913 results about "Molecular sieve" patented technology

The present application relates to the technical field of ZSM-5 molecular sieve preparation, and provides a high-crystallinity aluminum-rich ZSM-5 molecular sieve, a preparation method and application thereof.The preparation method of the high-crystallinity aluminum-rich ZSM-5 molecular sieve provided by the present application realizes the skeleton composition control of the ZSM-5 molecular sieve by adding a second aluminum source and then performing secondary crystallization, solves the technical bottleneck that it is difficult to directly synthesize the high-crystallinity aluminum-rich ZSM-5, breaks through the lower limit of the Si / Al ratio phase region of the artificial in-situ synthesis of the molecular sieve, effectively controls the crystal parameter and improves the production efficiency, realizes the precise construction of the high-crystallinity aluminum-rich ZSM-5 molecular sieve, and thus enhances the micropore crystallinity of the molecular sieve, optimizes the acid distribution, greatly enriches the metastable surface active acid center distribution of the molecular sieve, and has good aromatic hydrocarbon conversion performance.

This invention relates to the field of molecular sieve synthesis, specifically to a SAPO-11 molecular sieve, its preparation method, and its applications. This molecular sieve is a spherical aggregate with a diameter of 2-50 μm, composed of primary nanosheet crystals with a thickness of 15-50 nm. The median pore size of the molecular sieve is 1550-1700 nm. The SAPO-11 molecular sieve of this invention has a small crystal size and a long service life.

This invention relates to a hydrogen-form ZSM-48 molecular sieve, its synthesis method, and its applications. The hydrogen-form ZSM-48 molecular sieve has an average mesopore size of 6 nm to 30 nm, a B / L acid ratio of 0.7 to 3.4, and a specific surface area of ​​100 m². 2 / g~500m 2 / g. The synthesis method of the hydrogen-form ZSM-48 molecular sieve includes the following steps: (1) Under contact conditions, silicon source, aluminum source, template agent and water are mixed evenly to obtain a gel; (2) The gel obtained in step (1) is subjected to hydrothermal crystallization treatment, and then washed, dried and calcined to obtain hydrogen-form ZSM-48 molecular sieve. The template agent in step (1) includes hexamethylammonium hydroxide and urea; preferably, the template agent also includes urease. The synthesis method controls the molecular sieve pore size and B / L acid ratio by introducing urease and using a two-stage hydrothermal treatment method, thereby realizing the control of molecular sieve properties according to the target reaction characteristics, which is beneficial to improving the yield of low-branched isoalkanes and improving the quality of lubricating oil base oil.

The present application relates to a kind of phenol and methanol directly prepared (methyl) anisole mode, the method includes the following steps: under the action of composite catalyst, phenol and methanol are catalytically generated methyl anisole, the composite catalyst is Ho / β molecular sieve catalyst and Ti / UiO-66 with mass ratio Ho / β:Ti / UiO-66 0.3-0.6:1 Mixed composite catalyst.The process reaction step is simple, and synthesis is realized in one step, and the total selectivity of methyl anisole is as high as 76% or more, and can be continuously and stably operated for 3000h.

This invention discloses an apparatus and method for separating carbon dioxide and nitrogen using an inorganic membrane. The apparatus includes at least: a metal outer shell with a mixed gas inlet, a permeate-side outlet, and a residual gas outlet; multiple membrane tubes arranged laterally within the outer shell, sealed and fixed within the shell by a tube sheet to form a shell side and a tube side; the membrane tubes are a structure combining a support and a separation membrane, the separation membrane being a molecular sieve membrane; and multiple baffles arranged radially and alternately along the membrane tubes to form a baffled gas channel. This invention, by using a microporous inorganic molecular sieve membrane as the separation medium and incorporating baffles outside the membrane tubes within the outer shell, effectively increases the separation efficiency of carbon dioxide and nitrogen, thereby significantly improving the performance of membrane separation in capturing carbon dioxide from flue gas.

