Forward osmosis membrane having high flux for removing salt from sea water and manufacturing method threrof

一种正渗透膜、脱盐的技术，应用在用于海水脱盐的正渗透膜及其制备领域，能够解决减少寿命、分离功能损失等问题，达到防止反向扩散、提高渗水性和水通量、保证耐污染性和化学品耐受性的效果

Active Publication Date: 2012-09-12
TORAY ADVANCED MATERIALS KOREA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the characteristics of hydrophobic membranes, such membranes tend to adsorb contaminants, which can lead to loss of separation function, thereby reducing lifetime

Method used

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  • Forward osmosis membrane having high flux for removing salt from sea water and manufacturing method threrof
  • Forward osmosis membrane having high flux for removing salt from sea water and manufacturing method threrof
  • Forward osmosis membrane having high flux for removing salt from sea water and manufacturing method threrof

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preparation example Construction

[0121] The invention provides a method for preparing the forward osmosis membrane used for seawater desalination according to the invention.

[0122] More specifically, a method for preparing a forward osmosis membrane for desalination of seawater is provided, the membrane has a three-layer structure of a nonwoven fabric layer, a hydrophilic polymer layer and a polyamide layer, the method comprising: ( a) forming a hydrophilic polymer layer by coating a solution containing 10 to 25% by weight of a hydrophilic polymer on a nonwoven fabric layer; and (b) forming an organic solution containing a polyfunctional acid halide compound with An aqueous solution containing a polyfunctional amine or an alkylated aliphatic amine is contacted on the hydrophilic polymer layer to perform interfacial polymerization to form the polyamide layer.

[0123]Also provided is a method for preparing a forward osmosis membrane used for seawater desalination, the membrane has a two-layer structure of a ...

Embodiment 1

[0149] A solution containing 17.5 wt% of polyacrylonitrile as a hydrophilic polymer in an organic solvent was cast on a glass plate at a thickness of 50 μm, and then phase-transferred in water used as a non-solvent at room temperature to form a hydrophilic permanent polymer layer. The hydrophilic polymer layer thus obtained was kept in ultrapure water for about one day to extract the solvent. On the surface of the solvent-extracted membrane, an aqueous solution containing 2 wt % m-phenylenediamine (MPD) was interfaced with an organic solution containing 0.1 wt % trimesoyl chloride (TMC) in ISOPAR solvent (Exxon Corp.) In contact, the polyamide layer is formed through the polymerization reaction between these compounds to complete the composite membrane.

Embodiment 2、3 and 4

[0151] These procedures were carried out in the same manner as described in Example 1, except for the membrane composition as given in Table 1, to prepare composite membranes.

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Abstract

The forward osmosis membrane of high flux for desalinating seawater and a method for manufacturing the same are provided to minimize the reverse diffusivity of salt by applying hydrophilicity to a polysulfone-based hydrophobic membrane. CONSTITUTION: The forward osmosis membrane of high flux for desalinating seawater is the structure of a composite membrane. The composite membrane is composed of a non-woven fabric layer, a hydrophilic polymer support layer, and a polyamide layer. The hydrophilic polymer support layer includes 0.1 to 10 weight% of sulfonated polysulfone-based polymer represented by chemical formula 1. In chemical formula 1, A is selected from chemical formula 2; B is selected from chemical formula 3; m divides the sum of n and m is between 0.2 and 0.7; and x is between 50 and 2,300. A method for manufacturing the forward osmosis membrane includes the following: a hydrophilic polymer containing solution is doped on the non-woven fabric layer to form the hydrophilic polymer support layer; the polyamide layer is formed on the surface of the hydrophilic polymer support layer by contacting a polyfunctional acid halide compound containing organic solution with an aqueous solution containing polyfunctional amine or alkylated aliphatic amine.

Description

technical field [0001] The present invention relates to a forward osmosis membrane for seawater desalination and a preparation method thereof, more particularly, to such a forward osmosis membrane for seawater desalination and a preparation method thereof, which can promote The water flows into the draw solution (draw solution) to achieve high water permeability and excellent pollution resistance, especially to meet the properties of preventing the reverse diffusion of dissolved substances in the draw solution in the direction of reverse osmosis, so it is suitable for high-concentration seawater desalination. Background technique [0002] Forward osmosis is a membrane separation technique that utilizes the osmotic pressure caused by the concentration difference between two solutions as the driving force for transporting water from a lower concentration solution to a higher concentration solution through a membrane. Since forward osmosis is just the opposite of reverse osmos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/56B01D71/42B01D69/12
CPCB01D61/00B01D67/0006B01D69/10B01D69/125B01D71/16B01D71/38B01D71/40B01D71/42B01D71/44B01D71/52B01D71/56B01D71/60B01D2323/30B01D2325/022B01D2325/026B01D2325/36B01D69/12B01D71/421B01D2325/0231B01D69/1071B01D69/1213B01D69/1216B01D69/1251B01D71/4011B01D71/383B01D71/381B01D71/441B01D71/5211
Inventor 池成大车俸峻李钟和金都丽林秀净
Owner TORAY ADVANCED MATERIALS KOREA
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