51 results about "Membrane synthesis" patented technology

The present invention discloses composite inorganic membranes, methods for making the same, and methods of separating gases, vapors, and liquids using the same. The composite zeolite membrane is prepared by TS-1 zeolite membrane synthesis, and subsequent palladium doping. In the composite zeolite membrane synthesis, two different methods can be employed, including in-situ crystallization of one or more layers of zeolite crystals an a porous membrane substrate, and a second growth method by in-situ crystallization of a continuous second layer of zeolite crystals on a seed layer of MFI zeolite crystals supported on a porous membrane substrate. The membranes in the form of disks, tubes, or hollow fibers have high gas selectivity over other small gases, very good impurity resistance, and excellent thermal and chemical stability over polymer membranes and other inorganic membranes for gas, vapor, and liquid, separations.

The invention discloses a method for synthesizing an oriented MFI type molecular sieve membrane by means of microwave heating. The method comprises the following steps of: 1) preparation of molecularsieve synthetic fluid, wherein the synthetic fluid consists of tetraethoxysilane, tetrapropylammonium hydroxide and water, which follow a mol ratio of 1:0.2-0.6:100-250; 2) stirring the synthetic fluid at the room temperature for 1-4 h, adding support body, carrying out aging for a time ranging from 10 min to 50 h in the condition of the room temperature or heating, or carrying out aging first fora time ranging from 10 min to 50 h in the condition of the room temperature or heating and then adding the support body, and synthesizing a molecular sieve membrane by means of microwave heating, wherein the synthesis temperature is 100-200 DEG C and the synthesis time is 10-30 min; and 3) washing and drying and finally obtaining the oriented MFI type molecular sieve membrane from the support body. The MFI type molecular sieve membrane synthesized with the method is b-axis oriented and has good synthetic repetition. The microwave heating greatly accelerates the nucleation and crystallizationspeed of the molecular sieve, remarkably reduces the molecular sieve membrane synthesis time and the energy consumption and is helpful for cost reduction.

Isolated nucleic acid molecules, designated MCT nucleic acid molecules, which encode novel MCT proteins from Corynebacterium glutamicum are described. The invention also provides antisense nucleic acid molecules, recombinant expression vectors containing MCT nucleic acid molecules, and host cells into which the expression vectors have been introduced. The invention still further provides isolated MCT proteins, mutated MCT proteins, fusion proteins, antigenic peptides and methods for the improvement of production of a desired compound from C. glutamicum based on genetic engineering of MCT genes in this organism.

The invention discloses a preparation method of an AlPO-18 molecular sieve membrane. The preparation method comprises following steps: (1) mixing and dissolving aluminum source, tetraethylammonium hydroxide, and phosphoric acid in water, then carrying out hydro-thermal synthesis reactions to obtain AlPO-18 molecular sieve crystal seed; (2) coating the AlPO-18 molecular sieve crystal seed on the inner surface of a porous ceramic tube carrier; (3) mixing and dissolving aluminum source, tetraethylammonium hydroxide, and phosphoric acid in water to obtain molecular sieve membrane synthesis mother liquid, putting the ceramic tube, which has been coated with the AlPO-18 molecular sieve crystal seed, in a reactor, adding the molecular sieve membrane synthesis mother liquid, and then carrying out a hydrothermal crystallization treatment so as to obtain an AlPO-18 molecular sieve membrane after aging; (4) burning the membrane tube to remove the template agent so as to obtain an activated AlPO-18 molecular sieve membrane. The AlPO-18 molecular sieve membrane synthesized by the preparation method is capable of being applied to separations of CO2 / CH4 and CO2 / H2, and has a high selectivity and a high throughput of separations of CO2 / CH4 and CO2 / H2.

Isolated nucleic acid molecules, designated MCT nucleic acid molecules, which encode novel MCT proteins from Corynebacterium glutamicum are described. The invention also provides antisense nucleic acid molecules, recombinant expression vectors containing MCT nucleic acid molecules, and host cells into which the expression vectors have been introduced. The invention still further provides isolated MCT proteins, mutated MCT proteins, fusion proteins, antigenic peptides and methods for the improvement of production of a desired compound from C. glutamicum based on genetic engineering of MCT genes in this organism.

