14results about How to "Improve gas separation performance" patented technology

The invention provides a cross-linked turner base polymer, an obtained turner base gas separation membrane and application of the cross-linked turner base polymer, and belongs to the technical field of gas separation membranes. The cross-linked turger base polymer is prepared from at least one diamine monomer and a derivative thereof, or at least one polyamine monomer and a derivative thereof, or a homopolymer or a copolymer formed by polymerizing at least one diamine monomer and a derivative thereof and at least one polyamine monomer and a derivative thereof is reacted with dimethoxymethane and trifluoroacetic acid. The polymer can be subjected to one-step in-situ crosslinking to form a membrane in the polymerization process, and the obtained membrane has excellent gas separation performance, has high permeability to O2, H2 and the like, has low permeability to N2 and CH4, and can be used for air oxygen enrichment, in-situ nitrogen generation, hydrogen concentration, hydrogen-methane separation and the like.

The invention discloses a KAUST-7-NH2 / PIM-1 mixed matrix membrane as well as a preparation method and application of the KAUST-7-NH2 / PIM-1 mixed matrix membrane. The mixed matrix membrane comprises a self-polymerized microporous polymer (PIM-1) and amino modified KAUST-7 (KAUST-7-NH2) filled in the matrix membrane. The KAUST-7-NH2 is filled into the PIM-1 solution to prepare a membrane casting solution, and the membrane casting solution is dried by a solution evaporation method to form the membrane. According to the present invention, the compatibility between KAUST-7-NH2 and PIM-1 is improved by introducing the amino group, the mechanical property of the membrane is significantly improved, the exposure of a large amount of CO2 adsorption active sites is promoted, the preferential adsorption of CO2 is enhanced, the CO2 permeability of the mixed matrix membrane is enhanced, and the CO2 / CH4 selectivity (PCO2 gt, 3219 Barrer, alphaCO2 / CH4 gt, 32.1) is improved; the preparation method provided by the invention is simple and easy to operate, and the prepared KAUST-7-NH2 / PIM-1 mixed matrix membrane has higher gas separation performance on the basis of excellent aging resistance and plasticizing resistance, and can be applied to efficient separation of CO2 / CH4.

The invention discloses a uniformly-distributed defect-free c-PIMs / MOFs composite membrane as well as a preparation method and application thereof, and belongs to the technical field of gas separation membrane technology separation. The MOFs / PIMs composite membrane is a homogeneous membrane and comprises a modified PIMs matrix and MOFs nanoparticles, the MOFs nanoparticles are uniformly embedded into the modified PIMs matrix, and the MOFs / PIMs composite membrane is formed by compounding a modified PIMs chain segment structure and a MOFs / PIMs cross-linked structure; the PIMs matrix in the composite membrane has continuous cavities, and the MOFs have regular pore channels. Firstly, a modified polymer PIMs is prepared; secondly, preparing an MOFs seed crystal solution; and finally, carrying out heat treatment on the PIMs / MOFs membrane casting solution through a solvent evaporation method to prepare the c-PIMs / MOFs composite membrane. On the basis of the concept of solvent volatilization, the gas separation performance and long-term stability of the PIMs composite membrane are improved by optimizing solvent volatilization conditions and regulating and controlling the interfacial compatibility between PIMs and MOFs; the interfacial compatibility between PIMs-MOFs can be improved, non-selective defects are avoided, and formation of a defect-free composite membrane is promoted; selective rapid transfer of gas can be achieved, and preparation of the evenly-distributed defect-free composite membrane is further achieved.

The invention discloses a polyimide hollow fiber gas separation membrane and a preparation method thereof, and the polyimide hollow fiber gas separation membrane is prepared by reasonably designing a precursor structure and accurately regulating spinning parameters. The prepared polyimide hollow fiber gas separation membrane is compact in surface, free of holes and defects and excellent in mechanical property, and has a high-flux and high-selectivity gas separation effect, especially for hydrogen. Wherein the hollow fiber spinning solution is obtained by mixing a polyimide polymer, a high-boiling-point solvent, a low-boiling-point solvent and a non-solvent, and the polyimide polymer is synthesized by carrying out condensation polymerization on a dianhydride monomer, a diamine monomer containing a benzimidazole group and other diamine monomers. The preparation method provided by the invention is simple, convenient and easy to operate, avoids tedious procedures and additional economic investment brought by subsequent processes (polydimethylsiloxane coating and crosslinking modification), and has a wide application prospect.

