sieve is taken as a shell, the two molecular-sieves are closely combined into a composite molecular-sieve particle, the Beta molecular-sieve wraps the Y molecular-sieve, and the content of the Y molecular-sieve is 30 to 70 percent in a composite molecular-sieve. The synthesis method of the composite molecular-sieve adopts a one-step crystallization method and utilizes a liquid concentration principle to lead a template agent and amorphous Si and Al in the Y molecular-sieve to form a secondary structure unit of the Beta molecular-sieve and even a Beta molecular-sieve seed crystal; then the Beta molecular-sieve grows through the guiding effect of the seed crystal. The Y/Beta composite dual-microporous material which is synthesized by adopting the method has the high composite advantage; the Beta molecular-sieve wraps the surface of the Y molecular-sieve, and the Beta molecular-sieve in the composite dual-microporous material is in the nano-scale, so the catalytic performance of the whole composite dual-microporous material is enhanced markedly; and the medium oil selectivity of the hydrocracking reaction can be increased, and the reaction temperature is reduced.

The invention relates to a preparation method of a high-medium oil selective hydrocracking catalyst. The invention firstly provides a preparation method of a Y-molecular sieve/ Si-Al oxide composite catalytic material, comprising the steps of: synthesizing a Y-molecular sieve by a guide agent method, controlling the synthesis temperature of mother solution to be below 0 DEG C, the ageing time to be 4-8h, the crystallization temperature to be 90-95 DEG C and the crystallization time to be 9-18h, and obtaining slurry formed by the Y-molecular sieve and the rest crystallization liquid; carrying out ammonium exchange treatment on the Y-molecular sieve, and obtaining the mixed solution; and adding an Al source and a Si source into the mixed solution, adjusting the pH value to be 6-10 to form gel, drying the gel, and obtaining the composite catalytic material. The invention also provides the preparation method of the high-medium oil selective hydrocracking catalyst, comprising the following steps of: preparing the Y-molecular sieve/Si-Al oxide composite catalytic material according to the method; taking the composite catalytic material as a carrier for carrying active components; and obtaining the high-medium oil selective hydrocracking catalyst by drying and calcining.

The invention discloses a preparation method for a hydrocracking catalyst containing heteropoly acid. The method comprises the following steps: preparing a nickel-aluminum precipitate with larger grain by using a regular addition method; preparing a tungsten-silicon-aluminum precipitate with smaller grain by using a parallel flow method; mixing the two precipitates and carrying out hydrothermal treatment; then carrying out impregnation with a heteropoly acid solution; and carrying out molding and calcination so as to prepare the hydrocracking catalyst. The method enables the catalyst to have high using performance by adjusting distribution of a hydrogenation active metal, heteropoly acid, alumina and amorphous silicon aluminum and promoting coordination and cooperation among the above-mentioned substances.