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Crosslinked hyperbranched polyalcohol composite nano filter membrance and method of preparing the same

A technology of composite nanofiltration membrane and polysulfone ultrafiltration membrane, which is applied in the field of polyester composite nanofiltration membrane and its preparation, can solve the problems of unsatisfactory flux and rejection rate of polyester composite membrane, and achieve a good industrial production basis, Broad application prospects and low operating pressure

Inactive Publication Date: 2008-09-03
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] However, the composite reverse osmosis membrane prepared with this bisphenol monomer has no functional monomer in the functional skin layer, so the flux and rejection rate of the prepared polyester composite membrane are not ideal.

Method used

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  • Crosslinked hyperbranched polyalcohol composite nano filter membrance and method of preparing the same
  • Crosslinked hyperbranched polyalcohol composite nano filter membrance and method of preparing the same
  • Crosslinked hyperbranched polyalcohol composite nano filter membrance and method of preparing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-3

[0032] A polysulfone ultrafiltration membrane with a molecular weight cut-off of 20,000-30,000 was selected as the supporting membrane.

[0033] Immerse the wet polysulfone support membrane into the concentration of triethanolamine is 5 ~ 7wt / v%, sodium lauryl sulfate is 0.3wt / v%, NaOH / Na 2 CO 3 (mass ratio 1: 2) was in the aqueous solution of 0.6wt / v% for 30 minutes, after taking it out, roll the surface of the supporting film with a rubber roller, squeeze it dry and carry out Interfacial polymerization was carried out for 35 minutes. After the composite film was naturally dried in air for 1 minute, it was heat-treated in an oven at 60°C for 30 minutes. After being rinsed several times with deionized water, the polyester composite nanofiltration membrane is obtained. The prepared composite membrane was stored in water, and its desalination performance was tested under the condition of 5mmol / L magnesium sulfate aqueous solution and operating pressure of 0.6MPa.

[0034] Th...

Embodiment 4-6

[0038] As in Example 1-3, according to the above method, the concentration ratio of triethanolamine is 5wt / v%, sodium lauryl sulfate is 0.3wt / v%, and NaOH / Na 2 CO 3 (mass ratio 1:2) 0.6wt / v% aqueous solution and trimesoyl chloride concentration 0.2-0.4wt / v% n-hexane solution carry out interfacial polymerization to prepare composite nanofiltration membrane. The prepared composite membrane was stored in water, and its desalination performance was tested under the condition of 5mmol / L magnesium sulfate aqueous solution and operating pressure of 0.6MPa.

[0039] These several examples are to investigate the effect of the concentration of trimesoyl chloride, a monomer in the organic phase, on the performance of the membrane.

[0040]

[0041] It can be seen from Examples 4-6 that the concentration of trimesoyl chloride has almost no effect on the membrane performance, so a lower concentration of trimesoyl chloride can be used to prepare this type of composite nanofiltration mem...

Embodiment 7-10

[0043] As in Example 1-3, according to the above method, the concentration of triethanolamine is 6wt / v%, sodium lauryl sulfate is 0.3wt / v%, NaOH / Na 2 CO 3 (Mass ratio 1:2) 0.6wt / v% aqueous solution and trimesoyl chloride concentration 0.2wt / v% n-hexane solution were interfacially polymerized to prepare a composite nanofiltration membrane. The prepared composite membrane was stored in water, and its desalination performance was tested under the condition of 5mmol / L brine solution and operating pressure of 0.6MPa.

[0044] These several examples are to investigate the desalination performance of polyester composite nanofiltration membranes to different salts.

[0045]

[0046] From Examples 7-10, it can be seen that this type of polyester composite nanofiltration membrane has a higher desalination rate for electrolyte solutions containing divalent anions, but a lower desalination rate for electrolyte solutions containing monovalent anions, so this type of polymer nanofiltratio...

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Abstract

The invention belongs to the membrane technology field, in particular to a polyester composite nanofiltration membrane as well as the manufacturing method thereof. The composite membrane is characterized in that a layer of aromatic polyester functional cortex is compounded on a porous supporting membrane through multivariate alcohol amine and multivariate acyl chloride interfacial polymerization. The novel polyester composite nanofiltration membrane of the invention has low operating pressure, and the adopted multivariate alcohol amine has the advantages of innocuity, low price, easy availability, etc. Besides, as the functional cortex contains tertiary amine and carboxylic groups, the membrane surface can present different charge properties through adjusting the pH value of separated feed liquid, thereby being applicable to more industrial requirements. Furthermore, the production cost is low, the industrial production basis is good, and the application prospect is wide.

Description

technical field [0001] The invention belongs to the field of membrane technology, and in particular relates to a polyester composite nanofiltration membrane and a preparation method thereof. Background technique [0002] The main methods for preparing nanofiltration membranes are: phase inversion method and composite method. Compared with the asymmetric membrane prepared by the phase inversion method, the composite membrane has many advantages: since the skin layer and the support layer are made of different materials, each layer can be tailored to achieve the best performance, and the functional skin layer can be Optimized to the ideal permselectivity, the support membrane can achieve the best strength and pressure tightness. In addition, composite membranes can form ultra-thin films for materials that are difficult to form asymmetric membranes. For example, due to solvent limitations and cross-linked polymers, composite membranes can be formed by in-situ polymerization or...

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D71/48B01D71/68
Inventor 汤蓓蓓武培怡
Owner FUDAN UNIV
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