491results about "Aluminosilicate zeolite type-A" patented technology

The invention discloses a jprocess for improving viscosity of attapulgite clay which comprises the steps of modification treatment, batching, agitating, milling and detect. The process can be applied into the real processing procedure of Attapulgite clay, and can increase the viscosity of the end product by over 35%.

The invention relates to a preparation method for a molecular sieve, and aims to provide a method for synthesizing a zeolite molecular sieve via a solid phase method without an organic template. The method comprises the steps of grinding and mixing weighed solid raw materials of silicon source, aluminium source and alkali source; putting the above mixture in a reaction kettle; performing a crystallization reaction for 5 h-20 d at a temperature of 50-200 DEG C; suction-filtering a product, and drying the product to obtain various molecular sieve raw powder. A ZSM-5 zeolite molecular sieve, a Beta zeolite molecular sieve, an FAU zeolite molecular sieve, an MOR zeolite molecular sieve, an LTA zeolite molecular sieve an a GIS zeolite molecular sieve which have relatively good crystallinity and controllable silica-alumina ratio in a certain range can be obtained through the method. The product has good crystallinity and purity; no organic template and solvent is used in the whole production process; so that unnecessary loss in the production process can be prevented greatly. Besides, a conventional method is simplified greatly; and single-kettle yield is increased greatly.

The invention relates to a process for preparing nano A type molecular sieve, including 3A, 4A and 5A molecular sieves, wherein silicon source and aluminum source are selected according the mol ratio of silicon : aluminum = 2:1, and 3-7 mol/L NaOH solution is added by the proportion of total solid weight of silicon and aluminum source : NaOH = 1:5-12, the process comprises the steps of, adding NaOH solution into silicon and aluminum sources, carrying out ultrasonic and microwave combination treatment for 10-150 minutes, controlling the temperature between 90-100 deg. C, filtering, scouring till pH=7-10, post-treating to obtain the nano A type amolecular sieve.

Belonging to the field of molecular sieve synthesis, the invention relates to a method for preparing a 3A type zeolite molecular sieve. The preparation method of a 3A type zeolite molecular sieve is characterized by comprising the steps of: 1) calcination of kaolin, thus obtaining metakaolin; 2) preparation of a 4A molecular sieve: mixing metakaolin and a NaOH aqueous solution uniformly, thus obtaining a mixture; filtering the mixture, washing the filter cake with distilled water, and conducting filtration again, drying the filter cake from second filtration at a temperature of 90-100DEG C for 2-4h, thus obtaining the 4A molecular sieve; 3) preparation of a 3A type zeolite molecular sieve: reacting the 4A molecular sieve with a KCl solution in a reaction vessel for 3-5h at a temperature of 70-90DEG C, then conducting cooling, washing, and filtering, drying the obtained filter cake at a temperature of 90-100DEG C for 2-4h, thus obtaining the 3A type zeolite molecular sieve. The method of the invention has simple process and low calcination temperature, and the prepared 3A type zeolite molecular sieve has great calcium ion exchange capacity and good performances.

A process for preparing zeolite with multi-class pore canal structure by zeolitizing diatomite features use of laminating technique and gas-solid crystal conversion technique. For the laminating technique, an electrostatic attraction is used to assemble the nano zeolite onto diatomite. For the gas-solid crystal conversion technique, the amorphous SiO2 is converted to zeolite without damage to the form and structure of diatomite. Its advantages are simple operation, high speed, rich macropores, environmentally friendly process and wide application range.

The invention relates to a method for synthesizing a NaA molecular sieve membrane. A seed crystal coating mode of combining the coating and the dipping of seed crystal is used for the synthesis of the molecular sieve membrane. Firstly, a supporting body is polished by sand paper and is dried; a seed crystal paste is coated on the surface of the supporting body to remove the possible defects on the surface of the supporting body; secondly, the seed crystal is precoated by a lifting and dipping method; and finally the NaA molecular sieve membrane is synthesized by a hydrothermal synthesis method. The NaA molecular sieve membrane synthesized by the method has continuous and compact surface, excellent separation performance and good repeatability and is suitable for scale preparation.

The invention discloses a method for synthesizing pure 4A zeolite, P-shaped zeolite and sodalite with concavo-convex attapulgite clay. The method is characterized by comprising the following steps: firstly, the concavo-convex attapulgite clay is calcined in high temperature; then, the calcined concavo-convex attapulgite clay is soaked by soda liquor to obtain leach liquor containing Na2SiO3; finally, an aluminum source is added into the soda leach liquor to carry out hydrothermal crystallization synthesis, and then, the pure 4A zeolite, the P-shaped zeolite and the sodalite are respectively obtained by filtration, rinsing and drying. In the method, the concavo-convex attapulgite clay is used as raw material, and the genuine 4A zeolite, the P-shaped zeolite and the sodalite are respectively obtained by calcination and soda-leach pretreatment through adjusting synthesis conditions, therefore the invention has the advantages of simple synthesis method, easily obtained raw material and low production cost.