The invention relates to a green synthesis method of an ultra-thin SSZ-13 molecular sieve membrane. The method comprises the steps: 1) preparing an all-silica CHA molecular sieve seed crystal, and performing ball milling so as to obtain a nano all-silica CHA seed crystal; 2) coating the nano all-silica CHA seed crystal on a porous carrier tube uniformly; 3) preparing an SSZ-13 molecular sieve membrane synthesis mother liquor; 4) putting the porous carrier tube obtained in the step 2) and the mother liquor obtained in the step 3) in a same crystallization kettle; 5) putting the crystallizationkettle in an oven for hydrothermal synthesis for 6-12 days at a synthesis temperature of 60-120 DEG C, washing the obtained membrane tube after completion of synthesis, and performing drying; and 6) performing high-temperature calcination for removal of a template so as to obtain the activated SSZ-13 molecular sieve membrane. The synthesis temperature is reduced greatly because the ultra-thin SSZ-13 molecular sieve membrane is synthesized at low temperature, use of a high-pressure crystallization kettle is avoided because the SSZ-13 molecular sieve membrane is synthesized under normal pressure, and meanwhile the thickness of the SSZ-13 molecular sieve membrane is reduced to 400-700 nm, so that the mass transfer resistance is reduced greatly, and the permeability is improved; and the methodcan also be applied to synthesis of other molecular sieve membranes.

The invention provides a polymer embedded metal organic framework membrane, a preparation method, a preparation device and application thereof. The preparation method includes: (1) encapsulating a hollow fiber membrane in a cross-flow membrane module to form a hollow fiber membrane module; (2) dissolving a metal salt and a ligand in a solvent respectively to obtain a metal salt solution and a ligand solution; (3) respectively pumping the metal salt solution and the ligand solution into a shell pass and a pipe pass of the hollow fiber membrane module at the same time to conduct membrane synthesis, performing pumping at 30-60DEG C continuously for 12-48h, then pumping an alcohol solvent or water into the shell pass and the pipe pass of the hollow fiber membrane module respectively to clean the membrane, and finally drying the membrane, thus obtaining the polymer embedded metal organic framework membrane. The membrane obtained by the invention can be applied to mixed gas separation. According to the invention, a to-be-embedded polar polymer is added directly in synthesis of the metal organic framework membrane, the traditional way of first synthesis and then modification is abandoned, and the method is concise, efficient and low in cost.

The invention relates to an all-silicon / high-silicon molecular sieve membrane and a preparation method thereof. The method comprises the following steps: (1) preparing a nanoscale molecular sieve seed crystal; (2) coating a porous carrier tube with the nanoscale molecular sieve seed crystal; (3) preparing molecular sieve membrane synthesis mother liquor; (4) crystallizing the porous carrier tube obtained in the step (2) and the mother liquor obtained in the step (3); (5) after the crystallization is finished, washing and drying the obtained membrane tube; and (6) roasting to remove the template agent, and cooling to obtain the activated all-silicon / high-silicon molecular sieve membrane. Compared with the prior art, the sieve membrane has the advantages of mild conditions, high speed, reduced equipment investment, suitability for various molecular sieve structures and the like.

The invention relates to a method for preparing a Ti -Si molecular sieve membrane by microwave radiating heating, belonging to the technical field of sieve membrane synthesis, in particular to a sieve membrane synthesis method. The method is characterized in that a carrier is directly contacted with a synthetic liquid, and is heated and crystallized by the microwave radiation. The experiment result shows that: compared with a hydrothermal synthesis method, under same synthesis condition, the TS-1 molecular sieve membrane obtained by a microwave heating method has remarkably improved catalytic activity. The molecular sieve membrane synthesized by the invention is uniform and compact, is small in crystalline grains without macropore defects, and has high catalytic activity and repeatability. By adopting the microwave radiating heating for crystallization, the synthesis time is greatly shortened and the property of the synthesized molecular sieve membrane is remarkably improved. The synthesized molecular sieve membrane has higher repeatability, is beneficial to lowering the cost, and is suitable to industry expanding.

