148results about "Aluminosilicate zeolite type-A" patented technology

The invention discloses a self-forming A-type molecular sieve foam material taking rectorite as a raw material as well as a preparation method and application thereof, and belongs to the field of green synthesis of molecular sieve foam materials. The preparation method comprises the following steps: 1) grinding and sieving rectorite to obtain rectorite powder, and calcining at 950-1000 DEG C for 2-4 hours to prepare activated rectorite powder as a solid-phase raw material; and 2) mixing the solid-phase raw material and an alkaline activator according to a mass ratio of (0.82-1.13): 1, fully and uniformly stirring, adding a seed crystal inducer, then adding a foaming agent, uniformly stirring, pouring into a mold, sealing, and crystallizing to obtain the self-forming A-type molecular sieve foam material. According to the invention, only the natural mineral rectorite is utilized, no chemical reagent is added as a silicon-aluminum source, the self-forming A-type molecular sieve foam without a binder is obtained, and when the foam is used as an adsorbent, the problems of pore channel blockage, molecular sieve effective site dilution, guest molecule transmission limitation and the like can be effectively avoided.

The invention discloses a solvent-free solid-phase synthesis method of a molecular sieve, which comprises the following steps: putting a solid-phase mixed raw material containing a molecular sieve raw material and a grinding material into a closed container, rotating and heating, and synthesizing to obtain the molecular sieve. The method is a novel technology for forming crystals through self-assembly of molecules in a solution under the assistance of mechanical force, the grinding material provides additional mechanical force for molecular sieve raw materials in the synthesis process, and no solvent is used or the use of the solvent is greatly reduced in the synthesis process. And the molecular sieve material with high quality, high crystallization degree and high specific surface area can be prepared in a relatively short time.

The invention provides a method for synergistically preparing calcium fluoride and a molecular sieve based on multi-element industrial waste, and belongs to the technical field of industrial waste recycling. The method comprises the following steps: respectively taking an electrolytic aluminum industry byproduct fluorine-containing waste electrolyte cryolite and lithium slag after lithium extraction of lithium ore as raw materials, performing acid leaching on the electrolyte cryolite, adding a calcium compound, separating to obtain calcium fluoride solid and a mixed solution containing aluminum chloride and sodium chloride, and adding an alkaline solution into the mixed solution to obtain an aluminum hydroxide product. And carrying out alkaline leaching on the lithium slag to obtain a mixed solution containing sodium silicate and sodium metaaluminate, and proportionally synthesizing the mixed solution with the obtained aluminum hydroxide and sodium hydroxide solution to obtain the 4A zeolite molecular sieve product. The calcium fluoride and the zeolite molecular sieve are cooperatively prepared by adopting multi-element industrial waste, and the problems that electrolyte cryolite cannot be completely applied to the aluminum electrolysis process, the lithium slag treatment cost is high and the like in the prior art are solved.

The invention belongs to the technical field of molecular sieves, and particularly relates to a preparation method and application of a hydrophobic modified molecular sieve. The preparation method of the hydrophobic modified molecular sieve comprises the following steps: (1) activating a molecular sieve to obtain a pre-activated molecular sieve; and (2) mixing the pre-activated molecular sieve, a silane coupling agent and a solvent for reaction to obtain the hydrophobic modified molecular sieve. The hydrophobic modified molecular sieve has the beneficial effects that the pore channel structure of the hydrophobic modified molecular sieve and the pore channel structure of the molecular sieve before modification are not greatly changed, the good pore channel property of the molecular sieve is maintained, and the moisture interference resistance of the molecular sieve during carbon dioxide adsorption is improved. The molecular sieve hydrophobic modification method is simple and convenient to operate, low in cost and suitable for large-scale production.

