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High-throughput polyamide reverse osmosis composite membrane

A reverse osmosis composite membrane and polyamide technology, applied in reverse osmosis, semi-permeable membrane separation, osmosis/dialysis water/sewage treatment, etc. The effect of high water content and simple preparation method

Inactive Publication Date: 2011-07-27
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In US Patent 4,761,234 in 1988, Uemura et al. used the interfacial polycondensation process to react and compound a layer of aromatic polyamide film on the porous polysulfone support membrane through the interfacial polymerization between trimellitamine and isophthaloyl chloride to prepare Reverse osmosis composite membrane, the membrane desalination rate is greater than 99.0%, but it is difficult to obtain the phenylenediamine used

Method used

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  • High-throughput polyamide reverse osmosis composite membrane
  • High-throughput polyamide reverse osmosis composite membrane
  • High-throughput polyamide reverse osmosis composite membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-8

[0042] Use 13.5wt% 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 porous support membrane with a molecular weight cut-off of 100,000-120,000, which is stored in a wet state for future use.

[0043] Immerse one side of the wet polysulfone porous support membrane into aromatic polyamines (respectively m-phenylenediamine, or 4-chloro-m-phenylenediamine, or 4-nitro-m-phenylenediamine, or 2,4-di Aminotoluene) and aliphatic macromolecular polyamine polyamine polyethyleneamine (molecular weight = 30,000; degree of ammonolysis a = 0.52) in an aqueous solution with a total content of 2.0 wt% for 4 minutes, use a rubber roller to roll the surface of the support film, and drain the aqueous solution After drying the surface of the support film with nitrogen, contact with 0.08wt% trimesoyl chloride (TMC) n...

Embodiment 9-14

[0047] As in the preceding examples, according to the method described above, an aqueous solution with a total content of 2.4 wt% of m-phenylenediamine and polyvinylamine (molecular weight=30,000; degree of ammonolysis a=0.52) and 0.05 wt% of aromatic multi-acid chloride ( Trimesoyl chloride (TMC), or 5-isocyanate-isophthaloyl chloride (ICIC), or 5-oxoformyl chloride-isophthaloyl chloride (CFIC)) in n-heptane to prepare reverse osmosis composite membranes. These several examples are to investigate the effect of adding aliphatic macromolecular polyamine polyamine on the properties of films formed from different polybasic acid chlorides.

[0048]

[0049] The above examples show that: adding aliphatic macromolecular polyamine polyvinylamine to the aqueous phase solution of aromatic polyamines can significantly improve the reverse osmosis composite rate formed by different polyacyl chlorides under the premise of keeping the membrane desalination rate almost unchanged. membrane...

Embodiment 15-21

[0051] As in the previous examples, according to the above method, the total content of m-phenylenediamine and polyvinylamine (molecular weight=30,000; degree of ammonolysis a=0.52) is 1.2wt%, and different m-phenylenediamine and polyvinylamine weight ratios are used. aqueous solution, and 0.12wt% trimesoyl chloride (TMC) n-heptane solution to prepare a reverse osmosis composite membrane. These several examples are to investigate the effect of the weight ratio of aromatic polyamines and aliphatic macromolecular polyamines in the aqueous phase solution on the film-forming properties.

[0052] Example

[0053] The above examples show that a high-flux reverse osmosis composite membrane can be obtained by adding aliphatic macromolecular polyamine polyvinylamine to the aqueous phase solution of aromatic polyamine, but too high polyvinylamine content will lead to a decrease in membrane desalination rate.

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Abstract

The invention relates to a highly-molecular separation membrane, in particular to a high-throughput polyamide reverse osmosis composite membrane. In the high-throughput polyamide reverse osmosis composite membrane, a polyamide ultra-thin functional layer is compounded on a porous supporting membrane by interfacial polycondensation between water solutions of aromatic polyamine and aliphatic macromolecular polyamine and a solution of aromatic poly-acyl chloride, wherein the aromatic polyamine at least comprises one of metaphenylene diamine, 4-chloro metaphenylene diamine, 4-nitryl metaphenylenediamine and 2,4-diaminotoluene; the aromatic poly-acyl chloride is trimesoyl chloride, 5-isocyanate-isophthaloyl chloride or 5-chloroformloxy-isophthaloyl chloride; and the aliphatic macromolecular polyamine is polyvinylamine. The reverse osmosis composite membrane has the advantages of readily available raw materials, low cost, high desalination rate and high throughput. The novel high-throughput polyamide reverse osmosis composite membrane is wide in application and the preparation method is simple.

Description

technical field [0001] The invention relates to a polymer separation membrane, in particular to a novel high-flux polyamide reverse osmosis composite membrane. technical background [0002] Reverse osmosis technology is a high-efficiency, energy-saving green separation technology with outstanding features such as simple equipment, mild operating conditions, large processing capacity, and high separation efficiency. , environmental engineering, food, medicine and other fields have been widely used, and have achieved good economic and social benefits; in recent years, with the increasing shortage of global water resources and water pollution, reverse osmosis technology has The field of reuse has been more widely used and valued. The core of reverse osmosis technology is reverse osmosis membrane. Asymmetric reverse osmosis membrane and reverse osmosis composite membrane are two types of high-performance reverse osmosis membranes that have been commercially used at present, and...

Claims

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Application Information

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IPC IPC(8): B01D71/56B01D69/12B01D61/02C02F1/44
CPCY02A20/131
Inventor 俞三传刘梅红
Owner ZHEJIANG SCI-TECH UNIV
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