The utility model provides a kind of solid raw material dewatering equipment for three-proofing glue production, belong to the technical field of glue production, including bearing mechanism, including adsorption tower, fixed installation in the top of adsorption tower pipe body and the sealing cover of movable installation in the top of pipe body;Mounting mechanism, including ring sleeve.The utility model is by box body and support disc to realize molecular sieve granule board whole quick replacement, greatly shorten downtime, avoid production interruption;Sealing cover and mechanical interlock's positioning assembly ensure that adsorption tower is airtight when disassembling, prevent air moisture absorption or dust leakage;Spring support and limiting structure of jacking assembly auxiliary one-key type release locking mechanism, reduce artificial intervention, avoid the risk of forcible disassembly when high temperature is not pressure relief;Prepackaged filling type molecular sieve granule board is directly replaced, and particle crushing and pipeline pollution are eliminated.These designs comprehensively improve replacement efficiency, safety and sealing, solve the production bottleneck and hidden danger of traditional replacement mode.

The utility model discloses a three -way subassembly for molecular sieve oxygen generator, including a central pipeline and two bypass pipelines, two bypass pipelines inside respectively are equipped with check valve, and bypass pipeline includes transverse bypass pipeline and longitudinal bypass pipeline, is equipped with transverse main bypass through -hole in transverse bypass pipeline, is equipped with longitudinal main bypass through -hole in longitudinal bypass pipeline, and longitudinal bypass pipeline is close to the position of outer circumferential edge and is equipped with with longitudinal main bypass through -hole isolation's multiple longitudinal back flushing through -hole, is equipped with with transverse main bypass through -hole isolation's bypass back flushing through -hole in transverse bypass pipeline, is equipped with with main center through -hole isolation's center back flushing through -hole in central pipeline, and the both ends of center back flushing through -hole are communicated with respectively in two bypass pipelines bypass back flushing through -hole connection. The utility model forms the independent back flushing through -hole between two bypass pipelines, can realize the purpose of back flushing nitrogen -removing of molecular sieve cylinder through multiple back flushing through -holes to improve nitrogen -removing effect and oxygen -making efficiency.

The application belongs to the technical field of molecular sieve catalytic material preparation, and particularly relates to a method for preparing a zinc-modified HZSM-5 molecular sieve catalyst by a double-bed in-situ reduction method and application thereof. The application forms a double-bed structure by loading ZnO and HZSM-5 molecular sieves in the same reaction tube respectively, and performs in-situ reduction treatment under a hydrogen-containing atmosphere, so that zinc species acts on the HZSM-5 molecular sieve in a mode different from traditional ion exchange methods and impregnation methods, thereby obtaining a zinc-modified HZSM-5 molecular sieve catalyst. The method is clear in steps and simple in operation, and can be used for adjusting the structural properties, acid characteristics and catalytic performance in a methanol-to-aromatics reaction of the HZSM-5 molecular sieve.

A regenerative adsorption-type curing chamber includes a curing chamber body, a circulating fan for introducing air into the curing chamber body during the electrode curing stage, an electric heater, a molecular sieve adsorber for adsorbing moisture from the air during the electrode drying stage and desorbing the adsorbed moisture during the electrode curing stage for humidification, and an air compressor for pressurizing air and sending it into the molecular sieve adsorber for dehydration during the electrode drying stage. The air inlet of the circulating fan is connected to the air outlet at the top of the curing chamber; the air outlet of the circulating fan is connected to the air inlet of the electric heater; the air inlet of the air compressor is connected to the air outlet of the electric heater; the air outlet of the air compressor is connected to the air inlet at the bottom of the molecular sieve adsorber; and the air outlet of the molecular sieve adsorber is connected to the air inlet at the bottom of the curing chamber. During the electrode drying stage, moisture is adsorbed in the molecular sieve desiccant, which greatly accelerates the electrode drying speed and saves energy consumption in this process. During the curing stage, the moisture adsorbed inside the molecular sieve is desorbed and enters the curing chamber for humidification, saving water during the curing stage.

This invention provides a desulfurizing agent, its preparation method, and its application. The preparation method of the desulfurizing agent includes: mixing a first structure-directing agent, a second structure-directing agent, a first silicon source, and a first aluminum source in water, then adding ZSM-5 molecular sieve seed crystals for uniform dispersion, hydrothermal crystallization, and calcination to obtain ZSM-5 molecular sieve nanocrystals; mixing a solution of ZSM-5 molecular sieve nanocrystals, a binder, a pore-expanding agent, and an active metal salt, extruding and molding, and calcining to obtain the desulfurizing agent; wherein the first structure-directing agent is selected from quaternary ammonium bases and / or quaternary ammonium salts, and the second structure-directing agent is selected from quaternary ammonium bases; the cation charge density of the first structure-directing agent is higher than that of the second structure-directing agent. The preparation method of the desulfurizing agent provided by this invention uses a dual-structure-directing agent and seed crystals to synergistically induce and regulate the crystallization process, thereby effectively controlling the mesoscopic structure of the desulfurizing agent and significantly improving its desulfurization activity.

