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Silicate ester modified polyamide reverse osmosis composite membrane and preparation method thereof

A reverse osmosis composite membrane, silicate technology, applied in semi-permeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve problems such as water flux reduction, and achieve the effect of performance improvement

Inactive Publication Date: 2017-07-14
OCEAN UNIV OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, co-solvent formed membranes will cause the polyamide membrane to be compacted during high pressure operation, thus causing the water flux of the membrane to decrease with the operation time during reverse osmosis operation.

Method used

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  • Silicate ester modified polyamide reverse osmosis composite membrane and preparation method thereof
  • Silicate ester modified polyamide reverse osmosis composite membrane and preparation method thereof
  • Silicate ester modified polyamide reverse osmosis composite membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Tetraethyl orthosilicate was added to the organic phase to assist interfacial polymerization for 5 minutes to prepare a polyamide reverse osmosis composite membrane.

[0037] (1) Fix the polysulfone support layer on the clip with the facing up, first pour the aqueous phase solution containing m-phenylenediamine (2wt% m-phenylenediamine) on the surface of the membrane, it is advisable to immerse the membrane surface, and use a rubber stick on the surface of the membrane. After the membrane surface was rolled back and forth for 2 minutes, the excess aqueous phase solution on the surface of the support layer was removed.

[0038] (2) After draining, submerge an appropriate amount of organic phase containing trimesoyl chloride and tetraethyl orthosilicate (0.1wt% trimesoyl chloride, 0 ~ 35wt% TEOS) on the surface of the membrane and contact the water phase for 5 minutes, The interfacial polymerization reaction is carried out under the auxiliary condition of tetraethyl ester...

Embodiment 2

[0042] Adjust the pH to 10.0, add tetramethyl orthosilicate to the organic phase to assist interfacial polymerization for 1 min, and prepare a polyamide reverse osmosis composite membrane.

[0043] (1) Fix the polysulfone support layer on the clip with the facing up, first pour the aqueous phase solution containing m-phenylenediamine (2wt% m-phenylenediamine, pH=10.0) on the membrane surface, preferably to immerse the membrane surface, Use a rubber rod to roll back and forth on the membrane surface for 2 minutes to remove excess aqueous solution on the surface of the support layer.

[0044] (2) After draining, an appropriate amount of organic phase (0.1wt% trimesoyl chloride, 0~0.3wt% TMOS) containing trimesoyl chloride and tetramethyl orthosilicate was immersed in the membrane surface and contacted with the water phase for 1 min. The interfacial polymerization reaction is carried out under the auxiliary condition of tetramethyl ester to obtain the polyamide active layer, and ...

Embodiment 3

[0048] Adjust the pH to 10.0, add tetramethyl orthosilicate to the organic phase to assist interfacial polymerization for 2 minutes, and prepare a polyamide reverse osmosis composite membrane.

[0049] (1) Fix the polysulfone support layer on the clip with the facing up, first pour the aqueous phase solution containing m-phenylenediamine (2wt% m-phenylenediamine, pH=10.0) on the membrane surface, preferably to immerse the membrane surface, Use a rubber rod to roll back and forth on the membrane surface for 2 minutes to remove excess aqueous solution on the surface of the support layer.

[0050] (2) After draining, an appropriate amount of organic phase (0.1wt% trimesoyl chloride, 0~1.6wt% TMOS) containing trimesoyl chloride and tetramethyl orthosilicate was immersed in the membrane surface and contacted with the water phase for 2 minutes. The interfacial polymerization reaction is carried out under the auxiliary condition of tetramethyl ester to obtain the polyamide active lay...

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Abstract

The invention provides a method for modifying a polyamide reverse osmosis composite membrane by the use of silicate ester. The preparation method comprises the following steps: firstly pouring an aqueous phase solution containing an aromatic polyamine compound onto the surface of a polysulfone ultrafilter membrane support layer; draining and then immersing the membrane surface with an organic liquid phase containing a proper amount of aromatic acyl chloride to contact with a water phase, wherein the organic phase or the water phase contains a proper amount of silicate ester; carrying out interfacial polymerization with the assistance of silicate ester so as to obtain a polyamide active layer; and carrying out heat treatment so as to obtain a modified polyamide reverse osmosis composite membrane. On one hand, the silicate ester is used as a cosolvent during the interfacial polymerization process so as to adjust the membrane structure; on the other hand, the silicate ester is used as a silicon source and undergoes hydrolytic polymerization during the interfacial polymerization and post-processing to generate silica nanoparticles which are doped in a polyamide separating layer. The silicate ester-assisted interfacial polymerization method combines advantages of cosolvent and inorganic nanoparticles. Through silicate ester-assisted interfacial polymerization, the reverse osmosis composite membrane with high water flux and high salt rejection is prepared.

Description

technical field [0001] The invention relates to the field of reverse osmosis composite membranes, in particular to a preparation method of silicate modified polyamide reverse osmosis composite membranes. Background technique [0002] With the rapid development of the global economy, the shortage of water resources worldwide has become increasingly prominent. Data show that by 2025, nearly 50 regions and countries will experience extreme water shortages, involving a population of 1.4 billion, mainly concentrated in underdeveloped areas. By 2035, this scale will continue to expand, and it is estimated that nearly 3 billion people will not be able to guarantee normal domestic water. Desalination of seawater or brackish water is one of the important ways to solve the serious shortage of water resources. In recent years, developed countries in the world have invariably turned their research direction to membrane desalination. As one of the earliest membrane technologies to ach...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/82B01D71/56B01D71/70B01D69/12B01D67/00
CPCB01D71/82B01D67/0006B01D69/125B01D71/56B01D71/70
Inventor 朱桂茹魏玉林高从堦
Owner OCEAN UNIV OF CHINA
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