30results about How to "Improve nitrogen resistance" patented technology

The invention discloses a preparation method of a nitrogen-resisting hydrocracking catalyst. The preparation method comprises the following steps: 1, uniformly mixing a modified Y type molecular sieve, amorphous silicon-aluminum and/or aluminum oxide, adding dilute nitric acid, carrying out slurrying, then performing extrusion molding, and performing drying and calcination to obtain a silicon-aluminum carrier containing the modified Y type molecular sieve; and 2, performing impregnation on the carrier of the step 1 by adopting impregnation liquid containing an active metal, drying the impregnated carrier and calcining the dried carrier to obtain the hydrocracking catalyst, wherein the modified Y type molecular sieve has the following characteristics: the crystal cell constant of the modified Y type molecular sieve is 2.425-2.455nm; the bulk phase silicon-aluminum ratio is 8-30, wherein the surface layer silicon-aluminum ratio is 20-80, and the surface layer silicon-aluminum ratio is higher than the bulk phase silicon-aluminum ratio; and the specific surface area of the modified Y type molecular sieve is 600-800m<2>/g, and the pore volume is 0.40-0.70ml/g. The hydrocracking catalyst prepared by the preparation method disclosed by the invention has good reactivity and nitrogen resistance, and can be applied to different hydrocracking reaction processes such as a process for increasing the production of diesel oil, a process for increasing the production of chemical raw materials, and a process for catalyzing diesel oil hydro-conversion and the like.

The invention relates to a method for selective hydrocracking of light oil. A catalyst used in the method comprises an acidic carrier and metal oxides NiO and WO3, wherein the acidic carrier comprises two porous beta/Y composite molecular sieves and a mesoporous amorphous silicon/aluminum, and the metal oxides are loaded on the acidic carrier; the two porous beta/Y composite molecular sieves are used for ammonium exchange and organic acid pretreatment, and the two treatment methods are carried out in one process; ammonium salt used in the ammonium exchange is NH4NO3 or NH4HCO3, and the mass ratio of the beta/Y composite molecular sieves and the ammonium salt solution is (1-10):1; the solution of one or mixture of any of citric acid, tartaric acid, acetic acid, malic acid and oxalic acid is used for treatment of the beta/Y composite molecular sieves, and the concentration of the organic acid in the treatment system is 0.5-2.0 mol.L-1; the potential content of aromatic hydrocarbon in heavy naphtha in products obtained in cracking is high, and the exhaust oil has a lower BMCI (Bureau of Mines Correlation Index) value.

The invention discloses a preparation method and application of a modified Y molecular sieve. The preparation method comprises the following steps: (1) performing ammonium salt ion exchange on NaY zeolite as raw powder; (2) performing hydro-thermal treatment on the obtained Y molecular sieve; (3) treating the Y molecular sieve subjected to hydro-thermal treatment in the step (2) by using an aluminum salt solution; (4) performing rapid drying treatment on the Y molecular sieve obtained in the step (3); (5) contacting the Y molecular sieve obtained in the step (4) with unsaturated olefin and performing carbon deposit reaction; (6) performing desilicication treatment on the molecular sieve obtained in the step (5); (7) filtering and drying the Y molecular sieve obtained in the step (6) and performing carbon burning treatment to obtain the modified Y molecular sieve. According to the method, the outer surface of the Y molecular sieve is selectively subjected to dealumination and silicon reinsertion, so the ratio of silicon to aluminum on the outer surface of the Y molecular sieve is increased, and a hydrocracking catalyst prepared with the Y molecular sieve has high reaction activity and nitrogen resistance.

The invention relates to a light cycle oil hydrocracking catalyst and a preparation method thereof. The problems of low light cycle oil cracking activity and poor nitrogen resistance of traditional hydrocracking catalysts are mainly solved in the invention. The catalyst comprises, by weight, 15-35% of at least one of FAU zeolite, BEA zeolite and MFI zeolite, 5-16% of amorphous silica-alumina, 10-20% of pseudo-boehmite, 5-10% of molybdenum sulfide, 9-16% of tungsten sulfide and 3-6% of at least one active component selected from nickel phosphate and cobalt phosphate. The light cycle oil hydrocracking catalyst adopting the above technical scheme well solves the problems, has the advantages of no precurng, high cracking activity, high nitrogen resistance, and flexible and controllable product distribution, and can be used in the field of hydrogenation refining and chemical engineering.

The invention relates to a catalytic cracking method for a high nitrogen raw material. The method comprises: feeding a high nitrogen raw material into a catalytic cracking reactor, making the high nitrogen raw material contact a catalytic cracking catalyst, and carrying out a catalytic cracking reaction to obtain a reaction product and a spent catalyst; and carrying out charring regeneration on the spent catalyst to obtain a regenerated catalyst, and feeding the obtained regenerated catalyst as the catalytic cracking catalyst into the catalytic cracking reactor, wherein the catalytic crackingcatalyst comprises a boron-modified phosphorus-containing Y molecular sieve, a heat-resistant inorganic oxide and optionally clay. With the method of the present invention, the conversion rate of thehigh nitrogen raw material can be improved, and the product distribution can be optimized.

The invention discloses a preparation method and application of a modified Y molecular sieve and a single-stage hydrocracking catalyst. The method comprises the following contents: (1) carrying out ammonium salt ion exchange on NaY zeolite as a raw material; (2) carrying out isomorphous substitution treatment on the Y molecular sieve in the step (1); (3) carrying out hydro-thermal treatment on the Y molecular sieve treated in the step (2); (4) carrying out acid dealumination treatment on the Y molecular sieve treated in the step (3); (5) carrying out fast drying treatment on the Y molecular sieve treated in the step (4); (6) carrying out carbon deposit reaction on the Y molecular sieve obtained in the step (5); (7) carrying out desilicication treatment on the molecular sieve obtained in the step (6); and (8) filtering and drying the Y molecular sieve subjected to desilicication treatment in the step (7) and carrying out charking treatment to obtain a modified Y molecular sieve. The single-stage hydrocracking catalyst prepared from the modified Y molecular sieve prepared through the method is applied to a single-stage hydrocracking process and has good reaction activity and nitrogen resistance.