The present application relates to a kind of heating cigarette reconstituted tobacco low-temperature flavor releasing heat-conducting glue and its preparation method, it is related to tobacco manufacturing technical field.Heat-conducting glue includes the following weight parts of component: low-temperature catalytic material 2~6 parts, heat-conducting filler 0.8~1.2 parts and matrix glue 100 parts;Wherein, low-temperature catalytic material is organic metal salt modified titanium-silicon molecular sieve, heat-conducting filler is silane coupling agent modified metal oxide powder.Low-temperature catalytic material can effectively catalyze tobacco aroma precursor material cracking in lower temperature range, significantly reduce the activation energy of aroma release, thereby improve aroma release efficiency, solve the problem of traditional reconstituted tobacco aroma release deficiency, tasteless.Using the metal oxide modified by silane coupling agent as heat-conducting filler, while improving the overall thermal conductivity of reconstituted tobacco, effectively reduce the interface thermal resistance between heat-conducting filler and tobacco matrix, make heat transfer more efficient and uniform, enhance the stability of smoke release.

This invention discloses a highly efficient catalytic synthesis process for nicotinamide intermediates using the field of organic synthesis technology. The process includes: adding appropriate amounts of dichloronicotinic acid, organic solvent, lanthanum-doped composite metal fluoride-diatomaceous earth supported catalyst, and encapsulated 4A molecular sieve to a reaction vessel under nitrogen protection; purging with nitrogen, heating, and stirring; introducing anhydrous dimethylamine gas, controlling the pressure, and continuing stirring; after the reaction is complete, washing with sodium bicarbonate aqueous solution, washing with deionized water, drying, concentrating, and recrystallizing to obtain the target product. The lanthanum-doped composite metal fluoride-diatomaceous earth supported catalyst prepared by this invention is recyclable, has mild reaction conditions, high product yield, is environmentally friendly, and suitable for industrial production.

The application discloses a processing method of aromatic raffinate oil. The method comprises the following steps: (1) contacting and reacting aromatic raffinate oil, hydrogen and a hydroconversion catalyst in a hydroconversion reaction zone, wherein the hydroconversion catalyst is a molecular sieve catalyst, and the molecular sieve is selected from any one of mordenite or ZSM-5 molecular sieve; (2) separating the hydroconversion reaction effluent obtained in the step (1) to obtain a hydrogen-rich gas and a liquid phase stream; and (3) separating the liquid phase stream obtained in the step (2) to obtain a liquid phase product and a gas phase product. The method can effectively convert isomeric alkanes in the aromatic raffinate oil into n-alkanes, and improve the ethylene raw material quality.

The present application relates to a kind of Y type molecular sieve catalytic material for improving gasoline yield and selectivity and its preparation method, Y type molecular sieve catalytic material is obtained by the hydrothermal crystallization of reactive microspheres containing zirconium, reactive microspheres containing zirconium contain 85-99.9 wt% alumina matrix and 0.1-15 wt% zirconium oxide, and the zirconium oxide contains tetragonal phase crystalline zirconium oxide.The Y type molecular sieve catalytic material of the present application has better strength and cracking effect, and the catalyst containing the Y type molecular sieve catalytic material of the present application can improve the selectivity and yield of catalytic cracking gasoline.

The application discloses a method for selectively hydrogen-dealkylating aromatics and coupling xylene isomerization. + The method comprises the following steps: contacting aromatics, PX-lean C8 aromatics and a catalyst to perform selective hydrogen-dealkylation and xylene isomerization; wherein the catalyst comprises catalyst A, catalyst B and catalyst C, catalyst A is arranged upstream of catalyst B, and catalyst C is arranged downstream of catalyst B; wherein the catalyst A is a composite modified alumina; the catalyst B and the catalyst C are independently selected from group VIII metal modified molecular sieves. + The method provided by the application can concentrate a reaction unit to selectively hydrogen-dealkylate C8 10 C2 + The method can realize xylene isomerization in the PX-lean C8 aromatics while selectively hydrogen-dealkylating the side chains, and can cooperate with liquid phase transalkylation technology, so that an isomerization unit in an existing process is omitted, and device energy consumption, material consumption and investment are greatly reduced.

