56 results about "Zeolite membranes" patented technology

The invention provides an oriented ultrathin FER zeolite molecular sieve membrane as well as a preparation method and application thereof. The preparation method comprises the following steps: firstly, synthesizing a monodisperse FER zeolite nanosheet with a high length-depth ratio through a hydrothermal method; preparing a seed crystal liquid, and coating the surface of a porous carrier with the seed crystal liquid to form an oriented seed crystal layer; and carrying out hydrothermal epitaxial growth in a secondary growth solution. Through innovative design of seed crystal synthesis and epitaxial growth, the FER zeolite membrane prepared by the method has a structure with high alpha-axis preferred orientation, submicron controllable thickness, compactness and no defect. The membrane can be used for accurately screening gas molecules with small size difference by utilizing six-membered ring pore channels uniformly arranged along an a axis. When helium and methane or carbon dioxide are separated, the membrane shows permeation flux and separation selectivity far superior to those in the prior art, provides a brand new technical approach for efficient and low-energy-consumption recovery of helium and other high-value gases in the industry, and has great industrial application value.

The invention discloses a preparation method and application of an MFI zeolite membrane.The preparation method comprises the steps that an MFI zeolite nanosheet serves as a seed crystal, a uniformly-distributed and compact seed crystal layer is prepared on a carrier through a vacuum filtration method, namely, a nucleation center crystallized into a membrane is loaded on the surface of the carrier, and directional growth and membrane forming of the zeolite nanosheet can be effectively controlled; the highly b-oriented MFI zeolite membrane can be prepared within several hours, the prepared b-oriented MFI zeolite membrane shows a continuous and compact microstructure and almost has no defects, and compared with a traditional hydrothermal method, the method overcomes the defects that the reaction process is too long in time consumption, uneven in heating is prone to occurring, and the like. And therefore, the time required by crystal growth is greatly shortened. The prepared MFI zeolite membrane can be applied to pervaporation separation of xylene isomers, shows good size screening separation performance, and has important industrial application value.

A gas separation method includes supplying a mixed gas to a zeolite membrane complex and permeating a high permeability gas through the zeolite membrane complex to separate the high permeability gas from other gases. The mixed gas includes a high permeability gas and a trace gas that is lower in concentration than the high permeability gas. The molar concentration of a first gas included in the trace gas in the mixed gas is higher than the molar concentration of a second gas included in the trace gas in the mixed gas. The adsorption equilibrium constant of the first gas on the zeolite membrane is less than 60 times that of the high permeability gas. The adsorption equilibrium constant of the second gas on the zeolite membrane is 400 times or more that of the high permeability gas.

A gas separation method includes supplying a mixed gas to a zeolite membrane complex and permeating a high permeability gas through the zeolite membrane complex to separate the high permeability gas from other gases. The mixed gas includes a high permeability gas and a trace gas that is lower in concentration than the high permeability gas. The trace gas contains an organic substance whose molar concentration in the mixed gas is higher than or equal to 1.0 mol %. The adsorption equilibrium constant of the organic substance on the zeolite membrane is less than 150 times the adsorption equilibrium constant of the high permeability gas.

The utility model relates to an MTO (Methanol To Olefins) concentrated water treatment device, which comprises a circulating liquid phase hydrogenation unit and a dehydration unit, aldehyde and ketone components in MTO concentrated water are converted into mixed alcohol through circulating liquid phase hydrogenation, and most of water in the mixed alcohol is removed through flash evaporation degassing, azeotropic distillation and zeolite membrane dehydration treatment. According to the MTO concentrated water treatment device, a mixed alcohol product with low water content (about 2wt%) and waste water with low alcohol content (less than 0.2 wt%) are obtained, the technical index of the obtained mixed alcohol product is higher than the national standard of alcohol-based liquid fuel GB16663-1996, and ethanol, isopropanol and 2-butanol products can be obtained through further separation. The additional value is also improved, and the purposes of improving the quality and improving the efficiency are achieved.

