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Polyamide composite nanofiltration membrane

A technology of composite nanofiltration membrane and polyamide, which is 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., to achieve The effect of simple preparation method

Active Publication Date: 2011-07-27
浙江易膜新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] 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
  • Polyamide composite nanofiltration membrane
  • Polyamide composite nanofiltration membrane

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0035] Preparation of composite nanofiltration membrane: immerse the wet polysulfone porous support membrane in the aliphatic macromolecular polyamine aqueous solution containing acid receiver for 2-8 minutes, roll the surface of the support membrane with a rubber roller, take out and drain the aqueous solution and use After drying with nitrogen, carry out single-sided interfacial polymerization with an organic solution containing a binary aromatic reactive monomer; the acid receiver is triethylamine, or sodium hydroxide, or sodium carbonate, or trisodium phosphate, with a content of 1.0-4.0wt%; the aliphatic macromolecular polyamine is polyvinylamine (PVAm), the content is 0.5-4.0wt%, the degree of ammonolysis is 0.1-0.9, and the molecular weight is 1000-500,000; the binary aromatic The reaction monomer is isophthaloyl chloride (IPC), or terephthaloyl chloride (TPC), or 2,4-toluene diisocyanate (TDI), and the content is 0.05-0.30wt%; the organic solvent used for the organic so...

Embodiment 1-3

[0043]Use 13.0wt% 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 100,000.

[0044] Immerse the wet polysulfone porous support membrane in an aqueous solution containing 3.0wt% triethylamine and 3.0wt% polyvinylamine (molecular weight = 28,000; degree of ammonolysis a = 0.53) for 5 minutes, and use a rubber roller to support Membrane surface, after draining the aqueous solution and blowing dry the support membrane surface with nitrogen, with 0.2wt% containing dibasic aromatic reaction monomer (respectively isophthaloyl dichloride (IPC), or terephthaloyl dichloride (TPC) , or 2,4-toluene diisocyanate (TDI)) in n-heptane solution was contacted on one side for interfacial polymerization for 120 seconds. The obtained composite m...

Embodiment 4-10

[0047] As in previous examples, according to the above method, an aqueous solution containing 3.0 wt% triethylamine and 0.5-4.0 wt% polyvinylamine (molecular weight=28,000; degree of ammonolysis a=0.53) was used, and 0.18 wt% m-benzene The n-heptane solution of diacid chloride (IPC) is contacted on one side to carry out interfacial polymerization reaction for 0.5-5 minutes to prepare a composite nanofiltration membrane. These examples are to investigate the influence of the weight ratio of polyacetamide in the aqueous solution on the performance of the composite nanofiltration membrane.

[0048]

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Abstract

The invention relates to a polymer separation membrane, in particular to a high-performance polyamide composite membrane. In the invention, an ultra-thin active separating layer is compounded on a porous supporting membrane through interfacial polycondensation between an aqueous solution containing aliphatic macromolecular polyamine and an organic solution containing a dyadic aromatic reaction monomer; the aliphatic macromolecular polyamine is polyvinylamine; the dyadic aromatic reaction monomer is phthaloyl chloride or paraphthaloyl chloride or 2,4-toluene diisocyanate; and the thickness of the active separating layer is 0.02-0.5 mum. The invention has the advantage that a novel high-performance composite nanofiltration membrane which is made of raw materials easy to obtain and has low cost and excellent preferential segregation performance is provided. The high-performance composite nanofiltration membrane provided by the invention has multiple purposes and a simple manufacturing method.

Description

technical field [0001] The invention relates to a polymer separation membrane, in particular to a high-performance polyamide composite 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, materia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/56B01D69/12
Inventor 俞三传刘梅红
Owner 浙江易膜新材料科技有限公司
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