30results about How to "High crystal retention" patented technology

The invention relates to a method for removing organic amines in beta zeolite, which mainly solves the problems of troublesome operation, unsafe operation or easy loss of zeolite framework aluminum in the prior art. The present invention preferably solves this problem by adopting the technical scheme of direct four-stage roasting in an air atmosphere. The four-stage roasting process is as follows: the first stage is fired at 110-180°C for 0.5-4.0 hours, and the second stage is fired at 230-300°C. ℃ for 1.0 to 6.0 hours, the third stage for 0.5 to 6.0 hours at 360 to 430°C, and the fourth stage for 2.0 to 10.0 hours at 530 to 580°C. The method of the present invention can be used in the industrial preparation of zeolite beta.

The invention discloses a making method of NaY molecular sieve with small grain size, which comprises the following steps: synthesizing guide agent; forming silicon aluminium gel; aging under 10-85 deg.c for 5-50h; adding additive with molar rate of Al2O3 and silicon-aluminium gel at 0.1-1000; crystallizing; recycling product; selecting the additive from one or more of amorphous SiO2, Al2O3, Al2O3primer, ZrO2, AlPO4, TiO2, alumina silica gel and clay.

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 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 relates to a preparation method of a cracking catalyst, which comprises: raw materials and water are mixed to prepare a slurry solution by utilizing the catalyst containing a Y type molecular sieve and a silicon vector; the slurry solution is dried to obtain a catalyst precursor; the catalyst precursor is baked; and a contact reaction is carried out on the catalyst precursor and an acidic ammonium salt solution. The preparation method of the cracking catalyst can enhance the crystallization retaining degree of the Y type molecular sieve in the catalyst and the stability of the catalyst. The catalyst prepared by utilizing the method is used for the catalytic cracking of heavy oil and has the advantages of strong conversion capability of the heavy oil, high yield of gasoline, and low sulphur content in the gasoline.

The invention relates to a catalytic cracking catalyst and a preparation method. The catalyst contains a cracking activity component, a mesoporous silicon-aluminum material, clay and an adhesive, wherein the cracking activity component comprises a Y-type molecular sieve and an MFI-structure molecular sieve; the Y-type molecular sieve comprises a first Y-type molecular sieve; and the rare-earth content in the first Y-type molecular sieve is 10-25 wt% on the basis of rare-earth oxides, the cell constant is 2.440-2.472nm, the crystallinity is 35-65%, the silicon / aluminum atomic ratio in the framework is 2.5-5.0, and the product of the ratio of 2theta=11.8+ / -0.1 degree peak intensity I1 to 2theta=12.3+ / -0.1 degree peak intensity I2 in an X-ray diffraction pattern and the rare-earth weight percent in the molecular sieve on the basis of rare-earth oxides is greater than 50. The preparation method comprises the following steps: preparing a mixed slurry containing the cracking activity component, mesoporous silicon-aluminum material, adhesive and clay, carrying out spray drying, washing and drying. The catalyst has higher conversion rate and liquefied gas yield, and can reduce the consumption of the molecular sieves in the catalyst, thereby lowering the catalyst production cost.

The invention discloses a catalytic cracking catalyst. The catalytic cracking catalyst is prepared from, by weight, 20-45 parts of active components, 35-45 parts of clay and 10-45 parts of adhesive. The adhesive is calculated based on oxide, and the adhesive is phosphorus silica-alumina gel. The invention further discloses a preparation method of the catalytic cracking catalyst. The preparation method includes the steps that the clay and deionized water are mixed and pulped to be fully uniform, the active components and the adhesive are added into pulp, mixing and stirring are conducted, spray drying and pelleting are conducted after acidification, and a head product is obtained; the head product is calcined at the set temperature, a calcined product is obtained, and the cauterant decrease of the calcined product is controlled; the calcined product and silicon tetrachloride are subjected to a contact reaction at a set ratio, the reaction temperature is controlled at the set temperature, the product is washed, filtered and dried after the reaction is completed, and the catalytic cracking catalyst is obtained. According to the catalyst, multiple times of exchange and calcination of the active components are not needed, and the process is simple and environmentally friendly. The adopted phosphorus silica-alumina gel is good in adhesion, no acid gas is generated in the calcination process, equipment is prevented from being corroded, and the energy consumption and the production cost of the catalyst are reduced.

