627results about "Distillation" patented technology

The invention discloses a crown ether grafted polyarylether sulfone ion separation membrane as well as a preparation method and application thereof, and belongs to the technical field of ion separation membranes, collaborative optimization is realized through crown ether accurate grafting and ultrathin ordered membrane formation: a main chain of polyarylether sulfone is grafted with 4 '-aminobenzo-12-crown-4 to form an inherent channel adapted to Li, and the specific surface area of the main chain is increased; the ultrathin film is prepared by a water surface spreading method, and the ion transmission path is shortened. Finally, in a LiCl / MgCl system, Liion flux has high selectivity, high permeation-high selectivity cooperation is preliminarily realized, the chemical synthesis step can be amplified to a kilogram level, and after a DPAES-g-CE / dichloromethane solution is dropwise added to the water surface, the DPAES-g-CE / dichloromethane solution is rapidly spread to form a film without precise equipment; the raw materials are industrial-grade monomers and have no toxic residues, the membrane can be recycled and reused through dichloromethane, the equipment cost is reduced by about 90%, and industrialization is easy; the main chain of the polyaryl ether sulfone is high in rigidity and resistant to high temperature and chemical corrosion; crown ether grafting avoids molecular chain agglomeration, and the swelling rate is far lower than that of a traditional sulfonated membrane.

The invention provides an optical transparency-optical confinement composite nanofiber membrane as well as a preparation method and application thereof. The optical transparency-optical confinement composite nanofiber membrane comprises a PDMS (Polydimethylsiloxane) / PS (Polystyrene) / TPU (Thermoplastic Polyurethane) nanofiber membrane and a photothermal conversion material layer loaded on the PDMS / PS / TPU nanofiber membrane, the PDMS / PS / TPU nanofiber membrane is prepared by taking PDMS, PS and TPU as raw materials and adopting an electrostatic spinning technology; the photothermal conversion material layer comprises honeycomb porous carbon nanofibers and PDA (Personal Digital Assistant). The optical transparency-optical confinement composite nanofiber membrane and the PDMS / PS / TPU nanofiber membrane have excellent light transmittance and hydrophobicity, the photo-thermal conversion material layer has excellent light absorptivity and high photo-thermal conversion capacity, and the optical transparency-optical confinement composite nanofiber membrane has high membrane flux when being used for photo-thermal membrane distillation desalination. And the photo-thermal film is excellent in distillation performance stability.

The invention discloses a preparation method of a high-purity ultra-clean hydroxylamine aqueous solution. A four-stage purification process comprises the following steps: 1) low-temperature chelation-ceramic membrane metal removal; 2) molecular sieve membrane rectification decomposition prevention; 3) pulse electrodialysis reversal deep desalination; and 4) gradient filtration terminal refining. According to the preparation method of the high-purity ultra-clean hydroxylamine aqueous solution, a low-temperature molecular sieve membrane rectification technology is adopted, hydroxylamine liquid-phase thermal decomposition is avoided through a vapor phase separation mechanism, and the decomposition rate is reduced to 1t from 15% of a traditional process; the method comprises the following steps of: removing metal through chelation-electrodialysis synergistically, ensuring that Fe and Cu ion residues are less than or equal to 0.05 ppb through a thiosemicarbazide-bipolar membrane system, ensuring the nitrogen environment in the whole process, ensuring that the dissolved oxygen is less than or equal to 5ppb, replacing liquid phase distillation with molecular sieve membrane vapor phase separation, solving hydroxylamine liquid phase thermal decomposition, and breaking through the trace metal removal limit by combining thiosemicarbazide-bipolar membrane synergistically removing impurities. And then through nanoscale terminal filtration, the metal / particle control reaches ppb-level limit which is superior to the SEMI standard, and double spanning of quality and cost is realized.