A porous cylindrical support for use in supporting a zeolite membrane has a generally cylindrical inside surface having a central axis extending in the longitudinal direction and a generally cylindrical outside surface that surrounds the inside surface. A zeolite membrane is formed on the outside surface. A maximum value A and a minimum value B of a support thickness in a circumferential direction satisfy (A−B) / (A+B)≤0.3 in at least part of the support in the longitudinal direction, the support thickness being a radial distance between the inside surface and the outside surface. By reducing a variation in support thickness, it is possible to improve uniformity in the thickness of the zeolite membrane formed on the support.

The application provides a two-dimensional RUB-18 zeolite membrane and a preparation method and application thereof in gas separation, and belongs to the technical field of two-dimensional nanosheet membrane preparation and gas separation, and the preparation method of the two-dimensional RUB-18 zeolite membrane comprises the following steps: ball-milling stripping to obtain a two-dimensional RUB-18 zeolite nanosheet solution; and placing a porous substrate into the two-dimensional RUB-18 zeolite nanosheet solution to perform electrophoretic deposition. The application provides a mild method for preparing two-dimensional RUB-18 zeolite nanosheets by ball-milling stripping, and the two-dimensional RUB-18 zeolite membrane is prepared from the two-dimensional RUB-18 zeolite nanosheets, which is simple, efficient, low in cost, and a two-dimensional RUB-18 zeolite membrane with a thickness of 200-800 nm can be grown on the porous substrate in 5-50 minutes, and the two-dimensional RUB-18 zeolite membrane can be successfully used for gas separation, and the permeability and selectivity can be considered.

The present application relates to a kind of ultra-thin b orientation ZSM-5 zeolite molecular sieve membrane, preparation method and application in vanadium oxidation liquid flow battery, belong to liquid flow battery technical field. Low defect density, thin and [0k0] plane out orientation ZSM-5 zeolite separation membrane made of zeolite nanosheet realizes enhanced ion selectivity and ion conductivity, so as to improve battery performance. Therefore, VFB equipped with ZSM-5 zeolite membrane shows excellent vanadium resistance, self-discharge time reaches 116.2 hours, far more than Nafion 212 (45.9 hours). In addition, under 80mA cm ‑2 Current density, the performance of VFB remains stable in 1000 cycles.

The method for purifying propylene glycol methyl ether acetate from comprehensive waste solvent comprises the following steps: (1) ozone is introduced into the waste solvent, and EDTA-dinaesium calcium is added, and after reaction, the waste solvent is pumped into a multi-layer adsorption tower, and passes through an activated carbon layer, a hydrated zirconium oxide loaded resin layer, a weakly basic anion exchange resin and a molecular sieve layer; (2) acetic acid is added and pumped into a catalytic rectifying tower, a sulfonic acid solid catalyst is arranged in a catalytic section, and a crude product is taken out from a side line of a rectifying section; and (3) the crude product is sent into a double-membrane cascade system, is pumped from an intermediate tank to a PI-ZSM-5 hybrid membrane, is circulated back to the intermediate tank without passing through, is vaporized after passing through a permeate liquid, is sent to a DDR type zeolite membrane, and a vaporized retentate which does not pass through the DDR type zeolite membrane is collected, and a condensed liquid is obtained, and the main product is obtained. Compared with the existing multi-effect heat coupling rectification process, the method reduces energy consumption, and solves the problem of removal of high-boiling-point and near-boiling-point impurities; and for comprehensive waste solvent containing various impurities, the method can also realize efficient purification of propylene glycol methyl ether acetate, and the range of treatable impurity types is wide.

The invention discloses a rapid detection method for zeolite loading capacity and uniformity in a zeolite composite material, and particularly relates to the technical field of material performance detection. Performing fluorescence labeling treatment on the to-be-detected composite material sample; acquiring a fluorescence image under a specific excitation wavelength; constructing a three-dimensional light intensity distribution map through an image processing algorithm; establishing a nonlinear fitting relationship between the fluorescence intensity and the standard zeolite loading capacity by using a local weighted regression model; further estimating the overall zeolite loading capacity of the sample; meanwhile, based on fluorescence integration, distribution skewness and anisotropy analysis, calculating a zeolite distribution variation coefficient, and judging the distribution uniformity of the zeolite according to the zeolite distribution variation coefficient; the detection method has the advantages of rapidness, high sensitivity, non-destructiveness and the like, can realize automatic image recognition and quantitative evaluation, is suitable for zeolite distribution detection of various types of composite materials, and has a wide application prospect in preparation and quality control of materials such as catalysts, adsorbents, zeolite membranes and the like.