The invention relates to the field of molecular sieves, and discloses a modified and reinforced molecular sieve and application thereof in hydrocarbon dehydration, the modified and reinforced molecular sieve is obtained by mixing 4A molecular sieve raw powder, modified lamb liver soil and deionized water into spheres, calcining the spheres in a muffle furnace, crystallizing the spheres by using a sodium hydroxide solution, and then replacing the spheres by using a potassium chloride solution, the mass ratio of the 4A molecular sieve raw powder to the modified lamb liver soil to the deionized water is (5.5-6): 1: (1.2-1.6), the modified lamb liver soil is prepared by calcining lamb liver soil by using a muffle furnace and performing acid leaching for pretreatment, then performing amination modification by using gamma-aminopropyltriethoxysilane, and further performing in-situ growth of silicon dioxide nanoparticles on the surface of the aminated lamb liver soil through electrostatic assembly. The modified enhanced molecular sieve is prepared through balling, firing, crystallization in the alkaline environment and potassium chloride replacement, so that the static adsorption capacity of the modified enhanced molecular sieve is increased to about 24%, and the modified enhanced molecular sieve has better application in hydrocarbon dehydration.

The invention relates to the technical field of 4A zeolite production, and discloses a method for producing 4A zeolite by using coal gasification slag, which comprises the following steps: carrying out roasting process, conversion process, refining process, primary extraction process, dissolution process, secondary extraction process, mold adjustment, slurrying, crystallization and drying on the coal gasification slag to obtain the 4A zeolite. The coal gasification slag is used as a raw material, aluminum oxide and silicon dioxide in the coal gasification slag can be fully extracted through the method, the yield of the 4A zeolite is increased, and the obtained 4A zeolite has the advantages of being high in crystallinity and whiteness, low in impurity content, large in cation exchange capacity and the like.

The invention discloses a molecular sieve for adsorbing and separating ethylene and ethane as well as a preparation method and a use method thereof, and belongs to the field of gas adsorption and separation, the molecular sieve is a molecular sieve with LTA configuration, the preparation method comprises the following steps: drying and calcining an ion exchange product of silver salt and LTA molecular sieve, and component cations of the molecular sieve at least comprise Na < + > ions and Ag < + > ions; according to the method, the content of Ag is effectively controlled, the problem that the selectivity of an existing adsorbent for separating C2H4 / C2H6 is not ideal is solved, and a feasible technical route is provided for effective recycling of high-added-value products.

The invention provides a method for recovering fluorine resources by using fluorine-containing silicon powder and synthesizing an A-type molecular sieve, which comprises the following steps: A) mixing the fluorine-containing silicon powder with a sodium hydroxide solution, and heating for reaction to obtain a clear solution and a precipitate sodium fluoride; silicon and sodium in the settled solution are metered by SiO2 and Na2O, and the molar ratio of SiO2 to Na2O is 1.9-2.4; b) mixing sodium aluminate with a sodium hydroxide solution to obtain an alkaline solution of the sodium aluminate, mixing the settled solution in the step A) with the alkaline solution of the sodium aluminate, and stirring to obtain a gel solution; and C) heating and crystallizing the gel solution to obtain the A-type molecular sieve. The removal of organic impurities in the fluorine-containing silicon powder, the efficient separation of fluorine and silicon and the synthesis of the 4A molecular sieve with high purity and few crystal defects are completed through the preparation of low-modulus sodium silicate, filtration and separation and the removal of a small amount of residual fluorine in sodium silicate gel.

The application relates to the technical field of explosion suppression agent preparation, in particular to a novel inorganic low-silicon-aluminum-ratio explosion suppression material and a preparation method thereof.The steps of the preparation method comprise the following steps: placing dried molecular sieves in an alkali solution, placing the molecular sieves in a magnetic stirrer and stirring intensively, centrifugally separating the stirred sample, washing the sample with deionized water until neutral, drying the sample in a blast drying oven at 120 DEG C for 24 h, grinding the sample in a mortar for 10 min, and sieving to obtain explosion suppression powder.The prepared inorganic low-silicon-aluminum-ratio explosion suppression material has the advantages of high efficiency, low cost, non-toxicity and harmlessness, and can be used for industrial production and applied to the field of methane explosion suppression.