The invention relates to the technical field of membrane separation materials, in particular to a mixed matrix membrane and a preparation method and application thereof. The mixed matrix membrane comprises: (1) a polymer functional membrane; (2) a base film for supporting the polymer functional film; a polymer in the polymer functional film comprises a polymer with a structure as shown in a formula (a), in the formula (a), R0 is an alkylene chain, R1 is a polysiloxane group, R2 is alkyl or hydrogen, and m is equal to 1-20. According to the present invention, the functional membrane prepared from the polymer having the structure (a) is used, and the structure of the polysiloxane is designed and optimized, such that the mixed matrix membrane has excellent organic solvent tolerance and organic solvent pervaporation separation property, and the interfacial compatibility between the polymer and the porous filler can be improved.

The invention discloses a membrane assembly with flexible turbulent flow fins for a membrane distillation seawater desalination system, which is characterized by comprising an upper wall, a lower wall, a distillation membrane and flexible fin plates, a hot material liquid channel is formed in the upper wall; a cold material liquid channel is formed in the lower wall; the distillation film is arranged between the upper wall and the lower wall, and two sides of the distillation film are respectively communicated with the hot feed liquid channel and the cold feed liquid channel; a plurality of flexible fins are arranged on the side, facing the distillation film, of the flexible fin plate, and the flexible fin plate is arranged in the hot material liquid channel. The membrane module can effectively weaken the polarization phenomenon and improve the heat and mass transfer capacity and the anti-pollution capacity.

The invention relates to a lignin-based polymer pervaporation membrane, a preparation method thereof and a method for separating and purifying cyclohexane-KA oil. The invention aims to provide a pervaporation membrane which is high in permselectivity, high in stability and good in mechanical property. The pervaporation membrane is used for cyclohexane-KA oil separation and has the advantages of high separation efficiency, low energy consumption and simple process. The preparation method comprises the following steps: adding the surfactant, the polymer and the solvent into a reactor, and stirring at 50-70 DEG C for 4-6 hours to obtain a mixed solution; the method comprises the following steps: adding lignin and a solvent into a reactor, and stirring at room temperature for 4-6 hours to obtain a lignin solution; dropwise adding the lignin solution into the mixed solution, and continuously stirring at constant temperature for 12-24 hours to obtain a membrane casting solution; transferring the membrane casting solution to a centrifugal tube, performing centrifugal separation, and uniformly coating the membrane casting solution on an ultrafiltration membrane material with the membrane thickness of 100-200mm to form a uniform liquid membrane; and drying the liquid membrane to obtain the lignin-based polymer pervaporation membrane. Belongs to the technical field of membrane separation.

The invention discloses a method for intensifying mass transfer by electrolyzed water driven bilateral air-blowing membrane distillation, which comprises the following steps: a three-chamber device is sequentially provided with a positive chamber, a negative chamber and a concentration chamber, the positive chamber and the negative chamber are separated by a nylon diaphragm, and the negative chamber and the concentration chamber are separated by a composite membrane; the method comprises the following steps: preparing materials, wherein an alkaline solution is used as electrolyte of an anode chamber and a cathode chamber; water molecule mass transfer: liquid water molecules in the concentration chamber are driven by vapor pressure difference, and the liquid water molecules absorb heat, are vaporized, penetrate through the composite membrane, enter the cathode chamber and are condensed into a liquid state; uniformizing: uniformizing the concentration of the electrolyte in the cathode chamber by using hydrogen generated in the cathode chamber in the water electrolysis process; and air blowing operation: oxygen generated by the anode is blown into the concentration chamber after being subjected to gas-liquid separation. The problem of absorbent regeneration is solved through the electrolyte of alkaline electrolyzed water, low-value oxygen generated by the electrolyzed water is reasonably utilized, and continuous concentration of high-salinity wastewater at room temperature is realized by coupling absorption membrane distillation and bubbling membrane distillation.

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.

