Composite separating membrane and preparation method and application thereof

A separation membrane and separation layer technology, applied in separation methods, semi-permeable membrane separation, dispersed particle separation, etc., can solve the problems of affecting the service life of the membrane, insufficient physical and chemical stability, and degradation of membrane performance, so as to achieve easy control, Effect of improving resistance and simple preparation method

Active Publication Date: 2014-06-25
DALIAN EUROFILM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the lack of physical and chemical stability of the transition layer of polymer materials in practical appli

Method used

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  • Composite separating membrane and preparation method and application thereof
  • Composite separating membrane and preparation method and application thereof
  • Composite separating membrane and preparation method and application thereof

Examples

Experimental program
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Embodiment 1

[0070] This embodiment discloses a composite separation membrane and its manufacturing method, such as figure 1 As shown, it includes a bottom film 1, a transition layer 2 composed of MOF particles, and a separation layer 3. The composite membrane of this embodiment is prepared by the following steps:

[0071] (1) Clean the surface of the polyacrylonitrile base film and dry it;

[0072] (2) Add ZIF-7 to pure water 5 times and ultrasonicate for 60 minutes at the same time to prepare a suspension with a concentration of 1wt.% for later use.

[0073] (3) Coat the ZIF-7 suspension of step (2) on the base film of step (1), dry in the shade at room temperature for 60 minutes, and then take it out after further drying at 80°C for 2 hours;

[0074] (4) After soaking the membrane in step (3) in 2wt.% PEBA solution for 1min, take the membrane out of the solution and dry it in the shade at room temperature for 20min;

[0075] (5) Put the film obtained in step (4) into a blast oven for...

Embodiment 2

[0078] This embodiment discloses a composite separation membrane and its manufacturing method. The composite separation membrane in this embodiment is prepared by the following steps:

[0079] (1) Clean the surface of the polyacrylonitrile base film and dry it;

[0080] (2) Add ZIF-7 to pure water 5 times and ultrasonicate for 60 minutes at the same time to prepare a suspension with a concentration of 1.5wt.% for later use.

[0081] (3) Coat the ZIF-7 suspension of step (2) on the base film of step (1), dry in the shade at room temperature for 60 minutes, and then take it out after further drying at 80°C for 2 hours;

[0082] (4) After soaking the membrane in step (3) in 2wt.% PEBA solution for 1min, take the membrane out of the solution and dry it in the shade at room temperature for 20min;

[0083] (5) Put the film obtained in step (4) into a blast oven for further drying under heating conditions, the drying temperature is 80°C, take it out after heating in the oven for 30 ...

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Abstract

The invention provides a composite separating membrane and a preparation method and application thereof. The composite separating membrane comprises a bottom membrane, and is characterized in that the bottom membrane is attached to a transition layer; the transition layer consists of metal organic frame materials. The invention also discloses a method for preparing the composite membrane. The method comprises the following steps: sequentially and ultrasonically dispersing the metal organic frame materials to form suspension; and coating the suspension made of the metal organic frame materials and a solution of separating layer materials on the bottom membrane to sequentially form the transition layer and a separating layer. The separating membrane is simple in preparation method and is easy to control and can be used for the preparation process of various composite membranes in the separating membrane industry. Compared with a conventional high polymer material transition layer, the composite separating membrane has high physical and chemical stability and mechanical performance and has wide application prospects.

Description

technical field [0001] The invention relates to membrane technology, in particular to a composite separation membrane, its preparation method and application. Background technique [0002] Purification and separation of raw materials or products is a problem that often needs to be faced in the chemical industry. Membrane separation technology has gradually been widely used due to its advantages of high energy efficiency and easy scale-up. play an increasingly important role. Membrane material and membrane preparation technology are the two main factors that determine the membrane separation performance. Only an asymmetric structure membrane can meet the needs of industrial production. Therefore, in many cases, the membrane must be made into a composite membrane with an ultra-thin skin layer. [0003] On the other hand, the base membrane required for the production of composite membranes is often prepared by the phase inversion method, and the obtained membrane surface often...

Claims

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Application Information

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IPC IPC(8): B01D71/42B01D69/12B01D67/00B01D61/02B01D53/22
Inventor 季鹏飞王忠强曲韵翔王连军李恕广耿平杜国栋栗广勇
Owner DALIAN EUROFILM IND
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