The invention discloses a process method for producing fluorine compounds and silicon compounds by cleanly utilizing fluosilicic acid. The process method comprises the following steps of: preparing fluosilicic acid as a phosphorus chemical by-product into an anhydrous aluminum fluoride product, a sodium fluoride product and a cryolite product, and combining with other industrial waste silicon slags and aluminum slags to prepare a 4A zeolite product. The process method comprehensively utilizes the fluosilicic acid and has high resource recovery rate, wherein the recovery rate of the fluorine element reaches higher than 90 percent. Waste silicon dioxide slags generated in the process can be recycled to produce white carbon black and the 4A zeolite, and a mother liquor, a cleaning solution and waste gas which are generated in the production process are all recycled, thereby the environmental pollution is reduced, and the purposes of zero emission and no pollution are truly achieved, thus the method completely meets the requirement for clean production. The invention has the advantages of advanced production process, good product quality and high value, wherein the fluorine content of the aluminum fluoride is high and between 63-65 percent; the quality index of the obtained white carbon black meets the requirement on the standard of the chemical industry; and the quality of the 4A zeolite product meets the requirements on the national standard and the standard of European and American developed countries.

The invention discloses a method for synthesizing a monolithic 4A molecular sieve by a dry glue process, relating to the technical field of molecular sieve synthesis. The method comprises the following steps: evenly mixing an alkali source, an aluminum source, a silicon source and water in a mole ratio of (0.3-5) Na2O:Al2O3:(1.7-2.5) SiO2:(3-12) H2O to prepare preformed dry glue; aging the preformed dry glue at room temperature for 0.5-30 hours, putting in a reaction kettle with a water jacket barrier, and crystallizing at 75-110 DEG C for 0.5-30 hours, wherein the mass ratio of the water to the preformed dry glue in the reaction kettle in the crystallization process is 0.05:(1-1.1); and washing the crystallization product, and drying to obtain the monolithic 4A molecular sieve. The monolithic 4A molecular sieve has favorable strength, does not need reforming, and can be directly used as an adsorbent or catalyst support. The method is capable of simplifying the traditional technical process, enhancing the synthesis efficiency and raw material utilization ratio and lowering the synthesis cost, and has the advantages of no mother solution discharge and environment friendliness.

A high-performance water-permeable osmosis-evaporation membrane is prepared through preparing a NaA-type molecular sieve membrane on the porous tubular ceramic substrate by hydrothermal synthetic reaction. Its raw materials are Na2O, Al2O3, SiO2 and H2O. Said Na-A-type molecular sieve membrane has excellent separation performance.

This invention relates to a method for preparing 4A zeolite with kaoline as the raw material aiming at providing a preparation method for composite 4A zeolite with kaoline as the raw material against the shortcomings of the present chemosynthesis method, acidified bentonite method and a kaoline high temperature calcining method including the following steps: mixing uniformly kaolin and NaOH in a certain proportion and heating them for 1-3h, adding a certain volume of active Al2O3, active SiO2 and water in the activated product to be thermal-crystalized for 0.5-4h under 80-95deg.C then to filter the product and dry it to get the 4A zeolite product.

A process for preparing A-type zeolite from coal gangue includes high-temp fusing of coal gangue in alkali flux, adding water and crystallizing. In the process, the Na2O/SiO2, SiO2/Al2O3 and H2O/Na2O are respectively controlled to be (1-3), (1-3.5) and (30-150). Its advantages are full activation of all active Si and Al components in coal gangue, high crystallinity and high purity.

The invention discloses a method for synthesizing 4A molecular sieve by adopting the fly ash in alkaline dissolving method; the fly ash with Al2O3 being more than or equal to 36 percent (36 percent to 46 percent), and the mol ratio of the SiO2/Al2O3 being 1.8 to 2.1 is used to be mixed with alkali according to the mol ratio of Na2O/Al2O3 is 3 to 10, and to be milled and well distributed; the mixed material with the height of each layer being 4 to 8 cm is arranged inside a high-temperature furnace at the temperature of 550 to 800 DEG C to be calcined and activated for 1 to 3 hours. After being dissolved by the water, the mol ratio of H2O/Na2O is controlled to be 30 to 60, and is mixed at the temperature of 50 to 80 DEG C for 1 to 3 hours, and is colloidized, and then is heated to the temperature of 100 plus or minus 10 DEG C to be held quietly for the crystallization for 4 to 6 hours; after the reaction, the material is filtered, and is washed until the pH value is equal to 9 to 11, and is dried to get the 4A molecular sieve. The molecular sieve is white, the calcium exchanging quantity is more than or equal to 310 mg of CaCo3/g; and the sieving rate is more than or equal to 90 percent. The invention can integrally use the fly ash of the waste pollutant, and has the advantages of high utilization rate, simple process flow procedures, environmental protection, and the like.