The invention discloses a thermal gradient temperature control type membrane distillation treatment device for industrial wastewater, relates to the technical field of wastewater treatment, and aims to solve the problems that the fluid resistance of a local area is increased in the membrane distillation process, and the separation and purification effect is poor as the temperature difference between the two sides of a membrane is smaller than the fluid temperature difference. The membrane distillation device specifically comprises a membrane shell and water distribution assemblies arranged in the membrane shell and is mainly applied to the membrane distillation treatment process of industrial wastewater, the water distribution assemblies are synchronously arranged on the water inlet side and the water outlet side of the wastewater, the flow direction of the wastewater is changed through tangential grooves and vertical grooves in the water distribution assemblies, and the fluid resistance of a local area in a concentration boundary layer is weakened; and secondary flow guide mixed hot working media and wastewater are adopted to jointly complete cyclic distillation, and based on reduction of membrane interface local area fluid resistance and damage of membrane interface temperature and concentration polarization phenomena, the driving force of the membrane distillation process is increased, and the separation and purification effect is improved.

The application couples the pervaporation membrane process breaking the azeotropic system balance, the high-pressure rectification tower with high-efficiency separation and the reverse osmosis membrane process blocking the penetration of trace metal ions, so as to integrate a purification process for producing electronic-grade DMC. The method helps the membrane method to obtain practical industrial application in the electronic-grade DMC industry, and the NH2-PDMS composite membrane has organic solvent resistance, preferential selectivity for DMC organic matter, and blocking penetration effect on metal ions and micro-plastic particles with concentration of ppm or ppb.

Devices, systems, and techniques can be provided for processing an oil-containing material with an alcohol-based solvent to extract oil from the material. In some examples, a system includes a pretreatment dehydration vessel that removes water from the oil-containing material prior to processing the oil-containing material in an extractor to extract oil from the material. An alcohol-based solvent may also be supplied to the dehydration vessel to remove water from the oil-containing material, thereby generating a dehydrated material that can be extracted in a downstream extractor.

A transient operation method for a separation device includes a separation membrane complex including: a separation membrane; and a substrate arranged on one side of the separation membrane, the separation device having a first flow path and a second flow path, the first flow path being positioned on a side closer to the separation membrane of the separation membrane complex, the second flow path being positioned on a side closer to the substrate of the separation membrane complex, the transient operation method including supplying gases to the first flow path and the second flow path, respectively, and heating the separation membrane complex. An average relative humidity of a gas A supplied to the first flow path is higher than an average relative humidity of a gas B supplied to the second flow path.

The invention belongs to the field of inorganic chemical industry, and particularly relates to a method and a system for efficiently utilizing a phosphate fertilizer byproduct, the method comprises the following steps: carrying out acidolysis on fluosilicic acid with the concentration of more than or equal to 45% wt and concentrated sulfuric acid to generate a mixed solution of silicon tetrafluoride gas and fluorosulfonic acid; the mass ratio of the fluosilicic acid to the concentrated sulfuric acid is controlled to be 1: (4-15); pyrolyzing the obtained fluorosulfonic acid to generate dilute sulphuric acid, hydrogen fluoride and water vapor, forming 98% concentrated sulphuric acid from part of dilute sulphuric acid and fuming sulphuric acid, drying hydrogen fluoride to obtain crude hydrogen fluoride gas, and condensing and rectifying to obtain anhydrous hydrogen fluoride; the rest dilute sulphuric acid is partially compounded and then returned for acidolysis, and the rest dilute sulphuric acid is used for producing white carbon black and flows back to a wet-process phosphoric acid system; and circularly absorbing the obtained silicon tetrafluoride gas by using secondary concentrated fluosilicic acid to obtain fluosilicic acid with the mass concentration of more than or equal to 45%, recycling the fluosilicic acid for acidolysis reaction, and modifying the concentrated by-product silicon dioxide to obtain the high-activity white carbon black. The problems of energy consumption and cost are solved, and efficient circulation and poly-generation of fluorine and silicon resources are achieved in the whole process.

