Reverse osmosis membrane

A technology of reverse osmosis membrane and polysulfone layer, applied in reverse osmosis, semi-permeable membrane separation, membrane and other directions, can solve the problems of low initial osmosis flux efficiency, deterioration of water purification function, pollution of reverse osmosis membrane, etc. The effect of permeate flux, excellent salt rejection

Active Publication Date: 2015-11-25
LG CHEM LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the polyamide-based reverse osmosis membrane prepared by the above conventional methods may have the disadvantage of low initial permeate flux efficiency, resulting in deterioration of water purification function.
Also, in the case of water treatment using reverse osmosis membranes, solutes or ionic compounds may be adsorbed to the surface of the reverse osmosis membrane to contaminate the reverse osmosis membrane, causing water permeation characteristics such as permeate flux and salt rejection to decrease over time

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] The solubility parameter value is 24.9 (J / cm 3 ) 1 / 2 ) of N,N-dimethylformamide (DMF) and solubility parameter value of 26.7 (J / cm 3 ) 1 / 2 ) and dimethyl sulfoxide (DMSO) in a ratio of 90:10 to prepare a mixed solvent, and add 18wt% polysulfone to it, and stir at 80°C for 12 hours or longer to prepare a uniformly mixed liquid phase solution. The resulting solution was cast on a nonwoven polyester fabric having a thickness of 100 μm to obtain a fabric having a thickness of 150 μm, and the resulting fabric was immersed in water to prepare a porous polysulfone support.

[0057] After immersing the prepared porous polysulfone support in an aqueous solution containing 2wt% m-phenylenediamine (mPD) for 2 minutes and taking it out, the excess aqueous solution on the support was removed using a 25 psi roller, and the Dry at room temperature for 1 min.

[0058] Then, the above-mentioned support body was immersed in the ISOL-C solution (SKC company) containing 0.1wt% tribenzo...

Embodiment 2

[0060] A reverse osmosis membrane was prepared in the same manner as in Example 1 except that DMF and DMSO were mixed in a ratio of 80:20.

[0061] Here, images of the polysulfone layer surface analyzed by scanning electron microscopy (SEM) are shown in figure 1 middle.

Embodiment 3

[0063] A reverse osmosis membrane was prepared in the same manner as in Example 1 except that DMF and DMSO were mixed in a ratio of 70:30.

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Abstract

There is provided a reverse osmosis membrane including a porous support; a polysulfone layer formed on the porous support and having pores formed in a surface thereof, pores having a diameter of 40 nm or greater accounting for less than 0.5% of total pores; and an active layer.

Description

technical field [0001] The present disclosure relates to a reverse osmosis membrane, and more particularly, to a reverse osmosis membrane comprising a polysulfone layer having pores formed in a surface thereof having a predetermined range of distribution, Average diameter and pore area ratio, etc. Background technique [0002] Osmosis is a phenomenon in which a solvent moves from a solution with a low solute concentration to another solution with a high solute concentration across a semipermeable separation membrane that separates the two solutions. In this case, the pressure acting on the solution with high solute concentration by the movement of the solvent is called osmotic pressure. However, when an external pressure higher than the osmotic pressure level is applied, the solvent moves towards a solution with a low solute concentration, a phenomenon known as reverse osmosis. According to the principle of reverse osmosis, various types of salts or organic substances can ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/10B01D61/02B01D71/68B01D69/12
CPCB01D71/68B01D61/025B01D69/02B01D69/10B01D69/12B01D69/125B01D71/56B01D2325/02B01D61/02
Inventor 权慧珍李升烨郑胜杓李弼申程圭
Owner LG CHEM LTD
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