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Asymmetric membrane with pore size, preparation method, and application in seawater desalination

An asymmetric and diaphragm technology, applied in seawater treatment, chemical instruments and methods, membranes, etc., can solve the problem of no polyolefin diaphragm

Active Publication Date: 2022-03-25
JIANGSU HORIZON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Current technical status: In terms of materials, polysulfone has gradually replaced the early cellulose materials due to its stable chemical structure, high heat resistance, good mechanical strength and easy processing, and has become the main body of research in recent years. Porous polysulfone porous skin can be used to prepare composite membranes with high water flux. At present, there is no polyolefin membrane as a seawater desalination filter membrane.

Method used

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  • Asymmetric membrane with pore size, preparation method, and application in seawater desalination
  • Asymmetric membrane with pore size, preparation method, and application in seawater desalination

Examples

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Embodiment 1

[0021] The asymmetric pore diameter diaphragm of the present embodiment 1 includes: a diaphragm distributed with multi-layer microporous structures; wherein the microporous structures on the upper and lower surface layers of the diaphragm have unequal pore diameters.

[0022] Optionally, the pore diameters of the microporous structures of the upper surface layer 1, the middle layer 2, and the lower surface layer 3 of the membrane are 100-200 nm, 70-100 nm, and 10-40 nm in sequence. Optionally, the pore diameters of the microporous structures of the upper surface layer, the middle layer, and the lower surface layer of the membrane are 140 nm, 80 nm, and 25 nm in sequence.

[0023] Optionally, the thickness ratio of the upper surface layer, the middle layer, and the lower surface layer of the diaphragm is 1 / 4:1 / 2:1 / 4 in turn, and the macroporous structure of the upper surface layer of the diaphragm blocks macromolecular impurities and bacteria in seawater , the micropores in the...

Embodiment 2

[0026] See figure 1 , on the basis of Example 1, this Example 2 also provides a method for preparing a diaphragm with an asymmetric pore size, including: blending and extruding, that is, melting and extruding the raw materials to obtain a melt; casting sheet cooling, that is, passing the melt through Cast sheet to obtain gel sheet; asynchronous biaxial stretching, that is, stretching the gel sheet to obtain a stretched film; extraction, that is, the stretched film is washed with an extractant to remove paraffin oil, and a microporous diaphragm is obtained; heat setting, that is, to control the microporous diaphragm The processing temperature of the upper and lower surfaces is different, so that the pore diameters of the microporous structures on the upper and lower surfaces of the microporous diaphragm are different; and winding and cutting to obtain a multilayer microporous diaphragm with asymmetric pore diameters on both sides (ie, asymmetric pore diameter diaphragm) .

[0...

Embodiment 3

[0039] On the basis of embodiment 1 or 2, this embodiment 3 also provides an application of a membrane with asymmetric pore size as a reverse osmosis membrane for seawater desalination.

[0040] Specifically, the upper surface of the diaphragm is distributed with a dense microporous structure of small pore size, and the lower surface of the diaphragm is distributed with a microporous structure of large pore size. When seawater passes through the diaphragm, the microporous structure of the upper surface layer of the diaphragm is suitable for water molecules and dissolved oxygen to pass through smoothly. However, it will cut off impurities, bacteria and macromolecular salts (diameter > 10nm) in seawater, and obtain drinkable fresh water on the lower surface of the diaphragm to achieve seawater desalination.

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Abstract

The invention belongs to the technical field of lithium battery diaphragms, and in particular relates to a diaphragm with an asymmetric pore size, a preparation method, and an application in seawater desalination. The diaphragm with asymmetric pore size includes: a diaphragm with multi-layer microporous structure; the microporous structure on the upper and lower surface layers of the diaphragm has unequal pore diameter. When seawater passes through the diaphragm, the microporous structure of the upper surface layer of the diaphragm is suitable for water molecules and dissolved oxygen to pass through smoothly, but it will block impurities, bacteria and macromolecular salts in seawater, and obtain drinkable fresh water on the lower surface layer of the diaphragm. Seawater desalination is realized, that is, the membrane with asymmetric pore size can be used as a seawater desalination reverse osmosis membrane and applied to seawater desalination.

Description

technical field [0001] The invention belongs to the technical field of lithium battery diaphragms, and in particular relates to a diaphragm with an asymmetric pore size, a preparation method, and an application in seawater desalination. Background technique [0002] my country's fresh water resources are increasingly scarce, and the per capita water resources only account for a quarter of the world's level. However, my country's seawater resources are very rich, so the prospect of seawater desalination technology is broad. [0003] Current technical status: In terms of materials, polysulfone has gradually replaced the early cellulose materials due to its stable chemical structure, high heat resistance, good mechanical strength and easy processing, and has become the main body of research in recent years. Porous polysulfone porous skins can be used to prepare composite membranes with high water flux. At present, there is no polyolefin membrane as a seawater desalination filt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D61/02B01D69/02B01D67/00B01D71/26C02F1/44C02F103/08
CPCB01D61/025B01D69/02B01D67/002B01D67/0083B01D67/0086B01D71/26C02F1/441B01D2325/022C02F2103/08B01D2323/50Y02A20/131
Inventor 蒋涛翁星星贾培梁王正丽孙爱斌
Owner JIANGSU HORIZON NEW ENERGY TECH CO LTD
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