The utility model relates to carbon dioxide manufacturing technical field provides a kind of for carbon dioxide production's adsorption tower drying system to handle original carbon dioxide gas, and original carbon dioxide gas refers to the gas with moisture and alcohol after not passing through pre rectification tower rectification treatment, including the first adsorption tower and second adsorption tower of the first heating regeneration component, second heating regeneration component being set respectively, first adsorption tower and second adsorption tower are connected in parallel between liquefier and pre rectification tower;First heating regeneration component and second heating regeneration component all include the molecular sieve of array setting and adsorbent fixed between adjacent molecular sieve, and the heating regeneration process in first adsorption tower and second adsorption tower is independent of each other.The utility model is according to the process of " one open one spare " independent participation handles original carbon dioxide gas, and alcohol removal water in a adsorption tower, not only simplify the treatment process before carbon dioxide gas liquefaction, and improve the alcohol removal efficiency of adsorption tower.

The present application relates to a process for producing synthetic ammonia by using hydrogen-containing tail gas, comprising the following steps: S1: sodium cyanide tail gas is pressurized, then heated and water-cooled. S2: the impurity-removed tail gas is desulfurized. S3: the desulfurized tail gas is mixed with chlor-alkali tail gas, the mixed gas is heated and deoxidized. S4: the deoxidized tail gas is pressurized and enters a PSA (pressure swing adsorption) device for pressure swing adsorption treatment, obtaining high-purity hydrogen. In the PSA device, dehydrating, carbon dioxide, methane, carbon monoxide and nitrogen adsorbents are sequentially arranged. The carbon dioxide adsorbent is activated carbon modified by carbonate and strong alkali, and the nitrogen adsorbent is 13X zeolite molecular sieve modified by Na + and Ba 2+ and Ca 2+ ion exchange. S5: nitrogen reacts with the high-purity hydrogen obtained in step S4 to generate ammonia. The present application can improve the adsorption capacity of the adsorbent for impurity gas, thereby reducing the replacement frequency of the adsorbent, prolonging the service period and service life of the adsorbent, and improving the production efficiency.

Disclosed is a method of synthesizing a molecular sieve of MWW framework type, and molecular sieves so synthesized. The method comprises preparing a synthesis mixture for forming a molecular sieve of MWW framework type, said synthesis mixture comprising water, a silicon source, a source of a trivalent element X, a structure directing agent R, a source of alkali or alkaline earth metal cation M, and a source of poly(diallyldimethyl ammonium) cation (PDDA).

The application discloses a method for producing ethylene raw material. The method comprises the following steps: mixing hydrocracking light naphtha and hydrogen into a first hydroconversion reaction zone to react, and then the reaction effluent enters a separation system to obtain hydrogen-rich gas and a first hydroconversion product; the first hydroconversion product is separated to obtain ethane, propane, isobutane, isopentane and n-pentane; the isobutane is mixed with hydrogen into a second hydroconversion reaction zone, and the reaction effluent is separated to obtain n-butane; the second hydroconversion reaction zone is filled with a hydroconversion catalyst containing ZSM-35 molecular sieve; and the isopentane is recycled to the inlet of the first hydroconversion reaction zone. The first hydroconversion reaction zone is filled with a hydroconversion catalyst containing mordenite, and at least two catalyst beds are filled; and the active metal content of the hydroconversion catalyst decreases in turn along the flow direction. The method can effectively improve the proportion of normal alkanes in the product and improve the quality of the ethylene raw material.

