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Preparation method of high-throughput composite polyamide reverse osmosis membrane

A composite polyamide and reverse osmosis membrane technology, applied in semi-permeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve the problems of insufficient water flux and high pressure, and achieve reduced pressure, convenient operation and stable performance. Effect

Active Publication Date: 2015-07-15
广东奥斯博膜材料技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The technical problem to be solved by the present invention is to provide a method for preparing a high-flux composite polyamide reverse osmosis membrane in view of the disadvantages of the prior art that the water flux is not high enough and the pressure required for operation is too high. The reverse osmosis membrane made by the preparation method of the polyamide reverse osmosis membrane can effectively increase the water flux and greatly reduce the pressure required for operation

Method used

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  • Preparation method of high-throughput composite polyamide reverse osmosis membrane

Examples

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Effect test

Embodiment 1

[0030] 0.01% plasticizer Benzoflex-50 was added to the naphtha organic solution containing 0.15% TMC, and this was used to replace the naphtha organic solution containing 0.15% TMC in the comparative example. Other than that, all concentration conditions and molding processes are the same as those of the comparative example. The reverse osmosis membrane prepared by this method has a water flux of 47.4GFD and a desalination rate of 99.29% as measured by a flat panel tester.

Embodiment 2

[0032] 0.07% plasticizer Benzoflex-50 was added to the naphtha organic solution containing 0.15% TMC, and this was used to replace the naphtha organic solution containing 0.15% TMC in the comparative example. Other than that, all concentration conditions and molding processes are the same as those of the comparative example. The reverse osmosis membrane prepared by this method has a water flux of 59.4GFD and a desalination rate of 98.97% as measured by a flat panel tester.

Embodiment 3

[0034] 0.10% plasticizer Benzoflex-50 was added to the naphtha organic solution containing 0.15% TMC, and this was used to replace the naphtha organic solution containing 0.15% TMC in the comparative example. Other than that, all concentration conditions and molding processes are the same as those of the comparative example. The reverse osmosis membrane prepared by this method has a water flux of 64.5GFD and a desalination rate of 99.09% as measured by a flat panel tester.

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Abstract

The invention discloses a preparation method of a high-throughput composite polyamide reverse osmosis membrane. The preparation method of the high-throughput composite polyamide reverse osmosis membrane is characterized by comprising the following steps of: 1) preparing an mPDA (Meta Phenylene Di Amine) water solution; 2) immersing a porous base membrane which takes a piece of PET (polyester) nonwoven fabric as a liner by the mPDA water solution, and forming a water phase liquid layer on the surface of the porous base membrane, so as to prepare a wet membrane; 3) contacting the wet membrane with a naphtha organic solution containing TMC (Trimesoyl chloride), and carrying out interface polycondensation; 4) drying in a baking oven at 110 DEG C for 2 minutes; and 5) washing for 10 minutes by clean water. Compared with the prior art, the preparation method of the high-throughput composite polyamide reverse osmosis membrane, provided by the invention, has the beneficial effects of simple technology, convenience in operation, stable performances, and capabilities of increasing the water throughput and greatly lowering the pressure required by operation.

Description

technical field [0001] The invention relates to a preparation method of a high-flux composite polyamide reverse osmosis membrane. Background technique [0002] Reverse osmosis membrane achieves the purpose of desalination of seawater, desalination of brackish water and purification of domestic drinking water by intercepting NaCl and other salts in water. Since John Cadotte's revolutionary invention (US Patent No. 4,277,344) in 1979 to produce RO membranes with high salt rejection rates, the industrial spiral wound element industry based on reverse osmosis membranes has developed by leaps and bounds. [0003] With the advancement of technology, the energy consumption and operating costs of seawater desalination, industrial and civil water treatment using RO membrane method have been greatly reduced, making RO technology extremely competitive in the water treatment market. Nevertheless, the working mechanism of the RO membrane determines that its operating pressure is much hi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/12B01D71/56B01D67/00
Inventor 谢建新陈春惜郑周华陈永佳
Owner 广东奥斯博膜材料技术有限公司