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High-flux high-desalination-rate mixed matrix reverse osmosis membrane, and preparation method and application thereof

A mixed matrix, reverse osmosis membrane technology, applied in reverse osmosis, semi-permeable membrane separation, chemical instruments and methods, etc., can solve the problems of poor compatibility of inorganic nanomaterials, influence on operation stability, interface defects, etc. Flux, the effect of reducing mass transfer resistance

Active Publication Date: 2019-08-20
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] At present, most of the research on mixed matrix membranes focuses on the use of inorganic nanomaterials for doping, but inorganic nanomaterials are prone to interface defects due to their poor compatibility with polyamides, which has brought serious problems to the long-term operation stability of the membrane. certain influence

Method used

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  • High-flux high-desalination-rate mixed matrix reverse osmosis membrane, and preparation method and application thereof
  • High-flux high-desalination-rate mixed matrix reverse osmosis membrane, and preparation method and application thereof
  • High-flux high-desalination-rate mixed matrix reverse osmosis membrane, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0041] Soak the polysulfone supporting membrane with a size of 20cm×10cm in 50 ml of polyamine aqueous phase solution for 2 minutes, which contains 2wt% m-phenylenediamine, 0.15wt% sodium dodecylsulfonate , 4wt% camphorsulfonic acid, 2wt% triethylamine, after removing excess solution, dry the membrane surface at room temperature. After the membrane surface is dry, soak the above-mentioned polysulfone support membrane in 50 ml of 0.15wt% trimesoyl chloride n-hexane solution to allow interfacial polymerization. The soaking time is 40 seconds, then remove excess solution, and dry in the shade at room temperature Afterwards, heat treatment in a 60°C oven for 5 minutes to obtain No. 1 film. Membrane No. 1 is the control group prepared by the traditional process, according to figure 1 It can be known that the reverse osmosis membrane prepared by the traditional process has a typical nodular structure on the surface of the membrane, and the roughness is relatively large.

example 2

[0043] Add 30 g (about 0.1 mol) PEG600 and 1 g (about 0.006 mol) p-toluenesulfonic acid into a 250 ml three-necked flask. Dissolve 19.2g (0.1mol) of 1,2,4-trimesic anhydride in 50ml of tetrahydrofuran, and slowly drop it into a three-necked flask through a 100ml constant pressure dropping funnel within 2h under stirring at 60°C, and continue stirring for 6h after the addition is complete . The three-necked flask was connected to a mechanical stirrer, nitrogen gas was fed through a water separator, the temperature was raised to 100°C, and the reaction was carried out for 1 hour, then the temperature was raised to 120°C, and the reaction was carried out for 1 hour. After that, 30 ml of DMF was added to the three-necked flask and the temperature was raised to 140°C for 4 hours to obtain the initial product. After the primary product was cooled, it was dialyzed in acetone for 2 days using a dialysis bag with a molecular weight cut-off of 3500, and the dialysis product was dried to...

example 3

[0046] HBPAC preparation process is consistent with example 2.

[0047] Soak the polysulfone supporting membrane with a size of 20cm×10cm in 50 milliliters of polyamine aqueous phase solution for 2 minutes, which contains 2wt% m-phenylenediamine, 0.15wt% sodium dodecylsulfonate, 4wt% camphorsulfonic acid , 2wt% triethylamine. After removing excess solution, dry the membrane surface in the shade at room temperature. After the membrane surface is dry, soak the above-mentioned polysulfone support membrane in 50 ml of n-hexane solution of 0.005wt% HBPAC and 10v / v% trichloromethane to carry out the first interfacial polymerization. The soaking time is 10 seconds to remove excess After solution, dry in the shade at room temperature. After the membrane surface is dried, the polysulfone supporting membrane is soaked in 50 milliliters of 0.15wt% trimesoyl chloride n-hexane solution to make it carry out the second interfacial polymerization. The soaking time is 40 seconds, and then th...

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Abstract

The invention discloses a high-flux high-desalination-rate mixed matrix reverse osmosis membrane, and a preparation method and application thereof. The reverse osmosis composite membrane is composed of a polysulfone supporting membrane and a functional layer; the functional layer is prepared by taking m-phenylenediamine as a water-phase monomer, taking trimesoyl chloride as an oil-phase monomer and taking an acyl chloride group-terminated hyperbranched polymer as a doping material, and the functional layer is polymerized on the supporting membrane through interfacial polymerization. Accordingto the invention, a simple and feasible treatment process is used, and a hyperbranched polymer is selected to be functionalized, so that the hyperbranched polymer can participate in interfacial polymerization. Due to highly dendritic structure of the hyperbranched polymer, the hyperbranched polymer can be used for preparing the mixed matrix reverse osmosis membrane, so that the pore number of a polyamide layer of the mixed matrix reverse osmosis membrane is increased, mass transfer resistance of water is reduced, and thus the water flux of the prepared mixed matrix reverse osmosis membrane isimproved on the basis of maintaining a high salt interception rate.

Description

[0001] (1) Technical field [0002] The invention relates to a membrane material and a preparation method thereof, in particular to a high flux and high desalination rate mixed matrix reverse osmosis membrane, a preparation method and application thereof. [0003] (2) Background technology [0004] Reverse osmosis technology is a membrane process that uses the pressure difference on both sides of the membrane as the driving force and uses the selective permeability of the semi-permeable membrane to achieve separation. It does not involve phase change and has low energy consumption. It plays an important role in the desalination of seawater brackish water and the preparation of pure water and ultrapure water. Reverse osmosis membrane is the core of reverse osmosis technology. The research and application of reverse osmosis membrane has always been the hottest research direction in the field of reverse osmosis technology. [0005] Since reverse osmosis is a pressure-driven separ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/76B01D69/10B01D67/00B01D61/02
CPCB01D61/025B01D67/0002B01D69/10B01D71/76Y02A20/131
Inventor 刘立芬吴昊高从堦
Owner ZHEJIANG UNIV OF TECH
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