The invention discloses a method for separating and purifying hydrogen from ethylbenzene dehydrogenation tail gas by using an MOF (Metal Organic Framework) membrane separation device, which belongs to the technical field of advanced membrane separation, adopts a zeolite membrane, a polymeric membrane, a carbon membrane and an MOF membrane as membrane materials, can realize high purification of hydrogen in the tail gas, and comprises the following steps: pretreating the ethylbenzene dehydrogenation tail gas in a pretreatment unit; the pretreated raw materials are fed into MOF membrane separation equipment through a flow controller or a pump to be separated, a permeation component hydrogen is extracted from a permeation side by using a pump or N2 purging or differential pressure pushing, and a retentate side is connected with a back pressure valve to extract other impurity components of a retentate component. According to the method, efficient purification and recovery of hydrogen from ethylbenzene dehydrogenation tail gas are realized, the hydrogen production capacity can be remarkably increased, and the economic benefit is improved.

To provide a zeolite membrane composite having a high methanol gas / hydrogen gas permeance ratio, a method for producing the zeolite membrane composite, and a method for producing methanol using the zeolite membrane composite.SOLUTION: A zeolite membrane composite comprises a zeolite membrane on a porous support, where the ratio of the absorption intensity at 3590±10 cm-1 to the absorption intensity at 1865±10 cm-1 in Fourier transform infrared spectroscopy is 1.7 or more.SELECTED DRAWING: None

The present invention relates to an apparatus for making high protein paneer comprises of a zeolite chamber (4) operatively provided between a pasteurization tank (3) and a zeo-membrane (5) configured to weaken the bond of the molecules of lactose content, unwanted solids, dissolved impurities, colloidal and microbial particles by forceful conveying of pasteurized milk, and said zeo-membrane (5) to filters out said weakened bond molecules from the milk. This results in more than 24% yield of lactose and fat free paneer having more than 99% of protein content.

The present application relates to a kind of MTO concentrated water processing method, the processing device relied on includes circulating liquid phase hydrogenation unit and dehydration unit, and MTO concentrated water is converted into mixed alcohol by circulating liquid phase hydrogenation in aldehyde, ketone component in it, again by flash evaporation degassing, azeotropic rectification and zeolite membrane dehydration treatment, water in mixed alcohol is mostly removed, obtain low water content (about 2wt%) mixed alcohol product and low alcohol content (<0.2wt%) waste water, the technical index of obtained mixed alcohol product is higher than national standard "alcohol-based liquid fuel GB16663-1996", and further separation can obtain ethanol, isopropanol and 2-butanol product, the processing method of the present application not only solves the problem of MTO concentrated water processing, but also improves its added value, to the purpose of quality improvement and efficiency.

A gas separation apparatus includes a gas supply part and a zeolite membrane. The gas supply part supplies a mixed gas at a pressure greater than or equal to 10 atm and less than or equal to 200 atm. The mixed gas contains at least CH4, CO2, and N2. A water content of the mixed gas is made less than or equal to 3000 ppm. The zeolite membrane allows CO2 and N2 in the mixed gas to permeate therethrough, to thereby separate CO2 and N2 from CH4. The zeolite membrane is made of zeolite. The zeolite contains Al. A ratio of alkali metal to whole framework elements in the zeolite is less than or equal to 6.0 mol %. An amount of substance of the alkali metal in the zeolite is less than an amount of substance of Al.