The application relates to a high-strength high-separation-performance carbon molecular sieve hollow fiber membrane and a preparation method and application thereof, and the preparation method comprises the following steps: (1) mixing cellulose acetate, cellulose, an organic solvent and an ionic liquid to prepare a casting solution, and stirring and heating the casting solution; (2) vacuumizing and defoaming the casting solution, and preparing a hollow fiber cellulose acetate membrane by using a dry-wet spinning method; and (3) drying the hollow fiber cellulose acetate membrane, and preparing the high-strength high-separation-performance carbon molecular sieve hollow fiber membrane by carbonizing under temperature rise in a protective atmosphere. Compared with the prior art, the carbon molecular sieve hollow fiber membrane has good gas separation performance and high strength. The carbon molecular sieve membrane is used for He / CH4 separation, has high He permeation performance and a high He / CH4 separation factor, has good gas separation performance under high pressure, and provides a new choice for natural gas helium extraction membrane materials.

The invention relates to the technical field of conjugated microporous polymer materials, and discloses a covalent triazine unit-based conjugated microporous polymer membrane with negative charges and a preparation method thereof. The method comprises the following steps: firstly, preparing a negatively charged cyanophenyl monomer through nucleophilic substitution reaction of a cyanophenyl-containing compound and 1, 4-butane sultone, then taking the monomer and biphenyl nitrile as comonomers, and carrying out step-by-step polymerization, heating film formation, shock cooling shaping and dual-solvent soaking post-treatment under the catalysis of trifluoromethanesulfonic acid to obtain the cyanophenyl-containing polymer film. And finally obtaining the covalent triazine unit-based conjugated microporous polymer membrane with negative charges. The preparation process is high in controllability, and the obtained film has high stability of a covalent triazine structure and the porous characteristic and negative charge function of conjugated micropores, and has wide application prospects in the fields of gas separation and the like through verification.

The invention relates to the technical field of gas separation, in particular to a hollow fiber supported carbon molecular sieve composite membrane and a preparation method thereof.The preparation method comprises the steps that firstly, a dianhydride-based polyimide dip-coating solution is prepared, then a balance weight is added to the tail end of a hollow carbon fiber base material, and the top end of the hollow carbon fiber base material is connected with dip-coating equipment; the hollow carbon fiber base material is kept vertical and slowly immersed in the dianhydride-based polyimide dip-coating solution, meanwhile, a protective cover is arranged between a container opening of the dianhydride-based polyimide dip-coating solution and the dip-coating equipment, then the hollow carbon fiber base material obtained after dip-coating is dried, and the balance weight is removed; the hollow fiber supported carbon molecular sieve composite membrane is obtained. The dianhydride-based polyimide dip-coating solution is uniformly distributed on the surface of the hollow fiber base material, and the carbon molecular sieve composite membrane is good in morphology, has excellent gas separation performance and has a wide application prospect in the field of gas separation.

The invention discloses a preparation method of a benzoxazole-polyimide copolymer gas separation membrane, which comprises the following steps: a solvent and two aromatic diamines are added into a flask, one aromatic diamine is hydroxyl-containing aromatic diamine; adding dianhydride after dissolving, and reacting to generate a hydroxyl polyamide acid solution; filtering the hydroxyl polyamide acid solution in a filter, pouring on a tool plate, drying, performing thermal imidization in a drying oven, and cooling to obtain a hydroxyl polyimide-polyimide copolymer film; and placing the hydroxyl polyimide-polyimide copolymer film in a tubular furnace, and carrying out thermal rearrangement reaction in an argon atmosphere to generate the benzoxazole-polyimide copolymer film. According to the gas separation membrane obtained by the method, the gas permeability is remarkably improved, and the carbon dioxide separation capability is improved.

This application relates to the field of capacitor technology, specifically disclosing an environmentally friendly capacitor insulating oil and its preparation method. The environmentally friendly capacitor insulating oil comprises polyol esters and hydroxyl acrylates, wherein the molar ratio of hydroxyl groups in the polyol esters to those in the hydroxyl acrylates is 1–2:1–2. This application introduces small-molecule hydroxyl acrylates to reduce the intermolecular forces of the polyol esters, thereby improving the low-temperature fluidity of the insulating oil. Simultaneously, the small-molecule hydroxyl acrylates also provide free radical trapping sites, effectively improving the gas evolution performance, antioxidant stability, and electrical properties of the insulating oil under extreme low-temperature conditions. This solves the technical problem of existing insulating oils being unable to simultaneously achieve low-temperature fluidity, insulation, and environmental friendliness.

