31results about How to "Small cell constant" patented technology

The invention relates to a method for modifying a USY (Ultra-Stable Y) molecular sieve. The method is characterized in that organic acid and an inorganic salt dealuminizing reagent are simultaneously added in a modifying process for organic acid-inorganic salt combined modification, and optimum process conditions, namely optimum concentration, volume ratio, reaction time, reaction temperature and the like, of an organic acid and an inorganic salt solution are determined by virtue of an orthogonal test. Compared with an industrial USY molecular sieve, the USY molecular sieve obtained by adopting the method disclosed by the invention is obviously increased in secondary pore content, can be kept at higher crystallinity and is enhanced in silica-alumina ratio, reduced in lattice constant and suitable for high-medium oil type hydrocracking catalyst carriers.

The invention relates to a modifying method for Y molecular sieve, which comprises: using industrial NaY molecular sieve as material for ammonium exchange, baking deeply; then, adding surfactant during dealumination with acid. This invention obtains HY molecular sieve with high SiO2/Al2O3(9~15) and crystallinity, improves secondary pores and acid structure compared with the industrial NaY, and fits to be carrier for hydrotreating catalyst for heavy distilled oil.

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.

This invention discloses a hydrocracking method, and this invention is used for producing high aromatic hydrocarbon heavy naphtha and high quality end oil.It includes that heavy distillate oil and poor quality catalytic cracking diesel hydrocracks separately, and the mixture of the cracking products is conducted gas liquid separation. Light naphtha, heavy naphtha, aviation kerosene, diesel oil and end oil will be obtained by distillating the liquid phase. The density of the poor quality catalytic cracking diesel oil is above 0.9g/ml, and the aromatic hydrocarbon is over 60wt% and the value of hexadecane is under 30. It is a adequate utilization of catalytic cracking craft to produce high aromatic hydrocarbon heavy naphtha and high quality end oil with heavy distillate oil and poor quality catalytic cracking diesel, which can be separately used as catalytic reforming material and making ethylene material by steam cracking method. High aromatic hydrocarbon heavy naphtha in this invention will produce a large amount of reforming hydrogen after catalytic reforming treatment, which can be used in the process of hydrocracking to make this preparation more ecnomical and reasonable.

The invention discloses a catalyst for straight-run naphtha aromatization and a preparation method thereof. The catalyst for straight-run naphtha aromatization is prepared by modifying a nano ZSM-5 molecular sieve, preparing a carrier and preparing the catalyst. The catalyst is suitable for treating raw materials with high alkane content. And the catalyst has high catalytic activity and high arene selectivity. So the catalyst can be applied to more mild process conditions and can be applied to production of high-octane gasoline blending components and chemical raw materials like benzene, toluene, xylene, etc.

The invention discloses a preparing method of deep aluminium-stripping Y-zeolite, which comprises the following steps: adopting NH4NaY with the content of Na2O not more than 2.5w%; proceeding first water heat disposal; utilizing high-density H+ ammonium salt solution to exchange to strip aluminium; proceeding second water heat disposal; removing non-frame aluminium through acid solution; setting the disposing temperature of second water heat disposal higher than the first one; improving crystallinity and silicon-aluminium rate with abundant secondary hole.

The invention relates to a composite molecular sieve-containing medium oil type hydrocracking catalyst, which comprises an active component and a binder, wherein the active component adopts amorphous SiO2-Al2O3 as a carrier, adopts a composite molecular sieve as an acid component, and adopts a group VIB metal and a group VIII metal as hydrogenation activity components, and the composite molecular sieve comprises a Y molecular sieve and a ZSM-23 molecular sieve. According to the present invention, the deep dealuminzation modified Y molecular sieve has characteristics of high crystallinity, large surface area, high silica-alumina ratio, low cell constant, rich secondary pore, low acid center density, high moderate-intensity acid center ratio, and the like; the modified ZSM-23 molecular sieve has characteristics of smooth pore channel, less acid center and outstanding isomerism performance, wherein a light naphtha component is isomerized so as to increase an octane number of naphtha; the composite molecular sieve compounded from the Y molecular sieve and the ZSM-23 molecular sieve is adopted as the acid cracking component so as to provide advantages of the Y molecular sieve and the ZSM-23 molecular sieve, and compounding is performed according to the ratio of the present invention, such that the best catalysis effect can be obtained, and the obtained catalyst is suitable for the medium oil type hydrocracking catalyst; and the catalyst prepared from the composite molecular sieve has characteristics of excellent medium oil selectivity, good activity and good stability.