The invention relates to an ultrathin molecular sieve membrane and a preparation method thereof. The method comprises the following steps: (1) preparing a nanoscale seed crystal; (2) uniformly coating a porous carrier tube with the nanoscale seed crystal; (3) preparing molecular sieve membrane synthesis mother liquor; (4) crystallizing the porous carrier tube obtained in the step (2) and the mother liquor obtained in the step (3); (5) after the crystallization is finished, washing and drying the obtained membrane tube; and (6) roasting and cooling to obtain the activated ultrathin molecular sieve membrane. Compared with the prior art, the ultrathin molecular sieve membrane has the advantages that the synthetic mother liquor with high silica-alumina ratio is adopted, an organic template agent is not used, and the film thickness can be effectively adjusted.

The present invention discloses an ionothermal synthesis method of a CHA type microporous aluminum phosphate molecular sieve membrane, wherein an imidazole-based ionic liquid is used as a solvent to synthesize an AlPO4-34 molecular sieve membrane on the surface of an alumina carrier through an ionothermal two-step synthesis method. The method of the present invention has the following characteristics that: the ionic liquid is used as the solvent and the template agent to carry out the crystallization reaction under the normal pressure, such that the safe hidden danger caused by the system self-pressure during the conventional molecular sieve membrane synthesis process is overcome; acid-alkali waste liquid emission does not exist, and the environment protection property is provided; and the operation is simple, the synthesis liquid aging is not required, the crystal seed introducing is not required, and the industrial expanding production is easily achieved.

The invention discloses a method for synthesizing a PHI-type molecular sieve membrane on the surface of an α-Al2O3 support body. In the method, the support body pretreatment and the preparation of a seed crystal synthesis solution are carried out first, and then the crystal seed is introduced, and then the membrane is synthesized and washed and dried. The PHI type molecular sieve membrane is obtained; the preparation of the seed crystal synthesis solution is to configure alkali, silicon source, aluminum source and deionized water according to the molar ratio of Na2O, K2O, SiO2, Al2O3 and H2O, a1, b1, c1, 1 and d1, The source of alkali is Na2O and K2O, a1=1.5-2.5, b1=0.2-0.5, c1=4-8, d1=80-108; the molecular sieve membrane synthesized by the present invention has perfect crystal form, compact structure and good permeability, The synthesis process has high repeatability, the membrane has a long service life, and is suitable for industrial scale-up.

The invention relates to the field of mesoporous heteroatom molecular sieve membrane synthesis, and discloses a method for synchronizing mesoporous heteroatom molecular sieves by means of photo-induced self-assembly. The method includes uniformly mixing and stirring transition metal precursors, silicon sources, template agents and photo-acid generators PAG with one another to obtain membrane coating solution; uniformly smearing the membrane coating solution on substrates to form liquid membranes; allowing ultraviolet light with the wavelength of 350-420 nm and the intensity of 10-100% to irradiate on the liquid membranes so as to obtain mesoporous heteroatom molecular sieve membranes with the template agents; allowing ultraviolet light with the wavelength of 350 nm and the intensity of 50-100% to irradiate on the mesoporous heteroatom molecular sieve membranes for 60-120 min and removing the template agents to obtain mesoporous heteroatom molecular sieve membranes. The method has the advantages that the method is high in curing rate and free of solvents, and energy can be saved; the reaction time can be adjusted, optical parameters can be controlled, the membrane coating solution can keep stable under non-illumination conditions, and the method is an efficient, controllable and green preparation technology.

The invention relates to the technical field of preparation of separating membrane composite materials and particularly relates to a steam-assisted wet-process nanofiltration membrane preparation method and a base membrane preparation method. The steam-assisted wet-process nanofiltration membrane preparation method is characterized in that the hydrolyzation degree of trimesoyl chloride is controlled by controlling a heating temperature and a concentration of water steam, and therefore, the desalinization rate of a nanofiltration membrane product is controlled. The steam-assisted wet-process nanofiltration membrane preparation method has the beneficial effects that a nanofiltration membrane synthesis method capable of controllably adjusting the desalinization rate of the nanofiltration membrane is provided, the operation is simple, the cost is low, and the repeatability of the predetermined desalinization rate of the nanofiltration membrane is high; and by utilizing water steam in a drying process of an organic isoparaffin solvent, a polysulfone-base membrane can still in a moist state when the drying of organic isoparaffin is guaranteed, so that the water flux can be well maintained.