A utilization method of FAU molecular sieve crystallization mother liquor, characterized in that, comprising: uniformly mixing FAU molecular sieve mother liquor, silicon source, inorganic alkali, water and aluminum source to obtain a type molecular sieve synthesis system mixture with a molar ratio of SiO2 / Al2O3=1.85-1.99, Na2O / SiO2=1.0-1.6, H2O / SiO2=45-65; aging and hydrothermal crystallization are performed on the mixture, and the product is recovered to obtain a type molecular sieve and a type molecular sieve filtration mother liquor; or further uniformly mixing the type molecular sieve filtration mother liquor and an aluminum-containing compound, stirring at 160-200 DEG C for 2-8 hours to obtain a recycled aluminum source with a SiO2 content of 50-300 ppm; uniformly mixing silicon source, inorganic alkali, recycled aluminum source and water to obtain a FAU molecular sieve synthesis system mixture, aging and hydrothermal crystallization are performed on the mixture, and the product is recovered to obtain a FAU molecular sieve and a FAU molecular sieve crystallization mother liquor. The method can not only completely recycle the FAU molecular sieve mother liquor, avoid waste water discharge, reduce the consumption of inorganic alkali and deionized water, and significantly reduce the production cost, but also can be flexibly used for preparing FAU molecular sieve and / or a type molecular sieve.

The present invention relates to a method for the preparation of monoliths of zeolite A, allowing the 3D printing of zeolite precursor gels, the product crystallization taking place contemporary to the component solidification, and to form monolithic objects with optimized designs in terms of the properties required for each application.

The present invention provides a process for producing a zeolite from an acid resistant mineral composition, the process comprising: (a) treating an acid resistant mineral composition comprising an aluminosilicate with an alkaline solution to dissolve silicon in the aluminosilicate into the alkaline solution, thereby producing an alkaline silicate solution and an aluminiferous mineral residue; (b) separating the alkaline silicate solution from the aluminum-containing mineral residues; (c) contacting the aluminum-containing mineral residue with an acid solution to dissolve aluminum in the aluminum-containing mineral residue into the acid solution to produce an aluminum salt solution and an aluminum-poor solid residue; (d) separating the aluminum salt solution from the aluminum-poor solid residues; (e) combining at least part of the alkaline silicate solution and at least part of the aluminum salt solution to form a zeolite precursor solution; and (f) precipitating the zeolite from the zeolite precursor solution.

To provide a membrane reactor capable of improving yield of a target product by progressing efficiently a catalyst reaction, in a reaction controlled by chemical equilibrium.SOLUTION: Concerning a membrane reactor for performing a reaction controlled by chemical equilibrium, the membrane reactor has a separation membrane for selectively and continuously separating, from reaction liquid, a by-product generated by the reaction. By selectively and continuously separating the by-product from the reaction liquid, the chemical equilibrium is shifted and the reaction is furthermore progressed.SELECTED DRAWING: None

The invention provides a surface wear-resistant molecular sieve as well as a preparation method and application thereof, and relates to the technical field of molecular sieves. The preparation method comprises the following steps: mixing A-type molecular sieve raw powder, a first binder, a reinforcing agent and water, and molding to obtain an intermediate product to be subjected to surface finishing; the intermediate product to be subjected to surface finishing is sequentially subjected to surface pre-wetting and surface finishing powder applying, and a surface finishing intermediate product is obtained after curing; and sequentially drying and roasting the surface-finished intermediate product to obtain the surface wear-resistant molecular sieve. The molecular sieve prepared in the invention has excellent wear resistance and low surface dust content, is a high surface wear resistance type molecular sieve, and has static water adsorption capacity (25 DEG C, RH75%) of more than 18%, surface dust of less than or equal to 40ppm, and wet wear of less than or equal to 1.0%.

