195results about How to "High ratio of silicon to aluminum" 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 relates to a synthesis method of fine grain ZSM-5 zeolite molecular sieve with high silicon aluminium ratio, which comprises using a surface active agent, charging it into acidified aluminium salt solution, then slowly dropping alkaline solution formed from sodium silicate, template agent and seed crystal into aluminium saline solution, the overall composition of the obtained reaction mixture being Na2O:Al2O3:SiO2:H2O=1.5-4.0:1:20-280:500-2000 by mol ratio, then subjecting the reaction mixture to thermal crystallization through the conventional method.

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 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 discloses a method for preparing a Cu-SSZ-13 catalyst through an in-situ synthesis method. A Cu-SSZ-13 molecular sieve sample is prepared by taking acid as an exchange reagent and treating through an in-situ synthesis method. Compared with the currently used ammonium nitrate ion exchange method, the after treatment method for the Cu-SSZ-13 molecular sieve prepared through an in-situ synthesis method is more environment-friendly and effective; the activity of the prepared catalyst is higher; and the hydrothermal stability is better. According to the method, the silica-alumina ratio of the molecular sieve structure is increased while the catalyst having high catalytic activity is obtained; and the obtained Cu-SSZ-13 catalyst has excellent hydrothermal stability, wide temperature window and excellent N2 selectivity, and is very applicable to purification of tail gas from diesel cars.

The invention relates to a method for preparing a NaY molecular sieve with a high aluminum-silicon ratio, which comprises the following steps of: mixing a silicon source, an aluminum source and deionized water, uniformly mixing two guide agents in different molar ratios, water glass, acidic aluminum salt and sodium aluminate solution in a molar ratio of gel materials to prepare two gels, and crystallizing respectively, wherein the molar ratio of the gel materials is (1.0-6.5)Na2O:Al2O3:(5.0-18)SiO2:(100-280)H2O, and Al2O3 in the guide agents accounts for 0.01 to 15 percent of the total weightof Al2O3; uniformly mixing the two gels in a mass ratio of 1:(0.1-10) to prepare a mixed gel; and crystallizing the prepared mixed gel at the temperature of between 80 and 120 DEG C for 2 to 50 hoursto prepare the NaY molecular sieve. Compared with the prior art, the method has the advantages that: the NaY molecular sieve with the high aluminum-silicon ratio can be prepared in shorter time underthe condition of the same feeding molar ratio.

The invention relates to a USY molecular sieve modification method. The USY molecular sieve modification method comprises the following steps of adding a citric acid solution having a concentration of 0.10-0.35mol/L into a USY molecular sieve according to a solid-liquid quality ratio of 1: 5 for modification with stirring at a reaction temperature of 500-1200 DEG C, after a temperature is increased to a preset temperature of 600-900 DEG C, adding an ammonium fluosilicate solution having a concentration of 0.05-0.20mol/L into the reaction product at a rate of 0.1-3.5ml/min according to a volume ratio of citric acid to the ammonium fluosilicate solution of 0.5-3.0, after material addition, carrying out a reaction process at a temperature of 50-120 DEG C for 1-6h, carrying out washing by deionized water until a pH value is 7, and carrying out constant-temperature drying at a temperature of 110 DEG C. The USY molecular sieve obtained by the USY molecular sieve modification method has substantially improved specific surface, secondary pore volume and moderate strong acid level and can be used for a hydrocracking catalyst for maximizing middle distillates as desired products.

The process of synthesizing NaY molecular sieve includes the following steps: synthesizing guide agent; mixing the guide agent, water glass, acid aluminum salt and sodium aluminate to obtain gel; crystallizing the gel; and filtering, washing and drying. The preparation process features the step of crystallizing the gel, and the step includes first crystallization at 80-120 deg.c for 0.1-70 hr and subsequent addition of one kind of silicon-containing matter in the amount of molar ratio between SiO2 and the Al2O3 in the gel in 0.1-10 before further crystallization for 1-50 hr. The said preparation process has shortened crystallization time and increased Si/Al ratio in the NaY molecular sieve product.

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 preparation method of the NaY molecular sieve with high silica-alumina ratio includes: preparing the high alkalinity silica-alumina gel (3.0-6.0)Na2O:Al2O3:(7-20)SiO2:(100-600)H2O and the low alkalinity silica-alumina gel (0.5-3.0)Na2O:Al2O3:(7-20)SiO2:(100-600)H2O obtained by evenly mixing conventional directing agent, silicon source, aluminum source and water, heating up the high alkalinity silica-alumina gel to 90-110 DEG C, crystallizing for 0.5-20 hours, adding the low alkalinity silica-alumina gel, filtering, washing, drying and obtaining the NaY molecular sieve. The modified NaY molecular sieve is applicable to the catalyst preparation of catalytic cracking, hydrogen cracking and isomerization.

