Method for manufacturing anti-chloride polyamide reverse osmosis composite membrane with high flux

A reverse osmosis composite membrane, chloropolyamide technology, applied in reverse osmosis, semi-permeable membrane separation, chemical instruments and methods, etc. The effect of improving adhesion, improving chlorine resistance, and improving chemical resistance

Inactive Publication Date: 2011-09-14
NANJING DELNAMEM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In terms of water flux improvement, in addition to the wide application of various additives, U.S. Patent US20100062156 disperses nanoparticles into polyamine or polyacyl chloride solutions, and the water flux of the resulting composite membrane can be doubled, but the potential risk is that the interface is attached. The strength becomes weaker, which reduces the chlorine resistance and oxidation resistance of the membrane and the service life of the membrane

Method used

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  • Method for manufacturing anti-chloride polyamide reverse osmosis composite membrane with high flux

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1, configuration concentration is 30% Antegu F-05 epoxy glue organic solution (solvent chooses dioxane), and this epoxy glue organic solution is added in the polysulfone-dimethyl sulfoxide solution And mix evenly, wherein, the concentration percentage of epoxy glue organic solution, polysulfone, dimethyl sulfoxide is 10%, 16%, 74% respectively, then use the same base film manufacturing process and composite process as in the comparative example to compound film forming. The test conditions are the same as those of the comparative example, and the results are listed in Table 1. After soaking in 1000ppm NaClO aqueous solution for 10 hours, the retention rate of NaCl is still as high as 98.0%.

Embodiment 2

[0023] Embodiment 2, configuration concentration is 30% Antegu F-05 epoxy glue organic solution (solvent chooses dioxane), and this epoxy glue organic solution is added in the polysulfone-dimethyl sulfoxide solution And mix evenly, wherein, the concentration percentage of epoxy glue organic solution, polysulfone, dimethyl sulfoxide is 3%, 16%, 81% respectively, then use the same base film manufacturing process and composite process as in the comparative example to compound film forming. The test conditions are the same as those of the comparative example, and the results are listed in Table 1. After soaking in 1000ppm NaClO aqueous solution for 10 hours, the retention rate of NaCl is still as high as 95.1%.

Embodiment 3

[0024] Embodiment 3, configuration concentration is 30% Antegu F-05 epoxy glue organic solution (solvent chooses dioxane), and this epoxy glue organic solution is added in the polysulfone-dimethyl sulfoxide solution And mix evenly, wherein, the concentration percentages of epoxy glue organic solution, polysulfone, and dimethyl sulfoxide are 3%, 16%, and 81% respectively, and then evenly disperse nano-zeolite particles into the casting liquid, add nano-zeolite The mass of the particles is 1% of the mass of the bottom film casting liquid, and the same bottom film manufacturing process and composite process as in the comparative example are used to compound the film. The test conditions are the same as those of the comparative example, and the results are listed in Table 1. The water flux and chlorine resistance are both improved.

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Abstract

The invention relates to a method for manufacturing an anti-chloride polyamide reverse osmosis composite membrane with high flux, comprising the following steps of: adding one or two of a compound containing epoxy group and a compound containing isocyanide acid group in a basement membrane casting liquid; manufacturing a support basement membrane with a universal phase inversion method; and then compounding a layer of polyamide reverse osmosis composite membrane on the surface of the obtained support basement membrane with an interface polymerization method. The anti-chloride performance and water flux of the obtained composite membrane are increased. In order to further increase the water flux of the polyamide reverse osmosis composite membrane, nano-particles are further added in the basement membrane casting liquid, and the nano-particles are dispersed in the basement membrane casting liquid. The nano-particles can greatly enhance the roughness of the basement membrane surface and increase the valid surface area of the membrane, thereby being capable of increasing the water flux of the composite membrane.

Description

technical field [0001] The invention relates to a method for manufacturing a high-throughput chlorine-resistant polyamide reverse osmosis composite membrane, and belongs to the technical field of semipermeable membrane preparation methods. Background technique [0002] Nanofiltration and reverse osmosis membranes have become one of the key technologies for water treatment due to their excellent separation performance for small organic molecules and inorganic salt ions, as well as safety, environmental friendliness, and easy operation. Its applications include seawater and brackish desalination, hard water softening, reclaimed water recovery, industrial wastewater treatment, ultra-pure water preparation, etc. Among them, the composite membrane has become the fastest-growing and most widely used membrane variety because of its ability to optimize the membrane’s rejection rate, water flux, and stability. Currently, more than 90% of the nanofiltration and reverse osmosis membran...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/56B01D69/12B01D61/02C02F1/44
Inventor 武少禹
Owner NANJING DELNAMEM TECH CO LTD
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