A method for producing a 4A molecular sieve comprises the following steps: (a) an intermediate product sodium silicate solution or a product carbon white obtained in the process of extracting silicon dioxide by a fly ash alkali solution method, (b) an intermediate product sodium aluminate solution or products aluminum hydroxide and aluminum oxide obtained in the process of extracting aluminum oxide by a fly ash soda lime sintering method, (c) NaOH and (d). H2O are taken as raw materials which meet the following mol ratios: Na2O:SiO2=1.6-3.8:1 and SiO2:Al2O3=1.7-2.1:1, and water added is controlled at the mol ratio of H2O:Na2O=30-60:1; and the raw materials are evenly mixed, stirred and gelled at 50-80 DEG C, heated to 90-120 DEG C, kept standing and crystallized for 3-6 hours, filtered, washed and dried to obtain the 4A molecular sieve. The calcium exchange capacity of the produced 4A molecular sieve is not less than 310mgCaCO3/g, and the sieving rate of a 1.25mm sieve is not lower than 90%.

The present invention discloses one kind of zeolite molecular sieve and its preparation process with palygorskite as material. The zeolite molecular sieve is prepared through reacting palygorskite and alkali solution in 5-20 times, and the subsequent washing and drying. The prepared zeolite molecular sieve has type controlled through altering the ratio between palygorskite and alkali solution. The process of preparing zeolite molecular sieve with palygorskite as material is simple.

A process for synthesizing A-type molecular sieve membrane by the vacuumizing and coating crystals method includes such steps as introducing a layer of uniform crystal seeds to the surface of base membrane by vacuumizing or compressing method, and synthesizing A-type molecular sieve membrane by hydrothermal synthesis and microwave synthesis, where the used solution contains Na2O, Al2O3, SiO2 and H2O. The resulting molecular sieve membrane features high separation performance and high repeatability.

The invention discloses a preparation method of a porous 5A molecular sieve for straight-chain alkane adsorption and belongs to the technical field of molecular sieve adsorbents. The preparation method comprises the following steps of adding ethyl orthosilicate into a sodium hydroxide aqueous solution, carrying out stirring for some time, fully dissolving sodium metaaluminate in water, fast mixing the two solutions, carrying out violent stirring to obtain milky colloid, carrying out crystallization on the colloid at a temperature of 80-95 DEG C for 4-6h, carrying out cooling, carrying out filtration, carrying out washing until a pH value is less than 9, carrying out drying by an oven to obtain 4A molecular sieve raw powder, carrying out ion exchange on the 4A molecular sieve raw powder and a calcium chloride solution to obtain the 5A molecular sieve. The 5A molecular sieve has n-decane static saturated adsorption capacity of 0.538g/g and n-pentdecne static saturated adsorption capacity of 0.647g/g. The 5A molecular sieve is prepared from an organic silicon source ethyl orthosilicate replacing an inorganic silicon source sodium silicate so that the channels of the 5A molecular sieve have diversity. The 5A molecular sieve has a good saturation adsorption amount of straight-chain alkanes.

The invention discloses a method for preparing a 4A zeolite molecular sieve desiccant with high crystallinity through a raw material of common natural kaolin. The method comprises the following steps: taking kaolin as the raw material, roasting the kaolin by a direct roasting method or a dry-process alkali roasting method, colloidizing, crystallizing, and suction filtrating and cleaning the kaolin through deionized water, and then drying the kaolin; and adding clay mineral bentonite or kaolin crude ore into the kaolin for granulation, and then obtaining the 4A zeolite molecular sieve desiccant after roasting. The method has the advantages that the method has a simple preparation process, raw material available, and loose operating conditions; and the synthesized 4A zeolite molecular sieve has the characteristics of high crystallinity, small particle size, good dispersibility, and high static water adsorption rate and high strength against crushing. The static water adsorption rate of the desiccant reaches 21.5 weight percent, and the strength against crushing reaches 62.1N/particle. The indexes reach the standards of the Department of Chemical Industry.