This invention relates to the field of adipic acid synthesis technology and discloses a method for producing adipic acid with low N2O tail gas emissions. The method includes: Step S1. A first contact reaction is carried out between cyclohexene, hydrogen peroxide, and a first catalyst, wherein the first catalyst is a solid catalyst comprising a tungsten-doped titanium-containing molecular sieve; the liquid phase material from the contact reaction is subjected to oil-water separation to obtain an aqueous phase containing cyclohexane oxide and an oil phase containing cyclohexene; Step S2. A second contact reaction is carried out between the aqueous phase containing cyclohexane oxide and nitric acid and a second catalyst, wherein the second catalyst is a Cu-containing... 2+ V 5+ and Mo 6+ The method utilizes ionic liquid catalysts. It results in low N2O emissions, high exhaust gas absorption rate, low production cost, and is environmentally friendly, showing promising prospects for industrial application.

This invention discloses a selective CO2 capture device for industrial flue gas, relating to the field of industrial flue gas treatment and gas separation technology. The invention includes a distribution assembly, which comprises a distribution cylinder body. A rotating assembly is mounted on the inner wall of the distribution cylinder body. The rotating assembly includes a rotating support, and a gas storage assembly is mounted on the inner wall of the rotating support. A top cover is mounted on the top surface of the distribution cylinder body, and a driving arc block is mounted on the bottom surface of the top cover. A CO2 absorption assembly and a nitrogen absorption assembly are mounted on the outer wall of the distribution cylinder body. This invention uses the rotating assembly to drive the gas storage assembly to rotate, causing the driving arc block and the abutting arc block to periodically contact each other, thereby realizing a cyclic process of air intake to exhaust within the corrugated sleeve. The CO2 contained in the industrial flue gas is selectively absorbed by a solid amine adsorbent in the first reaction shell, and the nitrogen is selectively adsorbed by a carbon molecular sieve adsorbent in the second reaction shell, effectively achieving directional separation of gas components and improving gas purification efficiency and selective capture capability.

A kind of multilayer adsorption tower oxygen generator, including adsorption tower tank body and connecting pipeline, multiple molecular sieve trays are arranged in vertical direction in adsorption tower tank body, molecular sieve tray is equipped with multiple vertical direction extension micro air flow channel, the micro air flow channel of adjacent molecular sieve tray is aligned, and molecular sieve particle is arranged in the upper end and lower end of micro air flow channel.Multiple molecular sieve trays can form multilayer structure, and the multilayer adsorption tower oxygen generator can be adjusted after a certain period of use, for example, the lowermost molecular sieve tray is moved to the upper side, or the uppermost molecular sieve tray is moved to the lowermost end, effectively avoiding the problem of reducing nitrogen adsorption efficiency when the lower molecular sieve fails.This structure design makes a large amount of nitrogen be adsorbed before entering the adsorption tower, reduces the gas flow resistance, significantly improves the nitrogen adsorption capacity, thereby solving the technical problems that the molecular sieve will fail in the prior art, and the oxygen concentration decreases with the change of use time.

The present invention provides a process to prepare kerosene, the process at least comprising the steps of: (a) providing a syngas stream comprising hydrogen (H2) and carbon monoxide (CO); (b) subjecting the syngas stream provided in step (a) to a Fischer-Tropsch reaction thereby obtaining a Fischer-Tropsch product comprising at least 50 wt.% of compounds boiling above 370°C; (c) separating the Fischer-Tropsch product into at least a C1-C4 fraction, H2O and a C5+ fraction; (d) subjecting the C5+ fraction as separated in step (c) to hydroprocessing thereby obtaining a mixture comprising at least a kerosene fraction and a heavier fraction; (e) separating the mixture as obtained in step (d) thereby at least obtaining the kerosene fraction and the heavier fraction, wherein the kerosene fraction has a Final Boiling Point of at most 302°C, preferably at most 300°C as determined by ASTM D86-18 and a flashpoint of at least 38°C as determined by IP170, wherein in the separation of step (e) the effective cut point, as determined by ASTM D2892-15 X2, between the kerosene fraction and the heavier fraction is at least 315°C and at most 330°C, and wherein in step (e) a kerosene yield of above 70 wt.% is obtained, based on the weight of the C5+ fraction subjected to hydroprocessing in step (d); (f) recycling at least a part of the heavier fraction as obtained in step (e) to the hydroprocessing of step (d); wherein step d) is carried out by contacting the C5+ fraction with a first catalyst, wherein the first catalyst comprises a molecular sieve with a pore size between 5 and 7 angstrom and a SiO2 / AlO3 ratio of at least 25 and a group VIII metal.

