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Composite semipermeable membrane

A composite semi-permeable membrane and support membrane technology, applied in the direction of semi-permeable membrane separation, membrane, membrane technology, etc., can solve the problem of water permeability reduction and achieve the effect of energy saving

Active Publication Date: 2014-06-04
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this method, since the surface of the separation functional layer is coated, there is a problem that the water permeability is lowered.

Method used

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  • Composite semipermeable membrane
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0109] Examples are given below to describe the present invention, but the present invention is not limited by these Examples.

[0110] (NaCl removal rate)

[0111] Evaluation water adjusted to a temperature of 25° C., pH 7, and a sodium chloride concentration of 2000 ppm was supplied to the composite semipermeable membrane at an operating pressure of 1.55 MPa to perform membrane filtration treatment. The electrical conductivity of the feed water and the permeated water were measured with a conductivity meter manufactured by Toa Denpa Kogyo Co., Ltd. to obtain the respective actual salinity, that is, the NaCl concentration. Based on the NaCl concentration thus obtained and the following formula, the NaCl removal rate was calculated.

[0112] NaCl removal rate (%)=100×{1-(NaCl concentration in permeate water / NaCl concentration in supply water)}

[0113] (membrane flux)

[0114] In the previous test, the membrane permeation volume of the supplied water (NaCl aqueous solution)...

Embodiment 1

[0138] The composite semipermeable membrane obtained in Comparative Example 1 was treated at 30° C. for 1 minute with a 0.30 wt % sodium nitrite aqueous solution adjusted to pH 3 with sulfuric acid. After the composite semipermeable membrane was taken out from the nitrous acid aqueous solution, it was washed with 20° C. pure water to obtain a composite semipermeable membrane. The composite semipermeable membrane thus obtained was evaluated, and the membrane properties were the values ​​shown in Table 1.

Embodiment 2～4

[0140] A composite semipermeable membrane was prepared in the same manner as in Example 1 except that the thickness of the porous support layer was changed as shown in Table 1. The membrane properties of the obtained composite semipermeable membranes are shown in Table 1.

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Abstract

A composite semipermeable membrane provided with the following: a porous support membrane comprising a substrate and a porous support layer; and a polyamide separating functional layer provided on said porous support layer. The zeta potential of said separating functional layer at a pH of 6 is -20 mV or lower, and the difference between the zeta potential of the separating functional layer at a pH of 10 and the zeta potential of the separating functional layer at a pH of 3 is at most 25 mV. Provided is a method for manufacturing a composite semipermeable membrane that exhibits high water permeability, high salt-removal performance, and high acid / alkali resistance.

Description

technical field [0001] The present invention relates to a composite semipermeable membrane with high water permeability and high salt removal performance, and high acid / alkali resistance. The composite semipermeable membrane obtained by the present invention can be suitable for desalination of seawater and salt water, for example. Background technique [0002] Regarding the separation of mixtures, there are various techniques for removing substances (such as salts) dissolved in solvents (such as water), and in recent years, the application of membrane separation methods is expanding as a step to save energy and resources. As the membrane used in the membrane separation method, there are microfiltration membranes, ultrafiltration membranes, nanofiltration membranes, reverse osmosis membranes, and the like. These membranes are used in the case of obtaining drinking water from, for example, seawater, brackish water, water containing harmful substances, etc., or in the producti...

Claims

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Application Information

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IPC IPC(8): B01D71/56B01D69/10B01D69/12C08G69/02
CPCB01D2325/14B01D2325/06C09D177/06B01D67/0006B01D69/12B01D67/0088B01D2325/30B01D2323/40B01D2325/16B01D69/125B01D67/0083B01D69/10B01D71/56B01D69/1071B01D69/1216B01D69/1213C08G69/02B01D2325/26B01D2325/04
Inventor 高谷清彦中辻宏治木村将弘佐佐木崇夫志村晴季
Owner TORAY IND INC
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