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Forward osmosis membrane and preparation method thereof

A forward osmosis membrane and solution technology, applied in the field of membrane separation, can solve the problems of water flux decline, hindering the development of forward osmosis membrane separation technology, and decreasing osmotic pressure difference on both sides of the membrane.

Inactive Publication Date: 2014-08-27
OCEAN UNIV OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the successfully commercialized forward osmosis membranes are mainly produced by the American HTI company, which have high salt rejection rate and water flux, but there are still relatively serious internal concentration polarization phenomena, resulting in osmotic pressure on both sides of the membrane. The difference drops sharply, causing the water flux to drop
Internal concentration polarization has become an obstacle to the development of forward osmosis membrane separation technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1) Prepare the water phase solution respectively, the solvent is deionized water, the solute is m-phenylenediamine and triethylamine, and the concentration is 20g / L; the oil phase solution, the solvent is n-hexane, and the solvent is trimesoyl chloride, and the concentration is 1g / L.

[0021] 2) Soak the 300-mesh polyester screen in absolute ethanol for 30 minutes, wash it with deionized water, and dry it at 30°C.

[0022] 3) Add an appropriate amount of water phase solution into the beaker, place the screen on the upper surface of the water phase, slowly add the oil phase, and let it stand for 30 minutes to react. After the reaction is completed, the product is taken out and immersed in deionized water for later use.

[0023] The test result of the forward osmosis membrane is that the water flux is about 10L / m 2 h, the salt interception rate is about 99.1%.

[0024] The stability performance analysis of the test membrane is as follows: respectively immerse the membr...

Embodiment 2

[0026] 1) Prepare the water phase solution respectively, the solvent is deionized water, the solute is m-phenylenediamine, triethylamine and polyethyleneimine, and the concentration is 20g / L, 20g / L and 1g / L respectively; the oil phase solution, solvent It is n-hexane, the solvent is trimesoyl chloride, and the concentration is 1g / L.

[0027] 2) Soak the 300-mesh polyester screen in absolute ethanol for 30 minutes, wash it with deionized water, and dry it at 30°C.

[0028] 3) Add an appropriate amount of water phase solution into the beaker, place the screen on the upper surface of the water phase, slowly add the oil phase, and let it stand for 30 minutes to react. After the reaction is completed, the product is taken out and immersed in deionized water for later use.

[0029] The test results of the forward osmosis membrane show that the water flux is about 13L / m2h, and the salt interception rate is about 99.7%.

[0030] The results of the membrane stability test showed that...

Embodiment 3

[0032] 1) Prepare the water phase solution respectively, the solvent is deionized water, the solute is m-phenylenediamine, triethylamine and polyethyleneimine, and the concentration is 20g / L, 20g / L and 5g / L respectively; the oil phase solution, solvent It is n-hexane, the solvent is trimesoyl chloride, and the concentration is 1g / L.

[0033] 2) Soak the 300-mesh polyester screen in absolute ethanol for 30 minutes, wash it with deionized water, and dry it at 30°C.

[0034] 3) Add an appropriate amount of water phase solution into the beaker, place the screen on the upper surface of the water phase, slowly add the oil phase, and let it stand for 30 minutes to react. After the reaction is completed, the product is taken out and immersed in deionized water for later use.

[0035] The test result of the forward osmosis membrane is that the water flux is about 15L / m 2 h, the salt cut rate is about 99.5%. It can be seen that the water flux can be improved with the addition of poly...

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Abstract

The invention provides a forward osmosis membrane and a preparation method of the forward osmosis membrane. The thin-layer composite forward osmosis membrane with a screen as a supporting layer and the preparation method of the forward osmosis membrane aim to effectively reduce forward osmosis and internal concentration polarization, thereby overcoming the defects in the prior art. According to the forward osmosis membrane, the supporting layer is the screen, and a skin layer is a polyamide layer compounded on the screen. By the adoption of the good supporting layer structure of the screen, the concept of the brand-new thin-layer composite forward osmosis membrane is put forward, and a new path of the forward osmosis membrane with high performance at home and abroad is opened up. In addition, the interfacial polymerization operation is conducted on the surface of the screen, the thin-layer forward osmosis membrane with the obviously improved performance is obtained; meanwhile, new ideas are provided for preparation of other new materials.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and in particular relates to a forward osmosis membrane and a preparation method thereof. Background technique [0002] Forward osmosis technology (FO) is a new type of membrane separation technology that uses the osmotic pressure difference on both sides of the selectively permeable membrane as the driving force. Forward osmosis membrane technology has broad application prospects. Compared with traditional reverse osmosis, it has the following advantages: forward osmosis is a spontaneous separation process, so no additional pressure is required, which reduces energy consumption; at the same time, it is not a pressure-driven process. It can effectively reduce membrane fouling; the recovery rate of water in the separation process is higher than that of the reverse osmosis process, and there is no concentrated water discharge, which is a new type of environmentally friendly water treatm...

Claims

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Application Information

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IPC IPC(8): B01D71/56B01D69/10B01D69/12B01D67/00
Inventor 徐佳李明明冯晨晨李盼盼高从堦
Owner OCEAN UNIV OF CHINA