The invention discloses a preparation method and application of a layered column three-dimensional MOF enhanced mixed matrix membrane, and belongs to the technical field of pervaporation membrane separation. The preparation method comprises the following steps: firstly, dissolving a copper metal source and 2, 3, 6, 7, 10, 11-hexahydroxytribenzene in a solvent to obtain Cu < 2 + > and a deprotonated organic ligand, adding a pillar ligand bipyridine in situ, and co-coordinating the double ligand and Cu < 2 + > to generate a layered column three-dimensional MOF (Metal Organic Framework); and doping the layered column three-dimensional MOF into a polymer matrix to prepare a membrane casting solution, and coating the surface of a support body with the membrane casting solution to prepare the layered column three-dimensional MOF enhanced mixed matrix membrane. According to the invention, the pillar ligand dipyridyl provides a supporting effect for the three-dimensional MOF and constructs a three-dimensional pore channel at the same time; the affinity site of the three-dimensional MOF has conjugated pi-pi, hydrophobic and hydrogen bond interaction on the perfume; the three-dimensional MOF and a high-molecular polymer have excellent compatibility, and the mixed matrix membrane simultaneously has affinity of the three-dimensional MOF to 2-PE and hydrophobicity of a polymer matrix; the pervaporation membrane can be used for pervaporation membrane perfume separation.

The invention discloses a photo-thermal composite desalination membrane with an enhanced MOF (Metal Organic Framework) heat insulation layer and a preparation method. The membrane comprises a porous support layer, an NH2-UiO-66 heat insulation middle layer and a PVA-GO photo-thermal separation layer, wherein the NH2-UiO-66 heat insulation middle layer grows on the surface of the porous support layer in situ; and the PVA-GO photo-thermal separation layer is sprayed on the surface of the heat insulation middle layer and is subjected to photo-thermal induced crosslinking. The preparation method comprises the following steps: firstly, successfully growing an NH2-UiO-66 nano heat insulation layer with a uniform granular structure on the surface of a SE / PMIA membrane by an in-situ growth method, then successfully spraying a PVA-GO solution to the surface of the NH2-UiO-66 (at) SE / PMIA membrane by a spraying method, and successfully preparing the photo-thermal composite desalination membrane PVA-GO (at) NH2-UiO-66 (at) SE / PMIA by utilizing a photo-thermal effect. According to the photo-thermal composite desalination membrane, on the basis of realizing efficient photo-thermal conversion to drive cross-linking of the separation layer, the permeability and the separation performance are further improved, and the membrane has excellent performance in actual seawater desalination treatment.

The present invention discloses the manufacture of a porous fluoropolymer membrane comprising a blend of N-butylpyrrolidone and a co-solvent derived from lactic acid wherein the content of N-butylpyrrolidone in the solvent system is at least 50% or more.

The application discloses a kind of covalent organic framework films based on multifunctional catalyst regulation, the film includes functional layer and base film, the functional layer is composed of covalent organic framework nanosheet and cellulose nanomaterial.Its preparation process includes that two kinds of monomers are synthesized covalent organic framework nanosheet dispersion under the regulation of multifunctional catalyst by water-oil phase transfer polymerization method, nanosheet dispersion and cellulose nanomaterial dispersion are blended and dispersed with the volume ratio of 10-20:1, and are filtered on the surface of base film by vacuum assisted layer-by-layer self-assembly process.The multiple regulation of multifunctional catalyst makes the synthesized nanosheet have high aspect ratio and crystallinity, which helps to be assembled into dense and defect-free covalent organic framework film.The application is simple and easy to operate, and has good universality and repeatability.The covalent organic framework film is used for pervaporation seawater desalination, and shows excellent performance and long-period running stability.

The present disclosure relates to a membrane for water distillation, and a system comprising the membrane. The membrane comprises a porous material comprising cellulosic fibers in which a long chain fatty acid is grafted to one or more hydroxyl groups of the cellulosic fibers. During distillation, the contact angle between water and the membrane is greater than 90 degrees.

