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High-flux composite nanofiltration membrane

A composite nanofiltration membrane and high-flux technology, applied in membrane technology, semi-permeable membrane separation, chemical instruments and methods, etc., can solve problems such as low performance, single type of composite nanofiltration membrane, and inability to meet practical application requirements, etc. Achieve the effect of simple preparation method, good anti-pollution performance and good hydrophilicity

Inactive Publication Date: 2012-04-25
杭州奈诺膜环境技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] However, the current commercial production of composite nanofiltration membranes still has problems such as single variety, low performance, and inability to meet the needs of practical applications.

Method used

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  • High-flux composite nanofiltration membrane

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0026] Preparation of composite nanofiltration membrane: immerse the wet polysulfone porous support membrane in the aqueous solution containing acid receiver and aliphatic macromolecular polyamine for 0.5-10 minutes, roll the surface of the support membrane with a rubber roller, take out and drain the aqueous solution And after blowing dry with nitrogen, carry out single-sided interfacial polymerization reaction with organic solution containing aromatic polyacyl chloride; the acid receiver is triethylamine, or sodium hydroxide, or sodium carbonate, or trisodium phosphate, the content is 0.5-3.0 wt%; the aliphatic macromolecular polyamine is sericin, the content is 0.2-6.0wt%; the aromatic polyacyl chloride is trimesoyl chloride, or 5-isocyanate-isophthaloyl chloride, or 5-oxoformyl chloride -isophthaloyl chloride, or isophthaloyl chloride, or terephthaloyl chloride, or 2,4-diisocyanate toluene, the content is 0.02-0.50wt%; wherein the organic solvent used in the organic solutio...

Embodiment 1-6

[0034] Use 12.0wt% Udel PS3500 polysulfone, 0.2wt% water and 0.1wt% nonylphenol polyoxyethyl ester phosphate dissolved in N,N-dimethylformamide, and scrape on the polyester non-woven fabric and then immersed in water to remove the solvent to obtain a polysulfone porous support membrane with an average pore size of 0.020 μm.

[0035] Immerse the wet polysulfone porous support membrane in an aqueous solution containing 1.0wt% sodium hydroxide and 3.0wt% sericin for 5 minutes, roll the surface of the support membrane with a rubber roller, drain the aqueous solution and blow the surface of the support membrane with nitrogen After drying, mix with containing 0.2wt% aromatic polyacyl chloride (respectively trimesoyl chloride, or 5-isocyanate-isophthaloyl chloride, or 5-oxoformyl chloride-isophthaloyl chloride, or isophthaloyl chloride, or terephthaloyl dichloride Formyl chloride, or 2,4-diisocyanate toluene) organic solution (the organic solvent is trifluorotrichloroethane, or n-hex...

Embodiment 7-12

[0039] As in the preceding examples, according to the method described above, the polysulfone porous support membranes with different pore sizes prepared by polysulfone membrane-making liquids with different concentrations are used to pass through the aqueous solution containing 1.0wt% sodium hydroxide and 3.0wt% sericin, and 0.2wt% trimesoyl chloride in n-heptane solution was subjected to interfacial polymerization for 180 seconds to prepare a composite nanofiltration membrane. These several examples are to investigate the effect of the pore size of the porous support membrane on the performance of the composite nanofiltration membrane.

[0040]

[0041] From the data in the above table, it can be seen that there is a corresponding positive proportional relationship between the pore size of the porous support membrane and the water flux.

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Abstract

The invention relates to a macromolecular separation membrane, and in particular relates to a high-flux composite nanofiltration membrane. An ultrathin active separation layer is compounded on a porous support membrane through interfacial polycondensation between the aqueous solution containing aliphatic macromolecular polyamine and an organic solution containing aromatic polyacyl chloride; the aliphatic macromolecular polyamine is sericin with concentration of 0.2-6.0wt%; and the aromatic polyacyl chloride is trimesoyl chloride or 5-isocyanate-isophthalyl chloride or 5-oxyformyl chloride-isophthalyl chloride or phthaloyl chloride or paraphthaloyl chloride or 2,4-toluene diisocyanate, with concentration of 0.5-4.0wt%. The invention provides a novel high-flux composite nanofiltration membrane which has the advantages that: the raw materials are easily available, the cost is low, the selective separation performance is good, and the penetration flux is high. The high-flux composite nanofiltration membrane provided by the invention is widely applicable, and the manufacturing method is simple.

Description

technical field [0001] The invention relates to a polymer separation membrane, in particular to a high-flux composite nanofiltration membrane. technical background [0002] Nanofiltration membrane is a new type of separation membrane with a pore size between reverse osmosis membrane and ultrafiltration membrane. Due to its nano-scale membrane pore size and multiple charges on the membrane, it allows low-molecular salts to pass through and intercepts higher-molecular-weight organic substances. and multivalent ions, with unique separation performance and higher separation accuracy. Compared with other separation membranes, nanofiltration membranes have the characteristics of larger membrane flux, low process osmotic pressure, selective separation of ions, low operating pressure, and low power requirements of the system. At present, nanofiltration membrane technology has been widely used in water softening and brackish water desalination, drinking water purification, material ...

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D71/68
Inventor 俞三传刘梅红
Owner 杭州奈诺膜环境技术有限公司
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