Composite semipermeable membrane, process for production of the same, and use thereof

一种复合半透膜、支持膜的技术，应用在半透膜分离、化学仪器和方法、膜技术等方向，能够解决硼阻止率提高等问题

Inactive Publication Date: 2008-12-17
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, even with this method, it is difficult to increase the boron blocking rate to a sufficient level

Method used

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  • Composite semipermeable membrane, process for production of the same, and use thereof
  • Composite semipermeable membrane, process for production of the same, and use thereof
  • Composite semipermeable membrane, process for production of the same, and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0080] The characteristics of the composite semipermeable membranes of Examples and Comparative Examples were obtained as follows: Under an operating pressure of 5.5 MPa, the composite semipermeable membrane was supplied with seawater adjusted to a temperature of 25° C. and a pH of 6.5 (TDS concentration about 3.5%, boron concentration About 5.0ppm), perform membrane filtration treatment, measure the water quality of the permeated water obtained and the water quality of the supplied water, and obtain it from this. The measured values ​​or calculation formulas are as follows.

[0081] (TDS removal rate)

[0082] The TDS concentration in the permeate water and the TDS concentration in the feed water were measured, and the TDS removal rate (%) was calculated according to the following formula.

[0083] TDS removal rate (%)=100×{1-(TDS concentration in permeate water / TDS concentration in feed water)}

[0084] (membrane permeation flux)

[0085] The membrane permeation water of ...

reference example 1

[0099] (Reference Example 1) Synthesis of (4-chlorocarbonylmethoxyphenoxy)acetyl chloride (compound 1)

[0100] Dissolve 5.51g (50.0mmol) of hydroquinone and 16.1g (105.0mmol) of methyl bromoacetate in 50.0ml of N,N-dimethylformamide (hereinafter referred to as DMF), and add 20.7g (150.0mmol) of potassium carbonate , stirred for 12 hours. Water was added to the reaction mixture, and after extraction with ethyl acetate, the organic layers were combined, washed with aqueous sodium bicarbonate solution, water, and saturated brine, and dried over anhydrous sodium sulfate. The desiccant was removed, the residue was concentrated under reduced pressure, and the resulting residue was recrystallized from dichloromethane / n-hexane to obtain 10.7 g of colorless crystals.

[0101] 7.80 g of this crystal was dissolved in 30.0 ml of methanol, 46.0 ml (92.0 mmol) of 2N aqueous sodium hydroxide solution was added over 20 minutes, and the mixture was stirred at room temperature for 12 hours. ...

reference example 2

[0104] Compound 2 was synthesized in the same manner as in Reference Example 1, except that hydroquinone was replaced with resorcinol.

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Abstract

The invention provides a composite semipermeable membrane which exhibits a high salt rejection ratio and high rejection even against boron non-dissociative in the neutral region. The composite semipermeable membrane is produced by using, in forming a polyamide separation function layer on a porous supporting membrane, an organic solvent solution containing a specific alicyclic or aromatic compound so as to make the polyamide constituting the separation function layer contain in the molecule a partial structure defined by the wording ''an alicyclic or aromatic group having two or more specific substituents, at least one of which contains a heteroatom linkage and bears carbonyl at the beta- or gamma-position''.

Description

technical field [0001] The invention relates to a composite semipermeable membrane for selective separation of liquid mixtures and a manufacturing method thereof. The present invention relates to a composite semipermeable membrane in which a polyamide separation functional layer is formed on a microporous support membrane, and a method for producing the same, which is suitable for removing solute components such as boron in seawater or salt water. Background technique [0002] In recent years, people have attempted to use composite semipermeable membranes for desalination of seawater, and they have gradually been put into practical use in water treatment plants (plants) around the world. Generally, the composite semipermeable membrane is a composite membrane structure in which a separation function layer is coated on a microporous supporting membrane. When the separation functional layer is formed by cross-linked aromatic polyamide, it has the advantage of being rigid due t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/56B01D69/12B01D71/82C02F1/44
CPCB01D61/025B01D69/12B01D71/56C02F1/441C02F2103/08B01D69/125Y02A20/131B01D71/82C02F1/44B01D69/1213B01D69/10B01D67/0006B01D2323/30B01D2323/36B01D2325/20C02F2101/108
Inventor 中辻宏治富冈洋树
Owner TORAY IND INC
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