The invention discloses a membrane separation experiment device and an experiment method thereof.The membrane separation experiment device comprises a raw material supply assembly, a heating assembly, a first separation assembly, a second separation assembly and a vacuum assembly, the raw material supply assembly comprises a raw material tank and an extraction part, and the raw material tank is connected with the extraction part; the heating assembly is connected with the extraction piece, and the heating assembly is used for heating the raw materials; the first separation assembly is connected with the heating assembly, and the first separation assembly is used for separating the mixed liquid; the second separation assembly is used for separating the mixed liquid before the first separation assembly works so as to determine optimal experiment parameters; the vacuum assembly is connected with the first separation assembly and the second separation assembly. According to the invention, continuous pervaporation separation of the mixed liquid can be realized, the problem of sealing failure or leakage of the first separation assembly caused by a high-temperature medium or fluid is avoided, and the risks of energy consumption waste and misoperation caused by unreasonable experimental parameters are reduced.

The disclosure relates to a purification system and a purification bag (6) for use therein, configured for (solar) heat-driven water purification of contaminated water. The purification bag (6) comprises a distillation assembly (601,..60n), comprising: - a contaminated water chamber (30) for collecting contaminated water, the contaminated water chamber (30) comprising a top sheet configured for absorbing heat; - a purified water chamber (50) for collecting purified water, the purified water chamber (50) comprising a condensation sheet configured for collecting condensed purified water; - a membrane (40) arranged between the top sheet and condensation sheet, the membrane dividing the distillation assembly into the contaminated water chamber (30) and the purified water chamber (50), wherein the membrane (40) comprises a membrane sheet configured for separation of the associate part of the contaminated water portion received by the distillation assembly into the purified water portion and a residual water portion comprising water and contaminants remaining in the contaminated water chamber by at least one of membrane distillation and pervaporation through the membrane sheet; wherein the top sheet and the membrane sheet are polymeric sheets that are bonded to each other by welding according to a welding pattern.

This device for recovering water from organic substance-containing drainage water recovers water by treating drainage water that contains a volatile organic substance or a low-molecular-weight organic substance having a molecular weight of at most 200, and comprises a separation membrane module 2 for subjecting the drainage water to a pervaporation treatment by using a separation membrane having a pore diameter of 3.0-4.2 Å, wherein treated water from which the organic substance has been removed by the separation membrane module 2 is recovered.

The invention discloses N-alkylated / sulfonated benzimidazole polyaryletherketone / polyaryletherketone sulfone with controllable grafting density as well as a preparation method and application of the N-alkylated / sulfonated benzimidazole polyaryletherketone / polyaryletherketone sulfone. The preparation method comprises the following steps: firstly, introducing a protecting group on a phenolic hydroxyl group of a bisphenol monomer containing a benzimidazole structure, then carrying out nucleophilic substitution reaction on alkyl halide / alkyl halide sulfonic acid and-NH, and then removing the protecting group to obtain an N-alkylated / sulfonated benzimidazole functionalized bisphenol monomer; copolymerizing the monomer, a bisphenol monomer and a difluoro monomer to obtain a polymer; alkyl or alkyl sulfonic acid is introduced to a benzimidazole ring, so that-NH bonds are passivated, a steric hindrance effect is formed, and gelation of the polymer under a high polymerization degree is avoided; by adjusting the molar ratio of the monomers, the retention stability of the functional groups can be effectively controlled, and compared with the traditional grafting on the polymer, the non-regulation of functionalization and the gelation of the polymer are effectively avoided.

The invention discloses a fluorine-containing aromatic polyamide film as well as a preparation method and application thereof, and belongs to the technical field of separation film materials. The invention aims to solve the problems of low flux and poor selectivity of the existing membrane material in non-polar solvent separation. The fluorine-containing aromatic polyamide film comprises a porous supporting layer and a fluorine-containing polyamide selection layer formed by interfacial polymerization, the invention discloses application of a fluorine-containing aromatic polyamide film in hydrocarbon separation. The membrane has excellent separation performance (toluene flux gt, 0.1 L.m <-2 >. H <-1 >. Bar <-1 > and TIPB rejection rate gt, 50%) on a toluene / TIPB binary system, can effectively separate complex multi-element organic compound mixtures, shows differential separation performance on different types of hydrocarbon compounds, realizes accurate screening based on molecular size and affinity, and can be used for separation of real crude oil. The method is simple in preparation process, mild in condition and easy for large-scale production.

