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Preparation method of high-dispersion titanium dioxide doped polyamide reverse osmosis film

A technology of reverse osmosis membrane and titanium dioxide is applied in the field of membrane materials, which can solve the problems of reducing membrane performance, low qualified rate of hybrid membrane, and difficulty in concentration being too large, so as to avoid mutual influence, ensure the uniformity of dispersion, and avoid the effect of agglomeration

Active Publication Date: 2020-02-18
南京驰探科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the applicant found that the qualified rate of the hybrid film prepared by this method is low. On the one hand, the hydrolysis process of tetrabutyl titanate will seriously interfere with the interfacial polymerization process, and on the other hand, the concentration of tetrabutyl titanate added to the oil phase is not easy. Otherwise, agglomeration will also occur during the hydrolysis process, which will reduce the membrane performance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Solution preparation

[0025] Hydrolysis solution: add hydrochloric acid dropwise in the alcohol aqueous solution with ethanol volume concentration of 90% to adjust its pH to 6, and stir to form a hydrolysis solution;

[0026] Mix the organic phase monomer solution: add trimesoyl chloride as the organic phase monomer to IsoparG oil so that the concentration of the acid chloride monomer is 0.2wt%, add tetrabutyl titanate dropwise under heating and stirring at 60°C, And continue heating and stirring for 2h to form an organic phase monomer solution, wherein the concentration of tetrabutyl titanate is 5g / L;

[0027] Aqueous monomer solution: add m-phenylenediamine aqueous monomer into pure water, and keep stirring to form aqueous monomer solution, wherein the concentration of m-phenylenediamine is 2wt%;

[0028] (2) Immerse the polysulfone-based membrane in the hydrolysis solution for 40 seconds, and roll it with a rubber roller to remove the excess solution;

[0029]...

Embodiment 2

[0033] The preparation method of this example is basically the same as that of Example 1, except that the concentration of tetrabutyl titanate is 1 g / L.

[0034] Using 2000ppm sodium chloride aqueous solution to test the permeability of the membrane under the pressure of 1.5MPa, the obtained reverse osmosis membrane has a desalination rate of 95.0% for sodium chloride and a pure water flux of 60.6L / m 2 .h.

Embodiment 3

[0036] The preparation method of this example is basically the same as that of Example 1, except that the concentration of tetrabutyl titanate is 10 g / L.

[0037] Using 2000ppm sodium chloride aqueous solution to test the permeability of the membrane under the pressure of 1.5MPa, the desalination rate of the obtained reverse osmosis membrane to sodium chloride is 93.1%, and the pure water flux is 68.3L / m 2 .h.

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Abstract

According to the preparation method, tetrabutyl titanate is hydrolyzed into titanium dioxide in an organic phase, and then interfacial polymerization is performed to obtain a titanium dioxide doped polyamide reverse osmosis film, so that the dispersion uniformity of titanium dioxide particles in an organic phase is ensured, the hydrolysis process and the interfacial polymerization process are separated, and the mutual influence between the hydrolysis process and the interfacial polymerization process is avoided; an alcohol-water mixture is used as a hydrolysis solution, the pH is adjusted to be acidic, and the low hydrolysis temperature is controlled to control the slow hydrolysis process of the tetrabutyl titanate in the organic phase, so that the dispersion uniformity and dispersion concentration of the tetrabutyl titanate in the organic phase are ensured, and finally, the anti-pollution capacity and water flux of the polyamide reverse osmosis film are effectively improved.

Description

[0001] Technical field: The present invention relates to a membrane material, in particular to a titanium dioxide-doped polyamide reverse osmosis membrane and a preparation method thereof. Background technique: [0002] Reverse osmosis technology is a pressure-driven membrane separation technology. It uses the selective permeability of the reverse osmosis membrane to intercept ionic substances or small molecular substances through the solvent only, and uses the pressure difference on both sides of the membrane as the driving force to realize the reverse osmosis. Membrane process for the separation of liquid mixtures. Reverse osmosis technology is widely used in boiler feed water, pure water preparation, seawater desalination, electroplating electronics industry, food and medicine, chemical industry, environmental protection and other industries. [0003] Polyamide reverse osmosis membrane is the most common type of reverse osmosis membrane, but pure polyamide membrane has disa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/56B01D69/02B01D67/00B01D61/02
CPCB01D61/025B01D67/0079B01D69/02B01D71/56B01D2325/48Y02A20/131
Inventor 徐业华
Owner 南京驰探科技有限公司
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