The invention relates to an economic synthesis method of an ultrathin SSZ-13 molecular sieve membrane. The method comprises the following steps: loading a seed crystal on a porous carrier, dipping theporous carrier in a template solution or molecular sieve membrane synthesis mother liquor, carrying out crystallization in a crystallization kettle with only a small amount of liquid (the template solution or the molecular sieve membrane synthesis mother liquor is not in direct contact with the carrier), converting amorphous particles in a seed crystal layer into molecular sieve crystals at a fixed point, and finally forming a continuous molecular sieve membrane. Compared with the prior art, the method has the advantages that the ultrathin SSZ-13 molecular sieve membrane is synthesized, and the thickness of the membrane is effectively reduced to 200-500 nanometers, so that the mass transfer resistance is greatly reduced, and the permeability is improved. In addition, in a conventional hydrothermal method, a large amount of mother liquor is consumed, and the provided synthesis method reduces the using amount of mother liquor, greatly increases the utilization rate of raw materials, belongs to atom economic synthesis, and is also suitable for synthesis of other molecular sieve membranes.

Provided are an all-silica zeolite separation membrane for separating carbon dioxide, etc., and not causing a decrease in the processing amount due to adsorption of water molecules, and a production method therefor. One aspect of the present invention is a zeolite separation membrane, in which the framework of a zeolite crystal structure formed on a porous support is all silica, characterized in that the zeolite crystal structure formed on the porous support is fluorine free. Another aspect of the present invention is a method for producing a zeolite separation membrane having a zeolite crystal structure on a porous support, characterized in that the method includes a step of producing a seed crystal, a step of applying the seed crystal onto the porous support, a step of producing a membrane synthesis raw material composition, and a step of immersing the porous support having the seed crystal applied thereon in the membrane synthesis raw material composition and performing hydrothermal synthesis, and the membrane synthesis raw material composition contains a silica source and an organic template and does not contain a fluorine compound.

The invention provides a nanometer biological membrane for quickly detecting escherichia coli and a preparation method thereof. The preparation method of the nanometer biological membrane comprises the following steps of: nanometer fiber membrane preparation, polyaniline-nylon nanometer fiber membrane synthesis and antibody labeling. The invention has the advantages that with the adoption of the nanometer biological membrane, the existence of the escherichia coli can be detected within 30 minutes, the detection is limited within 10-106 CFU / mL, and the nanometer biological membrane has higher sensitivity.

The invention discloses a vacuum insulation plate structure and relates to the technical field of refrigeration equipment. The vacuum insulation plate structure comprises a barrier bag, wherein the barrier bag is formed a heat seal, the cold surface synthetic membrane is arranged on the cold surface, the hot surface synthetic membrane is arranged on the hot surface, the heat seal is formed at thejuncture of the cold surface synthetic membrane and the hot surface synthetic membrane. The cold surface synthetic membrane and the hot surface synthetic membrane are in an asymmetric structure, themiddle part of the hot surface synthetic membrane is bent downwards, the cross section of the hot surface synthetic membrane is in a U shape, and a vacuum containing cavity is formed in the U-shaped structure. Core materials are filled in the vacuum containing cavity, and a getter is arranged in the core materials. The hot surface synthetic membrane and the cold surface synthetic membrane are of an asymmetric structure, the heat seal is moved upwards to the surface of the synthetic membrane, the core materials and the getter are bagged, and the heat seal is disposed at the position of the surface layer of the core material port, so that the cold quantity transmission path is effectively reduced, the heat preservation performance of a heat insulation plate is improved, and meanwhile, the cold quantity transmission path is reduced, the boundary effect of the vacuum insulation plate is weakened, and the problem that the edge of the heat insulation plate is condensed due to the boundary effect is solved.

The invention relates to a method for synthesizing a DDR molecular sieve membrane. The method comprises the following steps: carrying out ball milling on DDR molecular sieve powder to obtain submicronDDR molecular sieve seed crystals; mixing a silicon source, amantadine, tetraethylammonium hydroxide and water to obtain DDR molecular sieve membrane synthesis mother liquor; coating a porous carriertube with the DDR molecular sieve seed crystals; putting the DDR molecular sieve membrane synthesis mother liquor and the porous carrier tube into a crystallization kettle for hydrothermal synthesistreatment, and washing and drying an obtained membrane tube after synthesis is finished; and roasting the membrane tube in an ozone atmosphere to remove the tetraethylammonium hydroxide to obtain an activated DDR molecular sieve membrane. Compared with the prior art, the method utilizes a mixed template agent consisting of the amantadine and the tetraethylammonium hydroxide, and the addition of the tetraethylammonium hydroxide inhibits generation of impurities, so that the DDR molecular sieve membrane can be rapidly synthesized at high temperature, the crystallization time is greatly shortened, and the obtained DDR molecular sieve membrane has relatively high CO2-CH4 separation selectivity.