The present application relates to the technical field of refrigerators, in particular to a lithium bromide absorption refrigerator combined with zeolite membrane technology and a refrigeration method, the refrigerant comprising an absorber, a membrane separation unit, a compression unit and an evaporator; the membrane separation unit is installed between the absorber and the compression unit, the feed side inlet of the membrane separation unit is connected with the dilute solution discharge port of the absorber, and the retentate side outlet is connected with the concentrated liquid inlet of the absorber; the permeation side outlet of the membrane separation unit is connected with the inlet of the compression unit, the liquefied water outlet of the compression unit is connected with the inlet of the evaporator, and the steam outlet of the evaporator is connected with the water vapor inlet of the absorber. The present application uses the normal temperature concentration technology of zeolite membrane, can omit the generator in the traditional lithium bromide absorption refrigerator, simultaneously reduces the heat exchange network, significantly improves the concentration efficiency of the lithium bromide refrigeration system, effectively reduces the energy consumption and the dependence on high temperature heat source, and reduces the traditional high temperature concentration.

To provide a method for producing refined gas which suppresses permeation of sweep gas from a permeation side to a non-permeation side, and can obtain a high-purity component as gas, even if the sweep gas is used, in mixed gas membrane separation.SOLUTION: There is provided a method for producing refined gas which is separated by supplying mixed gas containing carbon dioxide to a separation membrane, and permeating the carbon dioxide in the separation membrane, wherein the separation membrane is a zeolite membrane, and the permeation side of the separation membrane is swept by nitrogen or air.SELECTED DRAWING: Figure 1

The application provides a preparation method of a fluorine-free hydrophobic modified W-MEL or W-MFI zeolite molecular sieve membrane for oil-water separation, i.e. an in-situ crystallization method for preparing W-MEL and W-MFI type zeolite molecular sieve membranes. The method first pretreats a carrier with 3-aminopropyl triethoxysilane, then places the carrier in a reaction kettle, and performs high-temperature crystallization in a synthesis liquid to obtain W-MEL and W-MFI zeolite molecular sieve membranes with excellent performance. The research provides a simple synthesis method for novel W-MEL and W-MFI zeolite membrane materials, and innovatively proposes a fluorine-free hydrophobic modification strategy, so that the oil-water mixture can be effectively separated, and the method is applied to dye adsorption. The method provided by the application has strong operability, and has important industrial promotion and practical application value.

The application provides a CTAB modified two-dimensional RUB-18 zeolite membrane and a preparation method and application thereof in gas separation, and belongs to the technical field of two-dimensional nanosheet membrane preparation and gas separation. Two-dimensional RUB-18 zeolite nanosheet solution is obtained by ball milling and peeling; CTAB is doped into the two-dimensional RUB-18 zeolite nanosheet solution; and a porous substrate is put into the two-dimensional RUB-18 zeolite nanosheet solution doped with CTAB, so that a two-dimensional RUB-18 zeolite membrane is prepared by electrophoretic deposition. The method is mild and simple, the two-dimensional RUB-18 zeolite membrane is prepared from the two-dimensional RUB-18 zeolite nanosheet modified by CTAB, is simple, efficient, low in cost, and can grow a two-dimensional RUB-18 zeolite membrane with a thickness of 200-1000 nm on the porous substrate in 5-50 minutes, can be used for gas separation, and can balance permeability and selectivity.

The invention relates to the technical field of zeolite membrane synthesis, and discloses an acid-resistant zeolite membrane and a preparation method thereof.The preparation method comprises the steps that a silicon-aluminum type CHA molecular sieve membrane is prepared on an original carrier, and a zeolite membrane with unqualified ethanol permeation flux is screened to serve as a pre-structure carrier; immersing the pre-structured carrier into a TMADaOH template agent, and then drying the pre-structured carrier; preparing a hydrothermal synthesis reaction solution, transferring the hydrothermal synthesis reaction solution and the dried pre-structure carrier into a reaction kettle, performing hydrothermal synthesis, and finally taking out, cleaning and airing to obtain the acid-resistant zeolite membrane. According to the preparation method, secondary recycling of the waste zeolite membrane can be achieved, the production utilization rate is increased, the acid-resistant zeolite membrane is obtained, and meanwhile the usage amount of the template agent and the production cost are reduced.