A high-purity artificial zeolite is industrially mass produced by carrying out osmosis treatment of fly ash in an alkaline aqueous solution, subsequently carrying out the osmosis treatment again with an acidic aqueous solution of pH 1.0 or less obtained by adding acid to the osmotic aqueous solution of fly ash, then performing solid-liquid separation while water wash and dewatering in a centrifuge, thereby synthesizing a starting composition, and performing hydrothermal reaction treatment to this starting composition.

The application discloses a self-forming A-type molecular sieve foam material taking attapulgite as raw material and a preparation method and application thereof, and belongs to the field of green synthesis of molecular sieve foam materials. The steps are as follows: 1) grinding and sieving attapulgite to obtain attapulgite powder, and then calcining the attapulgite powder at 950-1000 DEG C for 2-4 hours to prepare activated attapulgite powder as a solid-phase raw material; 2) mixing the solid-phase raw material with an alkaline activator according to a mass ratio of 0.82-1.13:1, fully stirring and uniformly mixing, adding a seed crystal inducer, then adding a foaming agent, uniformly stirring, pouring into a mold, sealing, crystallizing, and obtaining the self-forming A-type molecular sieve foam material. The application only uses natural mineral attapulgite, does not add any chemical reagent as a silicon-aluminum source, obtains the self-forming A-type molecular sieve foam without a binder, and can effectively avoid problems such as pore blockage, dilution of effective molecular sieve sites and limitation of guest molecule transmission when used as an adsorbent.

The invention provides a molecular sieve and a preparation method thereof, and a preparation method and application of a molecular sieve drying agent, and belongs to the technical field of molecular sieves. The invention provides a molecular sieve preparation method, which comprises: mixing 3A molecular sieve raw powder, a first soluble divalent metal salt, a second soluble divalent metal salt and water, and carrying out ion exchange to obtain the molecular sieve, metal elements in the first soluble divalent metal salt and the second soluble divalent metal salt are independently one of second main group metal elements and are different; in the molecular sieve, the molar ratio of the total amount of substance of metal elements in the first soluble divalent metal salt and metal elements in the second soluble divalent metal salt to Al2O3 is (0.16-0.29): 1, and the molar ratio of K2O / Al2O3 is (0.20-0.40): 1.

The invention discloses a C3H8-SCR (selective catalytic reduction) catalyst as well as a preparation method and application thereof. The C3H8-SCR catalyst is a Cu-LTA silicon aluminum molecular sieve. The preparation method of the C3H8-SCR catalyst comprises the following steps: adding an acidity regulator into a copper salt solution until the copper salt solution is weak acid, then immersing an LTA silicon-aluminum molecular sieve, drying, and roasting under inert shielding gas to obtain the C3H8-SCR catalyst. The C3H8-SCR catalyst provided by the invention can be used for inhibiting propane from being directly oxidized by oxygen in a catalytic denitration reaction, reducing by-products, widening a temperature window of the denitration reaction, and ensuring higher denitration conversion rate and selectivity when the reaction is carried out at a wider reaction temperature.

This invention discloses a kinetically controlled method for preparing hierarchical porous molecular sieves, belonging to the field of catalyst preparation technology. It employs a two-step crystallization method: first, nucleation occurs at low and ultra-low H2O / SiO2 molar ratios; then, after the low-temperature phase, water is added, followed by rapid growth at high temperature and high H2O / SiO2 molar ratios. The solid-phase and liquid-phase crystallization mechanisms in the synthesis system work in succession to prepare hierarchical molecular sieves. This invention, without adding any mesoporous pore-forming agents, only modulates the crystallization temperature and the H2O / SiO2 molar ratio of the synthesis system to kinetically control the crystallization mechanism, resulting in molecular sieves with higher catalytic performance than those obtained using traditional methods. Furthermore, it overcomes the drawbacks of traditional hierarchical porous molecular sieve preparation processes, such as high cost, high calcination energy consumption, poor mesopore connectivity, and severe contamination from pore-forming agents.