The invention discloses an expansive composite flame-retardant membrane, and belongs to the field of flame-retardant membrane synthesis. The flame-retardant membrane is prepared from, by mass, 3-5 parts of nanocrystalline cellulose, 0.5-2 parts of ammonium polyphosphate and 1-2 parts of nano-silicon dioxide. The invention further discloses a preparation method of the expansive composite flame-retardant membrane. The expansive composite flame-retardant membrane is obtained by adopting layer-by-layer self-assembly. Through testing, the oxygen index of the expansive composite flame-retardant membrane is 32.4%-37.5%, and when the expansive composite flame-retardant membrane is applied to surface attaching treatment of a wood-plastic composite material, the average heat release speed of the wood-plastic composite material is 70.2-90.3 kW / m<2>. The obtained expansive composite flame-retardant membrane has the good flame retardance and is high in attaching force to the composite material. The flame-retardant membrane synthesis process is simple and environmentally friendly, and the expansive compositie flame-retardant membrane can be used for industrialized batch production.

The invention relates to a phosphorus-aluminum molecular sieve membrane synthesis method, wherein a three-electrode system or two-electrode system is adopted, a substrate and a synthesis liquid are placed in a reaction bottle, a constant potential method or linear scanning or pulsed current method or constant current method is adopted to carry out an electrochemical synthesis reaction, and the substrate is taken out and then is subjected to blow-drying after the reaction. According to the present invention, the synthesis method is simple and fast; the molecular sieve membrane synthesized by using the method has the good compactness; the molecular sieve membrane can be controllably synthesized by adjusting the synthesis parameters such as voltage, current, temperature, concentrations of each component in the synthesis liquid and the like; and the molecular sieve membrane synthesis method has high repeatability and is suitable for industrial scale-up.

The present invention discloses a mutant Neisseria having extensive membrane blebbing, both an indicium and a cause of virulence in the gonococcus and meningococcus. Methods are disclosed for making and characterizing the mutant, bmrRS. Methods are disclosed for isolating bmrRS membranes for use as a vaccine. Methods are also disclosed for the use of the mutant for determining the virulence of clinical samples of N. gonorrhoeae and N. meningitidis. Methods are also disclosed for the screening of antibiotics targeted to virulent Neisseria.

The invention belongs to the technical field of molecular sieve membranes, and particularly relates to a method for preparing a molecular sieve membrane by a dip-coating molecular sieve seed crystal method. The method comprises the following steps: obtaining a cleaned, baked and calcined porous carrier; dip-coating the porous carrier with a seed crystal suspension, and then drying and curing to obtain a target porous carrier; the target porous carrier is placed in a membrane synthesis solution for a crystallization reaction, the molecular sieve membrane is obtained, and the membrane synthesis solution in the seed crystal suspension comprises a silicon source, an aluminum source, an alkali source and water. The seed crystal dip-coating can be carried out at normal temperature, so that the problem that the existing high-temperature crystal coating method needs to carry out crystal coating under a high-temperature condition is avoided, and the problem that the molecular sieve membrane prepared by the existing high-temperature crystal coating method is non-uniform in performance is avoided; according to the method, the operation difficulty is reduced, meanwhile, the molecular sieve membrane can be obtained through repeated replication, and the defect that the performance of the molecular sieve membrane is different under repeated coating operation is overcome.

This invention is a kind of catalysts separation integration of micro-membrane reactor manufacturing methods. It has the membrane granular catalyst molecular sieve that has shape-selective catalytic selective. This method use of microwave synthesis technology manufacture catalytic - Separation integration NaA molecular sieve membrane reactor. The molecular sieve membrane reactor manufacture as this method, it has dense homogeneous continuous film, and high catalysis, selective separation and have the advantages of process simple, take short time. The invention of the catalytic - from the integration of micro-membrane reactor technology manufacturing methods are: put the granular catalyst immerse to molecular sieve membrane synthesis liquor, standing and aging of 0.5 to 24 hours then implantation in the microwave at 60 ~ 130 degreeC heating Synthesis of 5 to 60 minutes, after the end of microwave heating, cooling, filtration, using deionized water wash to neutral, drying at the temperature of 70 ~ 130 degreeC, so the granular catalyst - separation Integrated membrane reactor finished.