This invention belongs to the field of membrane separation materials technology, and relates to a method for preparing ERI-type zeolite molecular sieve membranes and their applications. This method is green, environmentally friendly, simple, rapid, and economical. It eliminates the need for expensive organic template agents or environmentally harmful inorganic fluoride ions, resulting in low energy consumption and a simple, reproducible preparation process with a crystallization time of only 3-6 hours. The ERI-type zeolite molecular sieve membranes prepared by this invention exhibit excellent separation performance and good stability in the dehydration and purification of organic solvents such as acetic acid. The preparation process proposed in this invention is expected to provide a promising reference scheme for the preparation of high-performance zeolite membranes and possesses potential practical application feasibility.

A zeolite membrane composite (1) comprises a porous support (11) and a zeolite membrane (12) formed on the support (11). The zeolite membrane (12) includes a low-density layer (13) coating the support (11) and a compact layer (14) coating the low-density layer (13). The compact layer (14) has a higher zeolite crystalline phase content than the low-density layer (13). By forming the compact layer (14) on the low-density layer (13) coating the support (11) in this way, the fine, defect-free compact layer (14) can be formed more easily than if a compact layer were formed directly on a support. As a result, it is possible to achieve the zeolite membrane composite (1) with high permeability and high selectivity.

The invention belongs to the technical field of membrane separation, and relates to a method for preparing an AEI type zeolite molecular sieve membrane by a secondary growth hydrothermal method. The method comprises the steps that firstly, a prepared AEI type molecular sieve serves as a large seed crystal, a ball-milled AEI type molecular sieve serves as a small seed crystal, the AEI type molecular sieve is used for inducing growth of an AEI phase in a membrane layer, the compact AEI type zeolite membrane is prepared through a secondary hydrothermal synthesis method, and when the membrane is used for acetic acid-water separation, the separation performance is excellent. According to the method, the AEI molecular sieve is used as a seed crystal to induce the growth of the AEI membrane, the FAU molecular sieve is used for replacing traditional NaAlO2 to serve as an aluminum source, and the silicon-aluminum ratio of a membrane layer can be regulated and controlled by regulating and controlling the silicon-aluminum ratio in the membrane synthesis mother liquor. The invention provides the preparation method of the AEI type zeolite molecular sieve membrane with few defects, high density and firm combination with the carrier, and the controllable preparation of the high-performance AEI molecular sieve membrane is realized.

The present invention relates to a zeolite separation membrane reactor for dehydrogenation of a liquid organic hydrogen carrier. According to the present invention, it is possible to provide a zeolite separation membrane reactor for dehydrogenation of a liquid organic hydrogen carrier, which overcomes the thermodynamic limit of a dehydrogenation reaction by using a zeolite separation membrane reactor filled with a catalyst therein and achieves a conversion rate higher than an equilibrium conversion rate at a low reaction temperature, thereby having high hydrogen separation performance.

The object of an aspect of the present disclosure is to provide a zeolite membrane composite having high separation performance. A zeolite membrane composite in accordance with an aspect of the present disclosure has an inorganic porous support and a zeolite membrane which is formed on a surface of the inorganic porous support. In an X-ray diffraction pattern obtained by irradiating a surface of the zeolite membrane with X-rays at the minimum incident angle that allows the X-rays to pass through the zeolite membrane, an integrated intensity of a peak at or around 2θ=9.6° is 6.0 times or more an integrated intensity of a peak at or around 2θ=20.8°.

The application belongs to the technical field of chemistry and chemical industry, and particularly relates to a method for regenerating and utilizing waste stripping liquid of photoresist. The waste stripping liquid of photoresist is regenerated and utilized by the following steps: realizing waste liquid demulsification, viscosity reduction and impurity removal through specific modified magnetic nanoparticles, then carrying out pervaporation dehydration through a zeolite membrane covered with a zirconium-tannic acid-polyethyleneimine metal organic coordination network layer, and finally carrying out adsorption polishing and recombination, so that the waste stripping liquid of photoresist is regenerated and utilized, the water removal rate of the waste liquid is greater than 99.9%, and the recovery rate of effective components in the waste liquid is greater than 99.5%.

