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Polyamide composite nanofiltration membrane and preparation method thereof

A composite nanofiltration membrane and polyamide technology, which is applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc. Simple preparation method

Active Publication Date: 2011-08-17
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

[0012] 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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  • Polyamide composite nanofiltration membrane and preparation method thereof
  • Polyamide composite nanofiltration membrane and preparation method thereof
  • Polyamide composite nanofiltration membrane and preparation method thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0037] Preparation of composite nanofiltration membrane: Immerse the wet polysulfone porous support membrane in the polyamine aqueous solution containing acid receiver for 1-10 minutes, roll the surface of the support membrane with a rubber roller, take out the aqueous solution and dry it with nitrogen , carry out single-sided interfacial polymerization reaction with polyacyl chloride solution; wherein the acid receiving agent is triethylamine, or sodium hydroxide, or sodium carbonate, or trisodium phosphate, and the content is 0.5-4wt%; wherein the polyamine is aliphatic Macromolecular polyamine polyvinylamine, the content is 1.0-3.0wt%, the degree of ammonolysis is 0.1-0.9, and the molecular weight is 1000-500,000; the polyacyl chloride is trimesoyl chloride, or 5-isocyanate-isophthaloyl chloride, or 5-oxoformyl chloride-isophthaloyl chloride, the content is 0.05-0.20wt%; the organic solvent used for multi-acyl chloride solution is Isopar G , or trifluorotrichloroethane, or ...

Embodiment 1-7

[0045] Use 13.5wt% Udel PS3500 polysulfone, 0.25wt% 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 a molecular weight cut-off of 80,000-100,000.

[0046] Immerse one side of the wet polysulfone porous support membrane into an aqueous solution containing 3.0wt% triethylamine and 1.0-3.0wt% aliphatic macromolecular polyamine polyethyleneamine (molecular weight=28,000; degree of ammonolysis a=0.53) For 5 minutes, roll the surface of the support film with a rubber roller, drain the aqueous solution and blow dry the surface of the support film with nitrogen, and mix with 0.1wt% polyacyl chloride (respectively trimesoyl chloride (TMC), or 5-isocyanate-iso Phthaloyl chloride (ICIC), or 5-oxoformyl chloride-isophthaloyl chloride (CFIC) n-hexane solution single-sided contact for interfacial poly...

Embodiment 8-14

[0049] As in previous examples, according to the method described above, the acid receiver containing 0.5-4.0wt% (respectively triethylamine, or sodium hydroxide, or sodium carbonate, or trisodium phosphate) and 2.0wt% aliphatic macromolecular Molecular polyamine polyvinylamine (molecular weight=28,000; degree of ammonolysis a=0.53) aqueous solution, trimesoyl chloride (TMC) weight ratio is an organic solvent of 0.1wt% (respectively Isopar G , or trifluorotrichloroethane, or n-hexane, or heptane, or dodecane) solution to prepare composite nanofiltration membrane. These several examples are to investigate the impact of acid receiver and its content, organic solvent on membrane performance.

[0050]

[0051]

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Abstract

The invention relates to a polymer separation membrane, in particular to a polyamide composite nanofiltration membrane and a preparation method thereof. A polyamide ultra-thin functional layer is compounded on a porous support membrane through interfacial polycondensation between aliphatic macromolecular polyamine and poly(acyl chloride). The preparation method comprises the following steps: directly immersing the porous support membrane into aliphatic macromolecular polyamine water solution, using a rubber roller to roll the surface of the support membrane, taking out, draining the water solution, blow-drying with nitrogen, performing single-side interfacial polymerization reaction with poly(acyl chloride) solution only on the surface of the porous support membrane, shade-drying the composite membrane in the air, and further performing heat treatment and rinsing for getting the composite nanofiltration membrane. The invention provides the novel polyamide composite nanofiltration membrane which is easy to get raw materials, low in price and excellent in selective separation performance and the preparation method thereof. The novel polyamide composite nanofiltration membrane has a wide range of applications, and the manufacturing method is simple.

Description

technical field [0001] The invention relates to a polymer separation membrane, in particular to a polyamide composite nanofiltration membrane and a preparation method thereof. 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, drink...

Claims

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Application Information

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IPC IPC(8): B01D71/56B01D67/00B01D69/10B01D69/12
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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