54results about How to "Reduce the ratio of silicon to aluminum" patented technology

The invention discloses a ZSM-48 molecular sieve with a low silica-alumina ratio and a preparation method thereof. The molecular sieve has the following properties: the molar ratio of silica to alumina is 25-50; the specific surface is 250-400 m2 / g; the pore volume is 0.25-0.35 cm3 / g; the average pore size is 3-5 nm. The preparation method comprises the following steps: (1) well mixing a seed crystal S, a template R, a silicon source, an aluminium source, sodium hydroxide and water to prepare a reaction mixture, wherein the composition of the reaction mixture is as follows: on a basis of oxide, the molar ratio of R to SiO2 is 0.05-0.2, the molar ratio of SiO2 to Al2O3 is 30-50, the molar ratio of Na2O to SiO2 is 0.06-0.1, the molar ratio of H2O to SiO2 is 15-23, the mass ratio of S to SiO2 is 0.05-0.5, S is the ZSM-48 molecular sieve, and R is 12-crown ether-4; (2) performing hydrothermal crystallization of the reaction mixture prepared in step (1) at 150-170 DEG C for 4-8 days, performing filtration, washing, drying, and roasting of the crystallization product to obtain the ZSM-48 molecular sieve with a low silica-alumina ratio. The ZSM-48 molecular sieve prepared by the method of the invention has a low silica-alumina ratio, and has good application prospects in technical fields of isodewaxing and the like.

The invention relates to a preparation method for a ZSM-48 molecular sieve. The method comprises the steps of mixing silicon source, aluminium source, alkali, water and template uniformly; crystallizing, filtering, washing, drying and roasting to obtain the ZSM-48 molecular sieve, wherein the template is dibromohexane (DBH), trimethylamine (TMA) and ethanol (ETA); and properly adjusting the amount of the reaction mixture, and thus the ZSM-48 molecular sieve is obtained. Compared with a molecular sieve prepared by a conventional technology, the ZSM-48 molecular sieve synthesized by the method has the characteristics of low synthetic cost.

The invention discloses a synthetic method of a ZSM-48 molecular sieve with a low silica-alumina ratio. The ZSM-48 molecular sieve with the low silica-alumina ratio is prepared by the following steps: beta-zeolite synthesis waste liquid is used as a raw material part; the raw material, an organic template, a silicon source, an aluminium source, an alkali source and water are mixed into a gel mixture; a hydrothermal crystallization reaction is carried out, in order to obtain the ZSM-48 molecular sieve with the low silica-alumina ratio (SiO2 / Al2O3) which is lower than 100. In a condition without addition of crystal seed, silicon and aluminium substances existed in the heterogeneous molecular sieve waste liquid in primary and secondary constitutional unit forms are used for inducing synthesis of ZSM-48, and a novel and convenient synthesis approach with low cost is provided for preparing the ZSM-48 molecular sieve with the low silica-alumina ratio.

The invention discloses a hydrocracking catalyst containing Y molecular sieve and a preparation method thereof, which comprises the following components based on the total weight of the catalyst: 55% to 85% of silicon-aluminum carrier containing modified Y molecular sieve, and 15% to 15% of active metal 45%; wherein the modified Y molecular sieve unit cell constant is 2.425~2.455nm; the bulk phase silicon-aluminum ratio is 10-60, the surface layer silicon-aluminum ratio is 7-30, and the surface layer silicon-aluminum ratio is lower than the bulk phase silicon-aluminum ratio Ratio; specific surface area of ​​modified Y molecular sieve is 600~800m2 / g, pore volume is 0.40~0.70ml / g; infrared acid content is 0.3~1.5mmol / g; relative crystallinity is 70%~110%. The hydrocracking catalyst of the invention can be applied to the hydrocracking reaction of flexible production of chemical raw materials or middle distillate oil, and has good temperature raising sensitivity and operational flexibility.

The invention discloses a modified Y type molecular sieve and a preparation method thereof. The molecular sieve has the following properties: the total pore volume is 0.76-1.25ml / g, wherein the mesoporous volume is 0.55-1.05ml / g and the mesoporous volume is 65-90% of the total pore volume; the mole ratio of silicon oxide to aluminum oxide is 10-35; and the specific surface area is 680-1050m<2> / g. The preparation method comprises the following steps: under a stirring condition, adding the Y type molecular sieve into a pressure container filled with organic aqueous alkali; closing the system; increasing the pressure to 0.2-1.0MPa, and then increasing temperature to 50-90 DEG C and treating for 0.5-3 hours under constant temperature; and relieving pressure, performing suction filtration, drying and roasting, thereby acquiring the modified Y type molecular sieve. The molecular sieve has larger-size mesoporous distribution and can supply much more reaction space for macromolecules; the catalytic performance of the molecular sieve is promoted; and the preparation method is simple and is suitable for industrial application.

The present disclosure relates to a modified Y molecular sieve whose surface is rich in mesopores and a preparation method thereof. The bulk phase SiO of the modified Y molecular sieve 2 / Al 2 o 3 The molar ratio is 10.0~13.0, the total pore volume of BET method is not less than 0.38cm 3 / g, BET method secondary pore volume not less than 0.06cm 3 / g, unit cell parameters: a=b=c=2.44-2.46nm, based on the total weight of the modified Y molecular sieve, the content of sodium oxide in the modified Y molecular sieve is not more than 0.1% by weight. The modified Y molecular sieve has larger surface mesopore volume than conventional Y molecular sieves.

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.

The invention discloses a modified Y molecular sieve and a preparation method thereof, which have the following properties: the silicon-aluminum ratio of the bulk phase is 10-70, wherein the silicon-aluminum ratio of the surface layer is 7-30, and the silicon-aluminum ratio of the surface layer is lower than the silicon-aluminum ratio of the bulk phase Ratio 5~40, wherein the surface layer refers to the thickness range from the outer surface of the molecular sieve to the inside of 5~400nm; the unit cell constant of the modified Y molecular sieve is 2.425~2.455nm; the specific surface area of ​​the modified Y molecular sieve is 600~900m2 / g, the pores Content 0.20~0.70ml / g; infrared acid content 0.3~1.5mmol / g. The preparation method of the modified Y molecular sieve of the present invention is as follows: the Y molecular sieve after ammonium exchange is subjected to primary dealumination treatment, rapid drying, carbon deposition reaction, high-temperature roasting treatment, and then secondary dealumination treatment, drying, and charcoal burning treatment, A modified Y molecular sieve is obtained. The silicon-aluminum ratio of the surface layer of the molecular sieve of the invention is lower than that of the bulk phase, and has broad application prospects in the hydrocracking reaction process.

The invention discloses a modified Y-Beta composite molecular sieve as well as a preparation method and application thereof. The preparation method comprises the following steps of under a stirring condition, adding a Y-Beta composite molecular sieve into a pressure container full of an organic base solution, sealing a system, pressurizing to 0.2 to 1.0MPa, then heating to 50 to 90 DEG C, treating for 0.5 to 3 hours at constant temperature, depressurizing, carrying out suction filtration, drying, and roasting to obtain the modified Y-Beta composite molecular sieve. The modified Y-Beta composite molecular sieve prepared through the method has mesopore pore size distribution with a larger size, can provide more reaction spaces for macromolecules, and is beneficial to improving a catalytic performance of the molecular sieve, simple in the preparation method, and applicable to industrial application.