The utility model belongs to the technical field of carbon dioxide hydro-conversion, particularly relates to a membrane reactor for a reaction-separation coupling process, and aims to solve the problem of performance failure of the membrane reactor in a high-temperature environment in the background technology, the following scheme is provided: the membrane reactor comprises a reaction tube body, end covers are screwed on the outer walls of two ends of the reaction tube body, and the end covers are screwed on the outer walls of two ends of the reaction tube body; a product gas outlet is welded to one end of the outer wall of the bottom of the reaction tube body, a feed gas inlet is welded to the other end of the outer wall of the top of the reaction tube body, and a purge gas outlet is welded to the outer wall of one side of one end cover. The NaA molecular sieve membrane loaded by the ceramic hollow fiber carrier is adopted, a compact and defect-free zeolite membrane layer is formed through a multi-time in-situ growth process, the membrane can still keep a stable hydrophilic nano channel (the aperture is 0.4 nm) at the temperature of 300-400 DEG C and the high pressure of 4 MPa, water molecules are preferentially adsorbed and permeated, the thermodynamic equilibrium limitation is effectively broken, and compared with a traditional molecular sieve membrane, the membrane has the advantages that the membrane is simple in structure and convenient to use, and the cost is low. The thermal stability is obviously improved.

The invention relates to the technical field of refrigerating machines, in particular to a lithium bromide absorption refrigerating machine combined with a zeolite membrane technology and a refrigerating method, and the refrigerating machine comprises an absorber, a membrane separation unit, a compression unit and an evaporator; the membrane separation unit is mounted between the absorber and the compression unit, a feeding side inlet of the membrane separation unit is connected with a dilute solution outlet of the absorber, and a retentate side outlet of the membrane separation unit is connected with a concentrated solution inlet of the absorber; a permeation side outlet of the membrane separation unit is connected with an inlet of the compression unit, a liquefied water outlet of the compression unit is connected with an inlet of the evaporator, and a steam outlet of the evaporator is connected with a steam inlet of the absorber. A zeolite membrane normal-temperature concentration technology is utilized, a generator in a traditional lithium bromide absorption refrigerator can be omitted, meanwhile, a heat exchange network is reduced, the concentration efficiency of a lithium bromide refrigerating system is remarkably improved, energy consumption and dependence on a high-temperature heat source are effectively reduced, and traditional high-temperature concentration is reduced.

The invention relates to the technical field of metal anticorrosive coatings, in particular to a preparation process for eliminating performance difference of two sides of an aluminum alloy matrix MFI zeolite membrane, which comprises the following steps: preparing MFI zeolite membrane synthesis mother liquor from sodium hydroxide, deionized water, tetraethoxysilane and tetrapropylammonium hydroxide; carrying out surface treatment on the aluminum alloy matrix; the aluminum alloy matrix is placed in a reaction kettle containing mother liquor, and the aluminum alloy matrix does not make direct contact with the mother liquor initially; putting the reaction kettle into a drying oven for reaction; the reaction kettle is inverted, so that the surface of the aluminum alloy matrix is in uniform contact with the mother liquor and continuously reacts, and finally the MFI zeolite membrane with consistent properties on two sides is formed. The reaction kettle is heated until a uniform temperature field and a uniform fluid field are formed, and then the reaction kettle is inverted, so that the aluminum alloy is in uniform contact with the reaction liquid containing the primary crystal nucleus, the different-plane effect caused by the uneven temperature field, concentration field and convection in the reaction kettle in the in-situ hydrothermal synthesis process is effectively eliminated, and a foundation is laid for the in-situ hydrothermal synthesis process from laboratory research to large-scale industrial application.

A zeolite membrane structure (10) includes a support (20), a zeolite membrane (30), and a protective film (40). The zeolite membrane (30) is formed on a surface (23S) of the support (20). The protective film (40) is formed on a surface (30S) of the zeolite membrane (30). The protective film (40) is composed of organic-inorganic hybrid silica or carbon.