This invention belongs to the field of membrane material technology, and particularly relates to a six-membered ring polyimide copolymer separation membrane, its preparation method, and its applications. This invention utilizes naphthalene dianhydride copolymerized with rigid diamine monomers such as BAPF and TrMPD. The rigid structure of the naphthalene ring and fluorene ring on the main chain, with their high electron cloud density, improves the gas separation performance of the polymer membrane. The six-membered ring polyimide obtained through this method exhibits excellent gas separation performance for CO2. 2 / N 2 The separation effect of the mixed gas is better than the test results in the pure gas, indicating its broad application prospects in the field of exhaust gas treatment.

This invention discloses an anion-pillared ultraporous membrane, its preparation method, and its application in the separation of low-carbon hydrocarbons. The ultraporous membrane exhibits stable properties and excellent separation selectivity and permeation flux. Preparation method: A polymer with hydrogen-bonded groups is spin-coated onto a substrate, dried to form a film, the substrate is modified, and then an inorganic anion-pillared ultraporous material layer is grown in situ on the substrate surface to obtain the ultraporous membrane. The inorganic anion-pillared ultraporous material layer is formed by the self-assembly of metal ions, inorganic anions, and flexible ligands through coordination bonds; the metal ion is Cu. 2+ Zn 2+ At least one of the following; the inorganic anion is SiF6. 2‑ GeF6 2‑ At least one of the following; the flexible ligand is at least one of 4,4'-bipyridine sulfide and 4,4'-bipyridine sulfoxide.

The invention relates to the technical field of separation membranes, and particularly discloses a preparation process of a self-supporting gas separation membrane prepared from a polymer-assisted monolithic metal organic framework. Comprising the following specific steps: S1, uniformly mixing defective metal organic framework particles with a metal salt, a ligand and triethylamine, pressing the mixture into a wafer, and then putting the wafer into a reaction kettle for heating reaction to obtain MOFsp1; s2, uniformly mixing a metal salt, a ligand and triethylamine, re-pressing the mixture and the MOFsp1 prepared in the step 1 into a new wafer, and putting the new wafer into a reaction kettle for heating reaction to obtain MOFsp2; repeating the operation to prepare the self-supporting integral metal organic framework; s3, washing and drying the self-supporting monoblock metal organic framework prepared in the step 2 by using N, N-dimethylformamide and methanol respectively, then soaking the self-supporting monoblock metal organic framework in a polydimethylsiloxane solution, and drying the self-supporting monoblock metal organic framework to prepare the self-supporting gas separation membrane; the gas separation membrane prepared by the invention has relatively high gas separation performance.

The invention provides a cellulose-based carbon film and a preparation method thereof, and relates to the technical field of gas separation films. The preparation method of the cellulose-based carbon film comprises the following steps: dissolving cellulose in a solvent to prepare a cellulose solution, then carrying out film forming treatment on the cellulose solution, and then purifying, pre-oxidizing, carbonizing and activating in sequence to obtain the cellulose-based carbon film. The cellulose-based carbon film provided by the invention is prepared by the preparation method. According to the preparation method provided by the invention, the raw materials are rich in stock, low in price and renewable, so that the overall preparation cost is low, the problem that the preparation cost of the carbon film in the prior art is too high is solved, the process is simple, the condition is safe and controllable, the defects of cracks, bubble scars and the like of the prepared carbon film caused by repeated carbonization are avoided, and the method is suitable for industrial production. On the premise that the separation performance of the carbon film is guaranteed, the comprehensive performance of the carbon film is improved, the cellulose-based carbon film with the advantages of high selectivity, high permeability, high separation capacity and high stability is obtained, and the cellulose-based carbon film has very objective industrial value.

The invention provides an ionic liquid modified MOF gel (MOF gel) mixed matrix membrane (MMMs) for efficient carbon dioxide separation and a preparation method thereof. The ionic liquid and the MOF gel material are combined, and the gas separation performance of the membrane is remarkably improved through the synergistic effect of the ionic liquid and the MOF gel material. The ionic liquid has high polarity and selective adsorption capacity on CO2, so that the CO2 permeability and selectivity of the membrane are greatly improved. Meanwhile, the three-dimensional interconnection network structure of the MOF gel enhances the dispersity of the material, constructs a continuous penetrating channel, effectively promotes gas transmission, and improves the long-term stability of the film. After the two are combined, the membrane material not only has a more excellent gas separation effect, but also has mechanical strength and operation stability. The preparation method is simple and convenient to operate, is suitable for large-scale industrial production, has the advantages of energy conservation and environmental protection, and particularly has wide application potential in the field of carbon dioxide capture and separation.