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A kind of preparation method of supramolecular composite separation membrane

A separation membrane and supramolecular technology, applied in the field of separation membranes, can solve problems such as molecular weight proximity, and achieve the effects of simple operation, easy control of the reaction process, and reduction of mass transfer limitations.

Active Publication Date: 2017-12-19
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the selectivity of membrane technology separation is mainly achieved by the molecular weight cut off. Most commercial membranes, such as ultrafiltration membranes, microfiltration membranes and reverse osmosis membranes, cannot achieve the selective separation of individual substances, but natural products, drugs Or some chemical products, the molecular weight is relatively close, so it is difficult to use the existing membrane technology for accurate separation, so improving the selectivity of the membrane and making the membrane separation achieve accurate separation is one of the difficult problems faced by the current membrane technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0029] The preparation method of the supramolecular composite separation membrane of the present invention uses the existing commercial membrane with a support layer as the base membrane, introduces epoxy groups through surface grafting, and then immobilizes the cyclodextrin supramolecular structure to form a supramolecular structure with The cortex of molecular recognition function, to obtain a large flux and high selectivity molecular recognition composite membrane,

[0030] The existing commercial membranes with a support layer are commercially available polymer separation membranes, including ultrafiltration membranes and microfiltration membranes.

[0031] In the cyclodextrin molecule, each glucose unit contains 5 chiral carbon atoms, and the cyclodextrin molecule composed of m glucose units will have 5m chiral centers. For example, β-cyclodextrin contains 35 chiral carbon atoms atom. Therefore, cyclodextrin molecules, as host molecules, can provide a good rare asymmetri...

Embodiment 1

[0046] Take a commercially available polypropylene separation membrane and immerse it in an ethanol solution of photoinitiator benzophenone with a concentration of 0.5 mol / L, take it out after 1 hour and let it dry naturally, then immerse the membrane in a concentration of 3.0 mol / L methacrylic acid ring In the ethyl acetate solution of oxypropyl ester, react under ultraviolet light with a wavelength of 365nm for 20 minutes, take it out, wash and dry, and obtain a polypropylene separation membrane grafted with epoxy groups on the surface.

[0047] Dissolve α-cyclodextrin in N,N-dimethylformamide (DMF) to prepare a solution with a concentration of 0.1mol / L, then add catalyst sodium hydride to activate for 2 hours to obtain a supramolecular solution, and add sodium hydride The molar ratio to α-cyclodextrin is 0.5:1.

[0048] Submerge the prepared polypropylene separation membrane with epoxy groups in the supramolecular solution, raise the temperature to 60° C. to react for 2 hou...

Embodiment 2

[0051] Take a commercially available polysulfone separation membrane and immerse it in an ethanol solution of photoinitiator benzophenone with a concentration of 0.1mol / L, take it out after 1 hour and let it dry naturally, and then immerse the membrane in a methacrylic acid ring with a concentration of 1.0mol / L. In the ethanol solution of oxypropyl ester, react under ultraviolet light with a wavelength of 365nm for 20 minutes, take it out, wash and dry, and prepare a polysulfone separation membrane with epoxy groups grafted on the surface.

[0052] Dissolve the mixture of α-cyclodextrin and γ-cyclodextrin in dimethyl sulfoxide (DMSO) to prepare a solution with a concentration of 0.05mol / L, and then add catalyst boron trifluoride-ether to activate for 1 hour to obtain For the supramolecular solution, the molar ratio of added boron trifluoride-diethyl ether to cyclodextrin is 0.7:1.

[0053] Submerge the prepared polysulfone separation membrane with epoxy groups in the supramole...

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Abstract

The invention relates to the technical field of separation membranes, in particular to a method for preparing a supramolecular composite separation membrane. The existing commercial membrane with a support layer is used as a base membrane, and epoxy groups are introduced through surface grafting and then immobilized. The supramolecular structure of cyclodextrin forms a cortex with molecular recognition function to obtain a molecular recognition composite membrane with large flux and high selectivity. The existing commercial membranes with supporting layers are ultrafiltration membranes and microfiltration membranes. The preparation method of the supramolecular composite separation membrane of the present invention can be made into a composite membrane with molecular recognition function, the method is easy to operate, and is suitable for industrial scale-up.

Description

technical field [0001] The invention relates to the technical field of separation membranes, in particular to a preparation method of supramolecular composite separation membranes. In particular, it refers to a preparation method of a polymer composite separation membrane based on the supramolecular action of cyclodextrin. Background technique [0002] Membrane separation technology has many advantages, such as no phase change in the separation process, low energy consumption, large separation coefficient, continuous operation, high efficiency, no secondary pollution, low operating temperature, simple device and easy operation. One of the unit operations with the most development potential. [0003] At present, the selectivity of membrane technology separation is mainly achieved by the molecular weight cut off. Most commercial membranes, such as ultrafiltration membranes, microfiltration membranes and reverse osmosis membranes, cannot achieve the selective separation of ind...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/78B01D69/12B01D67/00
Inventor 杨丽魏昕万国晖
Owner CHINA PETROLEUM & CHEM CORP
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