The invention relates to a mixed matrix membrane with a chiral metal organic molecular cage as filler and preparation and application thereof. The method includes 1) preparing a crown ether functionalized chiral binaphthyl dicarboxylic acid ligand by taking 6,6'-dichloro-2,2'-diethoxy-[1,1'-binaphthyl]-4,4'-dicarboxylic acid as an initial raw material; 2) preparing a chiral metal organic molecular cage crystal through a solvothermal method; 3) fully mixing with an activated polyethersulfone polymer matrix to obtain a membrane casting solution; and 4) preparing the mixed matrix membrane with the chiral metal organic molecular cage as the filler through a phase inversion method, wherein the mixed matrix membrane is used for chiral separation of racemic compounds. Compared with the prior art, the controllable synthesis of the chiral metal organic molecular cage is realized, the high-quality mixed matrix membrane is prepared by the phase inversion method, and the problems of non-uniform mixing, poor membrane forming property, many defects, poor mechanical property and the like which are easily generated in the existing chiral mixed matrix membrane synthesis process are solved; the mixed matrix membrane has a wide development prospect in the application aspects of separation of chiral drugs and the like.

The invention relates to creation of a hydrothermal supported liquid membrane synthesis method for a nano material, being a new nano material synthesis technology. By selecting an appropriate supporter, a membrane solvent and a carrier and designing a fixing device for a supported liquid membrane in a hydrothermal environment, the hydrothermal supported liquid membrane synthesis method for the nano material is created, and combination of a hydrothermal method and a supported liquid membrane method is realized, so that the two methods are effectively and synergistically carried out when the nano material is synthesized, and one complete nano material synthesis system is formed. The system overcomes the defects of the supported liquid membrane method that the supported liquid membrane methodonly can be applied to a normal temperature environment, reaction rate is low and yield is low and also overcomes the limitation of the hydrothermal method applied to synthesis of a metal salt type nano material. The system has the advantages of simple operation, mild conditions, adjustable reaction temperature, easy-to-control product morphology and structure and wide application range and is acomprehensive nano material synthesis method.

The invention belongs to the technical field of separation materials, and provides a preparation method for synthesizing a ZIF-67 membrane through in-hole membrane formation, which specifically comprises the following steps: introducing a precursor solution of cobalt into a porous carrier pore channel, suspending the carrier in a kettle containing a certain amount of ligand solution, forming steam from the solution in the kettle under a heating condition, and forming a membrane at a phase interface by the steam formed by the solution in the kettle and the precursor solution in the pore channel. Although the membrane is divided into countless small membranes by each hole wall, each membrane is formed in a small space, is relatively complete and thin, and has no gap with the hole wall, a plurality of complete membranes and the hole wall form a large complete membrane together, and the membrane is not a large membrane, so that the membrane can be thin and has good stability, and the purpose of separation is achieved. The method has the advantages of high repeatability, effective solvent saving and certain separation capability.

The invention discloses a method for preparing a SAPO-34 molecular sieve membrane by a variable temperature method. The steps include: 1) synthesizing a SAPO-34 molecular sieve crystal seed; 2) uniformly coating the SAPO-34 molecular sieve seed crystal on a porous carrier; 3) preparing SAPO ‑34 molecular sieve membrane synthesis mother liquor; 4) immerse the porous carrier coated with SAPO‑34 molecular sieve seeds prepared in step 2) into the synthesis mother liquor for aging; 5) hydrothermal crystallization at 200-260°C for 0.1-5 hours , and then lower the temperature and continue the hydrothermal crystallization for 0.1 to 96 hours; 6) roast to remove the template agent to obtain a SAPO‑34 molecular sieve membrane. The invention utilizes a variable temperature method to prepare a thickness-controllable SAPO-34 molecular sieve membrane, successfully reduces the thickness of the molecular sieve membrane to 1 micron, thereby greatly reducing the mass transfer resistance of the SAPO-34 molecular sieve membrane and improving the permeability of the membrane.