The utility model discloses a carbon molecular sieve shock attenuation transport device relates to carbon molecular sieve transport technical field, the utility model discloses a base is provided with a plurality of damping mechanism and a plurality of mounting mechanisms on the base, the top of base is provided with a plurality of chute no.

This invention discloses a method for preparing ZSM-5 molecular sieves using a microwave-assisted method with desilication solution, comprising the following steps: First, pretreatment of the desilication solution: the desilication solution is mixed with an oxyacid to adjust the pH to 9-11.5, a template agent is added and mixed evenly to obtain an initial gel; Second, preparation of the ZSM-5 molecular sieve: the initial gel obtained in the first step is placed in a microwave synthesizer for aging with high-speed stirring; the aged solution undergoes a crystallization reaction, followed by filtration, washing, drying, and high-temperature calcination to obtain the ZSM-5 molecular sieve. This invention uses desilication solution as a raw material to prepare ZSM-5 molecular sieves, saving material costs and providing a new approach for the high-value utilization of desilication solution. Furthermore, by utilizing microwave-assisted synthesis on the basis of the traditional hydrothermal method, the time cost is effectively shortened.

The present application relates to a molecular sieve composition, its preparation and application thereof. The molecular sieve composition comprises a molecular sieve having an embedded structure composed of a molecular sieve having a TON structure and a 5 A-type molecular sieve. The molecular sieve composition has dual functions of adsorption and hydroisomerization.

The application provides a preparation method of a composite molecular sieve and application of the composite molecular sieve in heavy oil cracking, and the preparation method comprises the following steps: dissolving an aluminum source, a silicon source and a structure directing agent in water, and then performing crystallization treatment to obtain a ZSM-5 crystal seed solution; etching Y type molecular sieve in water by using an alkaline substance to form a hollow structure, and then mixing the hollow Y type molecular sieve with acidic silica sol to obtain a solution containing the hollow Y type molecular sieve; mixing the ZSM-5 crystal seed solution and the solution containing the hollow Y type molecular sieve, and then performing temperature crystallization, and then separating a crystallization product, and then performing washing, drying and calcination to obtain a ZSM-5 / Y composite molecular sieve, and then performing ion exchange reaction, and then performing calcination to obtain a H type ZSM-5 / Y composite molecular sieve product. The composite molecular sieve synthesized by the application has the advantages of high activity, good selectivity and the like when the composite molecular sieve is prepared into a catalyst, high liquefied gas and propylene yield can be obtained, and the composite molecular sieve is particularly suitable for the field of petrochemical catalytic cracking.

This invention relates to the field of catalysts, and discloses a catalyst support and its preparation method, as well as a catalyst and its application. The catalyst support contains Y-zeolite, β-zeolite, alumina, and optionally amorphous silica-alumina. The Y-zeolite comprises micropores with a pore size less than 2 nm, mesopores with a pore size of 2-50 nm, and macropores with a pore size greater than 50 nm. Taking the total volume of micropores, mesopores, and macropores as 100%, the micropore volume accounts for less than 40%, the mesopore volume accounts for 20-80%, and the macropore volume accounts for less than 40%.

This invention discloses a method for preparing zeolite molecular sieves with precisely adjustable particle size, comprising the following steps: (1) adding aluminum source and other raw materials to deionized water and stirring evenly at room temperature; (2) adding silicon source, stirring at room temperature, and then adding template agent to obtain precursor slurry; (3) adding zeolite molecular sieve, the amount of zeolite molecular sieve being 1-15 mg / g of precursor slurry, transferring the precursor slurry to a high-pressure reactor, fixing it on a homogeneous reactor, heating to 0-150℃, maintaining for 1-200 h, and then heating to 160-230℃ for 3 hours to crystallize for 6-96 h; (4) obtaining zeolite molecular sieve after centrifugal washing, drying, and calcination. The innovation of the preparation method of this invention lies in the first use of a two-stage synthesis method, which can gradually reduce the particle size of the zeolite molecular sieve product while increasing the yield of zeolite molecular sieves. This method successfully synthesized SAPO-34 zeolite molecular sieve with a particle size deviation of less than 0.4 μm and ZSM-5 zeolite molecular sieve with a particle size deviation of less than 0.2 μm.