The invention discloses a method for producing a molecular sieve in a horizontal reaction vessel. The horizontal reaction vessel of the invention is used for hydrothermal method or sol-gel method and method for composing the molecular sieve relating to liquid and solid mixed system which can be used for composing all microporous molecular sieves, mesopore molecular sieves and microporous-mesopore composite molecular sieves. The invention overcomes the defects of bad mixing effect of the liquid and the solid in compositing the molecular sieve in a vertical reaction vessel and difficulty in controlling pore canal structure, grain diameter and distribution of the product thereof.

The invention mainly discloses a method for preparing a NaA molecular sieve from a geopolymer. The method comprises the following steps: with metakaolin or chemically-synthesized aluminum silicate active powder as a solid raw material and sodium potassium silicate or sodium hydroxide solution as an exciting agent, adjusting the ratio of silicon to aluminum in a system by using boehmite; mixing the solid raw material with the alkali exciting agent according to the ratio of silicon to aluminum and the ratio of sodium to aluminum in the raw materials in the composition design of the NaA molecular sieve; stirring the solid raw material and the alkali exciting agent and injecting the mixture into a die; carrying out sealed curing the mixture in a thermostat at the temperature of 60-80 DEG C for 6-24 hours; feeding the cured geopolymer sample into a hydrothermal reactor; and carrying out hydrothermal crystallization on the cured geopolymer sample at the crystallization temperature of 70-110 DEG C for 4-10 hours to obtain the NaA molecular sieve. According to the method disclosed by the invention, due to the utilization of the characteristic that the geopolymer is easily formed, a NaA molecular sieve blocky material can be prepared in situ at one time. Compared with the preparation method for the NaA molecular sieve, the prepared method disclosed by the invention has the advantages of simplicity in operation, low cost and suitability for scale preparation.

The invention relates to a high-intensity molecular sieve and a preparation method thereof. The method comprises the following steps: uniformly mixing molecular sieve material and a binder so as to obtain molecular sieve quality A; adding structure intensifier into the molecular sieve quality A so as to obtain molecular sieve quality B, and then obtaining the high-intensity molecular sieve through forming, drying, roasting and cooling the molecular sieve quality B in sequence. The molecular sieve prepared by using the method provided by the invention not only has excellent mechanical strengthand also is low in abrasion ratio.

The invention discloses a method for synthesizing a NaA-type molecular sieve membrane on an inner wall of a support body. The method adopts a way of adding an adhesive to coat seed crystal to synthesize the molecular sieve membrane. Clear liquid, composition of which is similar to that of synthetic liquid for synthesizing the molecular sieve membrane, is prepared to serve as the adhesive, and then the clear liquid is mixed with molecular sieve crystal suspension in certain proportion to prepare seed crystal liquid; the support body is immersed into the seed crystal liquid; the support body is dried after being dipped so as to obtain the support body with the seed crystal; and finally, the molecular sieve membrane is synthesized by a dynamic hydrothermal synthesis method. According to the invention, prepared seed crystal layers are distributed uniformly, the surface of the synthesized molecular sieve membrane is continuous and dense, and the synthesized molecular sieve membrane has an excellent separating property, is good in repeatability and is suitable for large-scale production.

The invention discloses a method for preparing a molecular sieve. The method comprises the following steps: preparing a molecular sieve gel, and crystallizing the molecular sieve gel under a gamma rayradiation condition to obtain the molecular sieve. The method greatly shortens the crystallization time of the synthesized molecular sieve and greatly improves the relative crystallinity of the molecular sieve.

The invention relates to a method for synthesizing a 4A-type molecular sieve by utilizing aluminum-silicon tailings obtained in the process of carrying out potassium extraction on potassium feldspar. The method comprises the following steps: uniformly mixing the residual aluminum-silicon tailings obtained in the process of carrying out potassium extraction on potassium feldspar and 2 to 5mol/L of NaOH solution according to a certain ratio and stirring for 1 to 3 hours under the condition of a temperature of 24 DEG C to 26 DEG C; then carrying out hydrothermal crystallization on the mixed materials for 3 to 6 hours under the condition of a temperature of 90 to 100 DEG C and filtering after the crystallization reaction is finished; washing a filter cake to the pH value of 9 to 10 by distilled water; and drying to obtain the 4A-type molecular sieve. According to the invention, the residual aluminum-silicon tailings obtained in the process of carrying out potassium extraction on potassium feldspar replaces conventional chemical raw materials and the raw material cost is obviously reduced; the synthesis process is simple; the synthesized 4A-type molecular sieve has calcium ion exchange capacity of over 310mg; and the CaCO3/g anhydrous 4A-type molecular sieve accords with the requirements of the 4A-type molecular sieve for a detergent, which are regulated by the light industry standard QB/T1768-2003. An effective approach is provided for efficiently and comprehensively utilizing the potassium feldspar resources by the process.