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Semipermeable composite membrane and method for producing same

A composite semi-permeable membrane and manufacturing method technology, applied in semi-permeable membrane separation, chemical instruments and methods, membrane technology, etc. High salt removal rate, the effect of realizing salt removal rate

Active Publication Date: 2019-12-03
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Chemical fouling is caused by accumulation of humus, surfactants and other organic substances contained in treated water such as drainage on the surface of the separation membrane or adsorbed inside the separation membrane, resulting in clogging of the separation membrane. Phenomenon of degraded separation performance
[0006] On the other hand, biological fouling is caused by the microorganisms contained in the water to be treated using the organic matter adsorbed on the separation membrane by the aforementioned chemical fouling as a nutrient source, and multiplying on the surface and inside of the separation membrane, thereby clogging the separation membrane. A phenomenon in which the permeation rate of the treated water decreases and the separation performance decreases

Method used

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  • Semipermeable composite membrane and method for producing same
  • Semipermeable composite membrane and method for producing same
  • Semipermeable composite membrane and method for producing same

Examples

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Embodiment

[0210] Hereinafter, although an Example is given and this invention is demonstrated, this invention is not limited at all by these Examples.

[0211] [1. Measurement of properties]

[0212] (NaCl removal rate)

[0213] To the composite semipermeable membrane, evaluation water with a temperature of 25°C, a pH of 7, and a sodium chloride concentration adjusted to 2,000 ppm was supplied at an operating pressure of 1.55 MPa, and membrane filtration treatment was performed. 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 salt content, that is, the NaCl concentration. Based on the NaCl concentration thus obtained and the following formula, the NaCl removal rate was calculated.

[0214] NaCl removal rate (%)=100×{1-(NaCl concentration in permeate water / NaCl concentration in supply water)}

[0215] (through rate)

[0216] In the test of the preced...

Synthetic example 1

[0237] Adjust to form a pH 3 aqueous solution of 5% by weight of N-[3-(aminoethyl)]methacrylamide hydrochloride (AEMAm) and 5% by weight of acrylic acid (AA), and after bubbling with nitrogen, 3% by weight of sodium persulfate was added as an initiator, and a polymerization reaction was performed at 70° C. for 2 hours to obtain a polymer (PAA-co-PAEMAm) with a weight average molecular weight of 7,100.

Synthetic example 2

[0239] In addition to using 3-[[2-(methacryloyloxy)ethyl)]dimethylammonium] propionate (MOEDMAP) instead of AEMAm, according to Synthesis Example 1, a polymer with a weight average molecular weight of 12,000 was obtained substance (PAA-co-PMOEDMAP).

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Abstract

The present invention provides a semipermeable composite membrane having high fouling resistance against membrane contaminants; and a method for producing the semipermeable composite membrane. This semipermeable composite membrane comprises a substrate, a porous support layer disposed on the substrate, and a separation functional layer disposed on the porous support layer, wherein the separation functional layer contains: from the porous support layer side, a first layer containing a crosslinked aromatic polyamide which is a polymer of a polyfunctional aromatic amine and a polyfunctional aromatic acid chloride; and an aliphatic polyamide which is present on the first layer and which is a polymer of a polyfunctional aliphatic carboxylic acid and a polyfunctional aliphatic amine.

Description

technical field [0001] The invention relates to a composite semipermeable membrane with high ability to inhibit the adhesion of membrane fouling substances. The composite semipermeable membrane obtained by the present invention can be suitably used for desalination of saline-alkali water and seawater, for example. Background technique [0002] Regarding the separation of mixtures, there are various techniques for removing substances (eg salts) dissolved in solvents (eg water). In recent years, the use of membrane separation methods has expanded as a process for saving energy and saving resources. Among the membranes used in the membrane separation method, there are precision filtration 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, saline water, water containing harmful substances, etc., production of industrial ultrapure w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/56B01D69/10B01D69/12B32B5/18B32B27/34C08G81/02
CPCB01D69/10B01D69/12B01D71/56C08G81/02B01D65/08B01D69/125C08G81/024Y02A20/131B01D67/0006C02F1/44C02F2103/08C08F220/06C08F220/36C08F220/60C08G69/26C08G81/028C08J5/18C08J2333/02C08J2333/14C08J2333/26C08J2377/06B01D69/1071B01D69/1214
Inventor 吉崎友哉浜田刚志冈部淳小川贵史
Owner TORAY IND INC
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