The invention discloses a hydrocracking catalyst carrier and a preparation method of the hydrocracking catalyst carrier. The hydrocracking catalyst carrier is prepared by using modified Y zeolite, aluminum oxide and amorphous silicon-aluminum. The modified Y zeolite has the following physiochemical properties: the mole ratio of SiO2 to Al2O3 is 30-120; the lattice constant is 2.420-2.435nm; the relative crystallinity is more than or equal to 90%; the specific surface area is 750-850m<2>/g; the secondary pore with 1.7-10nm accounts for more than 50% of the total pore volume; the infrared acidity is 0.10-0.50mmol/g; the ion exchange capacity is less than or equal to 0.10%; and the water adsorption quantity is less than 5.0% in percentage by weight at 25 DEG C and P/P0 of 1.0. The preparation method of the catalyst carrier provided by the invention comprises the following steps: mechanically mixing the modified Y zeolite, aluminum oxide, amorphous silicon-aluminum and adhesive, grinding, extrusion-moulding, drying and calcining to obtain the catalyst carrier. The catalyst carrier prepared by using the modified (deeply dealuminated) Y zeolite as the acidic cracking component is suitable to be used as the hydrocracking catalyst for middle distillates oil.

The invention discloses an ultra-stabilization treatment method of a high-rare-earth-content in-situ crystallization catalyst. The ultra-stabilization treatment method includes that the ultra-stabilization catalyst high in rare earth content and lower than 2.455nm in lattice constant is prepared by high-temperature hydrothermal calcining of NaY-type catalyst for in-situ crystallization under different temperature gradient conditions after multiple times of exchange of ammonium ions and rare earth ions. The high-rare-earth-content in-situ crystallization catalyst has the advantages of high rare earth content, high silicon-aluminum ratio, high activity, high stability and excellent coke selectivity.

The present invention discloses a catalytic diesel fuel reaction distillation method. According to the method, equipment mainly comprises a reaction distillation tower and a hydrogen circulation system, the stripping section of the reaction distillation tower adopts a hydrocracking catalyst as a filler, the rectification section is provided with the rectification tower plate, the tower plate can be provided with an isomerization catalyst, one part of the tower bottom oil is circulated to the material inlet of the tower, the remaining part is discharged out from the equipment and is adopted as the product, a hydrogen circulation heating furnace is arranged, the heated hydrogen gas enters the bottom of the tower, and the gasoline distillate is obtained from the top of the tower. With the method, the characteristics of the hydrocracking and the reaction distillation process are completely utilized so as to reduce the secondary reaction of the light distillates and improve the hydrogenation reaction speed of the gasoline distillate. According to the present invention, the poor-quality cracking diesel fuel is adopted as the raw material to produce the high octane number naphtha and the high-quality diesel fuel, such that the obtained products can respectively be adopted as the blending component of the high octane number naphtha and the blending component of the high-quality diesel fuel; and compared with the conventional hydrogenation process, the method of the present invention has characteristics of simple process and energy saving.

The invention provides a modification method of a faujasite molecular sieve, the obtained modified faujasite molecular sieve and application, the method comprises the following steps: the faujasite molecular sieve and gaseous silicon tetrachloride are subjected to a contact reaction, the contact reaction time is not more than 5 seconds, and the modified faujasite molecular sieve is obtained. The space of the contact reaction is more than two times of the bulk volume of the faujasite molecular sieve in the reaction area, and the temperature of the contact reaction is 250-600 DEG C. The relative crystallization retention degree of the obtained modified zeolite molecular sieve is not less than 85%, the unit cell constant is lower than 24.55 angstroms, and a catalytic cracking catalyst prepared from the modified faujasite molecular sieve has high gasoline yield and total light oil yield when used for catalytic cracking of heavy oil.

The invention discloses a catalytic cracking catalyst as well as preparation and application thereof. The catalyst contains a modified Y-type molecular sieve, an aluminum oxide binder and clay; according to the modified Y-type molecular sieve, the content of magnesium oxide in the modified Y-type molecular sieve is 0.5-4.5 wt%; the content of sodium oxide is 0.1 wt%-0.5 wt%; the total pore volumeis 0.33 mL/g to 0.39 mL/g; the pore volume of secondary pores with the pore diameter of 2nm-100nm of the modified Y-type molecular sieve accounts for 10%-25% of the total pore volume, the lattice constant is 2.440 to 2.455nm, the content of non-skeleton aluminum in the modified Y-type molecular sieve is not higher than 20% of the total aluminum content, the lattice collapse temperature is not lower than 1040 DEG C, and the ratio of the amount of acid B to the amount of acid L in the total acid amount of the modified Y-type molecular sieve, which is measured by pyridine adsorption infrared method at 200 DEG C, is not lower than 2.30; when the molecular sieve is used for ultraviolet and visible light analysis, the ultraviolet and visible absorption spectrum is not absorbed at the wavelengthof 285-295 nm. The catalytic cracking catalyst is used for catalytic cracking of heavy oil, and has the advantages of low coke selectivity, high gasoline yield, high liquefied gas yield and high isohydrocarbon content in gasoline.

A process for preparing Y-type zeolite features that a raw Y-type zeolite is contacted with an atomsphere at 450-700 deg.C for 1-10 hr. Said atmosphere contains water vapour, ammonia component, chlorine component and/or fluorine components.