This document describes systems and methods for treating and recovering water from feed solutions using a multilayer module with an expansion chamber. The multilayer module comprises a feed spacer layer, a permeate spacer layer and a membrane layer, wherein water vapor evaporated from the feed solution in the feed spacer passes through the membrane layer into the permeate spacer layer. The expansion chamber receives the water vapor from the permeate spacer layer and the feed solution from the feed spacer layer.

This invention relates to certain porous hollow fiber membranes comprising certain PEDEK-PEEK copolymers, to a method for making said porous hollow fiber membranes, to composite membranes comprising a selective layer and their uses in the separation of gases or liquids.

The application discloses a preparation method of high-valence MOF crystal film for organic dehydration and purification. The preparation method is as follows: a porous gamma-Al2O3 carrier is placed in an acetic acid aqueous solution, a solvothermal reaction is carried out to obtain a gamma-AlOOH precursor layer, and then the precursor layer modified carrier is placed in an aqueous solution containing carboxylic acid ligands and hydrated nitrate, and is subjected to secondary growth. The application utilizes a solvothermal method to modify the carrier, pre-sprays a layer of gamma-AlOOH precursor on the surface of the porous gamma-Al2O3 carrier, and then obtains the high-valence crystal film through secondary growth. The prepared porous MOF film material has excellent stability and separation performance in an organic / water system, and is an ideal organic dehydration and purification material.

This invention discloses the preparation of a Janus composite membrane with a sandwich structure and its application in volume reduction of nuclear power plant decontamination wastewater. The Janus composite membrane consists of a hydrogel-like tannic acid / polypropylene glycol (PPG / TA) top layer, a highly adhesive biomimetic intermediate layer formed by polydopamine / polyethyleneimine / chitosan (PDA / PEI / CS), and a hydrophobic polytetrafluoroethylene (PTFE) substrate. Compared with traditional PTFE membranes, when the Janus composite membrane of this invention is applied to volume reduction of nuclear power plant decontamination wastewater, the asymmetric wettability of the Janus composite membrane prevents the foaming liquid of the decontamination wastewater from directly contacting the PTFE substrate and increases the capillary pressure at the membrane-liquid interface, thereby protecting its hydrophobic properties and continuously transporting water vapor. Compared with the monotonous negatively charged layer of the original commercial PTFE membrane, the rich hydrophilic functional groups of the modified layer of the Janus composite membrane further reduce the permeation rate of nuclides and other pollutants, with a nuclide rejection rate of over 99.95% and a permeate recovery rate of over 85%.

The present invention provides a membrane separation device suitable for suppressing the growth of an undesirable microorganism inside the membrane separation device. The membrane separation device includes: a pervaporation membrane that separates a fermented liquid containing a volatile organic compound into a permeated fluid and a non-permeated fluid; a feed space and a permeation space separated from each other by the pervaporation membrane; a feed space inlet for supplying the fermented liquid to the feed space; and a feed space outlet for discharging the non-permeated fluid from the feed space. The feed space inlet is positioned below the feed space outlet.

The present disclosure relates to an apparatus for membrane distillation using a solar absorber, in which in the implementation of a membrane distillation process for producing treated water using a temperature difference between raw water and a coolant, raw water is heated using the solar absorber with improved heat collection efficiency, and through this, the treated water production efficiency of the membrane distillation process is improved, and the apparatus for membrane distillation using a solar absorber according to the present disclosure includes a raw water tank provided with a solar heat absorbing device to supply raw water heated by the solar heat absorbing device to a membrane distillation module, the membrane distillation module that produces treated water from the raw water through a membrane distillation process, and a coolant tank that supplies a coolant to the membrane distillation module and collects the treated water produced by the membrane distillation module, wherein the solar heat absorbing device is provided on an upper surface or a side of the raw water tank.