The invention relates to a catalytic cracking catalyst and a preparation method. The catalytic cracking catalyst contains a cracking activity component, clay and an adhesive, wherein the cracking activity component a first Y-type molecular sieve, a second Y-type molecular sieve and a third Y-type molecular sieve; the first Y-type molecular sieve is a rare-earth Y-type molecular sieve, the rare-earth content in the first Y-type molecular sieve is 10-25 wt% on the basis of rare-earth oxides, the cell constant is 2.440-2.472nm, the crystallinity is 35-65%, the silicon / aluminum atomic ratio in the framework is 2.5-5.0, and the product of the ratio (I1 / I2) of 2theta=11.8+ / -0.1 degree peak intensity I1 to 2theta=12.3+ / -0.1 degree peak intensity I2 in an X-ray diffraction pattern and the rare-earth weight percent in the molecular sieve on the basis of rare-earth oxides is greater than 50; the second Y-type molecular sieve is a rare-earth-containing gas-phase overstable Y-type molecular sieve; and the third Y-type molecular sieve is a rare-earth-containing DASY molecular sieve. The preparation method comprises the following steps: preparing a slurry containing the cracking activity component, adhesive and clay, and carrying out spray drying. The catalyst has higher conversion rate and gasoline yield, and can reduce the consumption of the molecular sieves, thereby lowering the cost.

The present invention relates to a modified Y molecular sieve having regular mesopore-micropore, and a preparation method thereof, wherein the molar ratio of the skeleton SiO2 / Al2O3 of the modified Ymolecular sieve is 5.0-6.0, the specific surface area of the mircopore is 400-600 m<2> / g, the pore volume of the micropore is 0.25-0.35 cm<3> / g, the specific surface area of the mesopore is 30-200 m<2> / g, the pore volume of the mesopore is 0.07-0.85 cm<3> / g, the pore size of the mesopore is 2.0-6.0 nm, and based on the total weight of the modified Y molecular sieve, the sodium oxide content in themodified Y molecular sieve is not more than 0.1 wt%. According to the present invention, the mesopore is introduced while the micropore of the Y molecular sieve is retained, and the mesopore and themicropore have connectivity so as to easily achieve the macromolecule diffusion.

The invention relates to a catalytic cracking catalyst and a preparation method. The catalytic cracking catalyst contains a cracking activity component, a mesoporous silicon-aluminum material, clay and an adhesive, wherein the cracking activity component comprises a rare-earth Y-type molecular sieve; and the rare-earth content in the Y-type molecular sieve is 10-25 wt% on the basis of rare-earth oxides, the cell constant is 2.440-2.472nm, the crystallinity is 35-65%, the silicon / aluminum atomic ratio in the framework is 2.5-5.0, and the product of the ratio (I1 / I2) of 2theta=11.8+ / -0.1 degree peak intensity I1 to 2theta=12.3+ / -0.1 degree peak intensity I2 in an X-ray diffraction pattern and the rare-earth weight percent in the molecular sieve on the basis of rare-earth oxides is greater than 50. The preparation method comprises the following steps: preparing a mixed slurry containing the cracking activity component, mesoporous silicon-aluminum material, adhesive and clay, and carrying out spray drying. Compared with the prior art, the rare-earth-containing Y-type molecular sieve is matched with the mesoporous silicon-aluminum material, so that the catalyst has higher thermal and hydrothermal stability and higher heavy oil cracking capacity, and can reduce the consumption of the molecular sieves in the catalyst, thereby lowering the catalyst production cost.