The invention relates to a method for preparing a high-performance hydrocracking catalyst, which comprises the following steps: preparing amorphous aluminium-silicon into a paste material of which the pH value is between 3.0 and 5.5, evenly mixing Y zeolite solid powder of modified rare earth with the paste material of the amorphous aluminium-silicon, and then drying and dehydrating the mixture to prepare a moldable paste so as to prepare a catalyst carrier through molding, drying, and calcining, and finally obtaining the final hydrocracking catalyst by loading hydrogenation metal components through an impregnation method. The hydrocracking catalyst prepared by the method has the advantages of high activity and middle oil selectivity, and strong nitrogen resisting performance and water resistance, thus the hydrocracking catalyst can be used in the process of an unrefined single-stage hydrocracking, which not only can be used for processing heavy oil fraction of oil, but also can be used for processing heavy raw materials of other sources, such as the heavy distillate of coal liquefaction oil.

The invention provides a synthetic method for NaY zeolite with a high silica-alumina ratio. The method comprises the main steps: according to the proportioning requirement of a directing agent to uniformly mix a silicon source, an aluminium source and water, and ageing at 15 DEG C-60 DEG C for 0.5-120 h, so as to prepare the directing agent; according to the proportioning requirement of a gel reaction mixture to adding the directing agent and an alkaline solution into a silicone source at 10 DEG C-90 DEG C, stirring for 1 h-80 h, and stirring uniformly to obtain the gel reaction mixture; performing crystallization on the gel reaction mixture at 80-120 DEG C for 10-50 h, and then filtering, washing and drying to prepare NaY zeolite. The method does not employ a template, the preparation of the directing agent is mild in temperature, NaY zeolite with high crystallization degree and the high silica-alumina ratio is synthesized at a relatively short crystallization time. Also the method is capable of replacing conventional production technology without changing current apparatuses for industrial production, and has great important meaning on improving performances of catalytic cracking catalysts.

The invention discloses one Y zeolite compound material's synthesizing method, its characteristic lay in this method includes the kleit roasts under 500 - 900 íµ temperatures the dehydration transforms the leaning kleit, the smashing, then made the particle size which is smaller than 230 microns powder, then joined the sodium silicate, the guide medicinal preparation, the sodium hydroxide and the water, the crystallization, filtered, the collection mother liquor, and then collect the mother liquor direct sales commission, which played partial or the complete sodium silicate and the sodium hydroxide role.

The invention discloses a synthesizing method of high-silicon aluminium rate octahedra zeolite, which is characterized by the following: adopting moulding agent to synthesize the product through hydrothermal crystallizing method under fitful sodium condition directly.

The invention relates to a modification treatment method of a Y-type zeolite. The method comprises the following steps: carrying out ammonium exchange and direct burning on industrially-produced common NaY zeolite, repeating the ammonium exchange and direct burning for at least three times, then subjecting the NaY zeolite to a water steam treatment at a high temperature, and finally processing the NaY zeolite by a critic acid solution. The silicon/aluminum ratio of processed Y-type zeolite is in a range of 9 to 11, and the specific surface area of the processed Y-type zeolite is in a range of 550 to 650 m2/g. Furthermore, the zeolite stability is improved, the sodium content is decreased, at the same time the amorphous aluminum out of the skeleton is removed, secondary mesopores (3-20 nm) are generated in the Y-type zeolite, strong acid centers are generated at the meantime, no environmental pollutant is generated during the treatment process, the efficiency is high, the modification treatment method is environment-friendly, the whole process is carried out on the basis of conventional modification treatments, and the provided method is suitable for massive preparation of Y-type zeolite with a high silicon/aluminum ratio through modification on NaY zeolite.

The invention provides a NaY molecular sieve aggregate with a nano-micro structure and a preparation method thereof. The method comprises the following steps of synthesizing a guide agent; preparing reaction gel by using the guide agent; performing crystallization on the reaction gel to obtain the NaY molecular sieve aggregate with the nano-micro structure, wherein organosilicon quaternary ammonium salt is introduced in the process of synthesizing the guide agent and/or preparing the reaction gel. The technical scheme provided by the invention has the advantages that the process is simple; thecost is low; the finally obtained product has a series of advantages of complete crystal phase, high silicon-aluminum ratio, high specific area, rich mesoporous-microporous structure, controllable crystal particle dimension and the like.