Disclosed is a magnetic composite material, comprising a porous carrier the chemical formula of which is Na2Al2Si2O8·nH2O, and SmCo5 particles and Fe3O4 particles present within the pores of the porous carrier, n≥0. The mass percentages of SmCo5:Fe3O4:the porous carrier are 0.5-10%:30-50%:50-70%. The pore diameters of the pores are 0.35-0.45 nm. Further disclosed is a preparation method for the magnetic composite material. The magnetic composite material prepared according to the present invention has strong magnetism, and after ammonia nitrogen in wastewater is adsorbed, the magnetic composite material can be cyclically utilized due to the recyclability and regenerability thereof, so that material costs during wastewater treatment are greatly reduced, achieving the purpose of reducing wastewater treatment costs.

The present application relates to the technical field of molecular sieve materials, and in particular to a method for synthesizing zeolite molecular sieves using economical raw materials; the method comprises: mixing high-silicon waste liquid and low-alumina concentration waste liquid, and performing a hydrothermal reaction to obtain a gel; solid-liquid separation of the gel to obtain a gel filter cake; adding a regulator to the gel filter cake, stirring the mixture, and then adding a seed crystal directing agent to perform a crystallization reaction, and performing separation, washing and drying to obtain a zeolite molecular sieve; wherein the volume ratio of the high-silicon waste liquid to the low-alumina concentration waste liquid is 1 to 3:1; the silicon oxide concentration of the high-silicon waste liquid is greater than 1 g / L, and the aluminum oxide concentration of the low-alumina concentration waste liquid is 5 g / L to 30 g / L; the method realizes the deep utilization of silicon in the high-silicon waste liquid and aluminum oxide in the low-alumina waste liquid, thereby significantly reducing the circulation amount of silicon and aluminum oxide in the alumina production process, thereby reducing the production cost of zeolite.

Disclosed herein is a method to produce zeolite A comprising forming a slurry of a blend of coal combustion products or a leached residue thereof with metakaolin and aqueous alkaline solution; and maintaining the slurry at a temperature below the boiling point of the aqueous alkaline solution at atmospheric pressure for a time sufficient to dissolve aluminate and silica species into solution and precipitating zeolite A from the dissolved aluminate and silica species.

This invention provides a method for preparing a sound-absorbing composite material, comprising: Step 1: cleaning a support layer to remove surface contaminants; Step 2: forming a molecular sieve seed layer or a molecular sieve transition layer on the surface of the cleaned support layer, or sequentially forming a molecular sieve seed layer and a molecular sieve transition layer; Step 3: placing the product obtained in Step 2 in the growth solution of a third molecular sieve, followed by crystallization, drying, and calcination (with or without calcination) to form a molecular sieve outer layer. Compared with the prior art, the method for preparing the sound-absorbing composite material provided by this invention does not add a binder, but instead directly deposits a film on the inner wall of the rear cavity material of the loudspeaker, i.e., the support layer, through in-situ molding. The bond between the molecular sieve outer layer and the support layer is stronger, and the performance of the molecular sieve can be more fully and effectively utilized.

The invention discloses a method for converting quartz and mica impurities in sandy kaolin and synthesizing 4A zeolite, which comprises the following steps: uniformly mixing the sandy kaolin, sodium carbonate and aluminum hydroxide, wrapping with carbon paper, and heating in an ultrafast high-temperature furnace at 1100-1400 DEG C for 20 seconds to obtain a precursor; grinding the precursor into fine powder, and adding a proper amount of 0.01 mol / L NaOH solution to obtain a colloidal product; stirring the colloidal product at 80 DEG C for 4 hours, transferring the colloidal product to a reaction kettle, putting the reaction kettle into a drying oven, and performing hydrothermal treatment at 80-100 DEG C for 5-10 hours to obtain a crystallized product; and centrifuging the crystallized product at 5000 revolutions per minute for 1 minute, washing with distilled water for 3-4 times, and drying at 110 DEG C for 24 hours to obtain the 4A zeolite. According to the present invention, the precursor is rapidly generated under the action of sodium carbonate mainly for the sandy kaolin with characteristics of high quartz and mica impurity content, and the 4A zeolite with high purity can be synthesized after the hydrothermal treatment, such that the reaction energy consumption is reduced, the NaOH consumption is substantially reduced, and the green 4A zeolite synthesis method is superior to the traditional high temperature calcination method and the alkali fusion method in the green 4A zeolite synthesis aspect.

