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

The present invention relates to a preparation method of rare earth overstable Y zeolite. It is characterized by that said method includes the following steps: using mixed solution formed from rare earth salt and citric acid or mixed solution formed from inorganic ammonium salt, rare earth salt and citric acid to treat zeolite. Said zeolite can be used as active component of cracking catalyst, and has the advantages of reducing olefin content of catalytic cracked gasoline and obviously raising catalytic cracked light oil yield.

The invention relates to a modification method of Y molecular sieve. The method is characterized in that surfactants are added in the acid dealumination process, that is, industrial NaY molecular sieves are used as raw materials through ammonium exchange, and after deep roasting, acid dealumination is carried out under the protection of surfactants, and a higher SiO2 / Al2O3 ( 9-15) HY molecular sieves while maintaining high crystallinity. Compared with industrial NaY molecular sieves, the secondary pores of the molecular sieve prepared by this method are greatly improved, and the acid structure is also further improved. Support for hydrotreating catalysts for heavy distillate oils.

The invention relates to a molecular sieve desulfurizer and a preparation method thereof. The method comprises heating a NaY molecular sieve and an ammonium salt solution in a water bath of 80-100 DEG C for ammonium exchanging, treating the ammonium-exchanged molecular sieve with inorganic acid or / and organic acid aqueous solutions, preparing an aqueous solution containing lanthanum and cerium with a concentration of 0.05-0.08 mol / L to exchange and modify the obtained molecular sieve ions until an exchange degree of the exchanged and modified lanthanum or cerium is 71-73 %, molding, drying and roasting the modified molecular sieve, and using an isopyknic immersion method to load transition metal elements so that a mass percent of loaded metals (on basis of oxide) is 10.0-20.0 %. Therefore, adsorptivity, selectivity and stability of the desulfurizer is well distributed, the experiment is simple to operate, raw materials are cheap and easy to purchase, a preparation process is simple, and no poisonous and harmful substances are generated.

The present invention discloses a high octane number gasoline production method, which is used for processing catalytic diesel fuel so as to produce the high octane number gasoline distillate, wherein the process mainly adopts 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 is provided with an isomerization catalyst, the tower bottom oil is circulated to the material inlet of the tower, a hydrogen circulation heating furnace is arranged, the heated hydrogen gas enters the bottom portion of the tower, the gasoline distillate is obtained from the top of the tower, and a small amount (less than 2%) of the diesel fuel distillate is periodically discharged from the bottom of the tower. According to the method of the present invention, the characteristics of the hydrocracking and the reaction distillation process are completely utilized, such that the secondary cracking reaction of the light distillate is reduced, the liquid yield is increased, and the gasoline distillate yield is more than 90%. With the method of the present invention, the catalytic diesel fuel is completely catalyzed, the octane number of the produced is high, and compared with the conventional hydrogenation process, the method of the present invention has characteristics of simple process and energy saving.

The invention belongs to the technical field of supporting facilities of electrical measurement devices, and provides a method for manufacturing electrodes with small electrode constants. Teflon is adopted by an electrode fixing material capacitance pool pole plate support and a sample pool in a capacitance pool body; a teflon base of the capacitance pool pole plate support enables the length of an inner electrode pole plate to be smaller than that of an outer electrode pole plate, and therefore the base and the cylindrical outer electrode pole plate also form a part of electrodes, in the measuring process, the inner electrode pole plate can be completely soaked in solution, and when the solution is affected by temperature changing to expand or contract in the measuring process, the corresponding area between the inner electrode pole plate and the outer electrode pole plate is not changed; three small round holes with the diameters being about 1 mm are formed in the upper edge of the cylindrical outer electrode pole plate, so that gas between the two pole plates conveniently flows out when the electrodes are soaked in the solution, and experiment errors caused by gas are reduced. The electrodes manufactured through the method are small in electrode constant, convenient to operate and use, small in error and suitable for measuring the conductivity, capacitance and dielectric constants of a heavy oil system.

A silica-alumina carrier containing two kinds of modified molecular sieves, including modified Y molecular sieve, modified ZSM-23 molecular sieve and amorphous silica-alumina, the modified Y molecular sieve used in the inventive carrier is deeply dealuminated Y molecular sieve with complete crystal form, High silicon-aluminum ratio, low acid center density, high proportion of medium-strong acid, abundant secondary pores, suitable for use as acidic cracking component of medium oil hydrocracking catalyst, high specific surface area and developed secondary pores of molecular sieves not only facilitate the process of hydrocracking The hydrogen activity is exerted, and it is beneficial to the diffusion of reaction products. The secondary pores are many, and the acid center density is low, which reduces the probability of excessive cracking and secondary cracking, so that the catalyst has excellent medium oil selectivity and high silicon-aluminum ratio. , the unit cell constant is small and the structure is stable, so the catalyst has good stability.

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 an ultra-stabilization treatment method for an in-situ crystallization catalyst with high rare earth content. The method is to exchange the in-situ crystallized NaY type catalyst with ammonium ions and rare earth ions for many times, and then exchange the in-situ crystallization catalyst under different temperature gradient conditions. Under high-temperature hydrothermal roasting, an ultra-stable catalyst product with high rare earth content and a unit cell constant lower than 2.455nm is prepared. The catalyst obtained by the present invention has high rare earth content, high silicon-aluminum ratio, good activity, stability and Excellent coke selectivity and other characteristics.

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 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.

The invention discloses a reaction distillation method of catalytic diesel oil. The method is used for processing catalytic diesel oil to produce naphtha with a high octane number and high-quality diesel oil; the equipment comprises a reaction distillation column and a hydrogen circulation system; a stripping section of the reaction distillation column is a packed column and packed with a hydrocracking catalyst, and a rectifying section is equipped with a rectifying column plate. The naphtha fraction is obtained at the column top, and the diesel oil fraction is obtained at the column bottom. The method of the invention makes full use of the characteristics of hydrocracking and reaction distillation technology, reduces the secondary reaction of light fractions, and improves the hydrogenation reaction depth of the inferior diesel oil fraction. The method of the invention adopts inferior catalytically-cracked diesel oil as a raw material to produce naphtha with a high octane number and high-quality diesel oil which can be used respectively as a blending component of gasoline with a high octane number and a blending component of high-quality diesel oil; when compared with traditional hydrogenation technology, the method of the invention omits the product fractionating tower, is simpler and more energy-saving in process flow.