The present invention provides a heavy metal adsorbent comprising zeolite, wherein the median particle size of the zeolite based on volume is 10.0 μm or more, and the pore volume measured in the pore volume calculation range of 10 nm to 1000 nm by mercury intrusion porosimetry is 0.1000 cm 3 / g or less.

The invention provides an NH3-SCR catalyst and a preparation method and application thereof, the NH3-SCR catalyst comprises an LTA molecular sieve and active components loaded on the LTA molecular sieve, and the active components comprise Cu and rare earth metal elements. According to the invention, the LTA molecular sieve and the double active components composed of Cu and rare earth metal elements have a synergistic effect, so that the catalyst shows efficient NH3-SCR catalytic activity and excellent high-temperature hydrothermal stability, and when the catalyst is applied to an NH3-SCR reaction, 90% of NOx conversion rate can be maintained at 230-550 DEG C, and 90% of N2 selectivity can be maintained at the same time. The catalyst is used in the field of diesel vehicle tail gas denitration, can realize high-efficiency treatment of tail gas NOx, and accords with corresponding emission standard limits.

The present invention relates to the use of a C3-C6 alkene compound containing only one double bond in combination with at least one molecular sieve to limit or prevent the isomerization of trans-1-chloro-3,3,3-trifluoropropene to cis-1-chloro-3,3,3-trifluoropropene and / or to limit or prevent the decomposition of trans-1-chloro-3,3,3-trifluoropropene. The present invention also relates to methods for heating or cooling fluids or objects, methods for generating electricity, and heat transfer equipment. [Selection diagram] None

This invention discloses a tetrachloroaluminate-modified type A molecular sieve, its preparation method, and its application. The invention uses fly ash cenospheres as the main raw material to prepare a type A molecular sieve. Through modification with a mixture of fly ash and tetrachloroaluminate, it exhibits excellent adsorption performance for cobalt, cesium, and strontium ions. The type A molecular sieve prepared in this application has a good synergistic effect with tetrachloroaluminate, effectively solving the problems of complex processes, high costs, and poor adhesion of existing molecular sieve adsorbent preparation methods in the market. 137 Cs, 60 Co, 90 This method addresses the problem of low adsorption rates of major hazardous nuclides in radioactive wastewater such as Sr, and can be used to adsorb radionuclides in nuclear wastewater.

This invention belongs to the field of solid waste resource utilization and environmental protection technology, specifically relating to a type A zeolite adsorbent material based on ionic rare earth tailings and its preparation method. The invention involves sieving ionic rare earth tailings to obtain fine-grained particles rich in clay components, followed by heat treatment and alkaline solution crystallization to obtain type A zeolite. Then, thiol groups are grafted onto the zeolite surface using a silane coupling agent. Finally, an olefin compound containing terminal tert-butyl groups, phenolic hydroxyl groups, amino groups, Schiff bases, and a heptyl ring with a stereochemical structure is grafted onto the zeolite surface using a Michael addition reaction between thiol groups and double bonds. The phenolic hydroxyl, amino, and tert-butyl groups on the material surface form a good hydrophilic-hydrophobic structure, effectively improving the surface activity of the zeolite material, promoting the approach of heavy metal ions to the zeolite surface, and thus enhancing the adsorption effect of heavy metal ions.