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Composite reverse osmosis membrane based on water-soluble polymer and preparation method thereof

A technology of water-soluble polymer and reverse osmosis membrane, which is applied in the direction of reverse osmosis, semi-permeable membrane separation, and general water supply saving, etc. The improvement is not significant, etc., to achieve the effect of increasing water flux, improving pollution resistance and permeability, and ensuring water flux

Active Publication Date: 2022-02-18
江苏安普林新材料研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, water-soluble polymers such as polyvinyl alcohol and polyvinylpyrrolidine copper are usually modified on the surface of the reverse osmosis membrane to obtain hydrophilicity and stain resistance. However, this modification is harmful to water in the actual application process. The increase in flux is not significant, and the salt rejection rate and fouling resistance need to be further improved
On the other hand, the change of membrane porosity caused by the modification process also reduces the water flux.

Method used

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  • Composite reverse osmosis membrane based on water-soluble polymer and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Step 1: (1) Mix 5 parts of m-phenylenediamine, 0.1 part of sodium dodecylbenzenesulfonate, 10 parts of thionyl chloride, 6 parts of glycerin, and 210 parts of deionized water to form a mixed solution, using 0.8wt% Camphorsulfonic acid solution, 0.5wt% sodium hydroxide solution to adjust pH=7.8 to obtain an aqueous phase solution; (2) Dissolving the trimesoyl chloride solution in the Isopa-G solution to obtain an oil phase solution with a concentration of 24wt% (3) Add the coated bacteria into n-hexane and mix evenly, add 2v / v% linoleic acid, set the temperature at 30°C and react for 4 hours; centrifuge to obtain n-hexane extract. (4) Place the polysulfone support membrane in the water phase solution and immerse for 1.5 minutes to remove excess water phase solution; transfer to the oil phase solution for interfacial polymerization for 2 minutes; place it in n-hexane extract solution for activation for 2 minutes; set the temperature to 80 ℃ drying for 5 minutes to obtain ...

Embodiment 2

[0031] Step 1: (1) Mix 4 parts of m-phenylenediamine, 0.08 parts of sodium dodecylbenzenesulfonate, 8 parts of thionyl chloride, 5 parts of glycerin, and 180 parts of deionized water to form a mixed solution, using 0.8wt% camphorsulfonic acid solution, 0.5wt% sodium hydroxide solution to adjust pH=7.2 to obtain an aqueous phase solution; (2) dissolve the trimesoyl chloride solution in the Isopa-G solution to obtain an oil phase solution with a concentration of 20wt% (3) Add the coated bacteria into n-hexane and mix evenly, add 1v / v% linoleic acid, set the temperature at 25°C and react for 2 hours; centrifuge to obtain n-hexane extract. (4) Place the polysulfone support membrane in the water phase solution and immerse for 1 minute to remove excess water phase solution; transfer to the oil phase solution for interfacial polymerization for 2 minutes; place it in n-hexane extract solution for activation for 1 minute; set the temperature to 75 ℃ drying for 5 minutes to obtain a pol...

Embodiment 3

[0034] Step 1: (1) Mix 6 parts of m-phenylenediamine, 0.12 parts of sodium dodecylbenzenesulfonate, 12 parts of thionyl chloride, 8 parts of glycerin, and 240 parts of deionized water to form a mixed solution, using 0.8wt% Camphorsulfonic acid solution, 0.5wt% sodium hydroxide solution to adjust pH=8.0 to obtain an aqueous phase solution; (2) Dissolving the trimesoyl chloride solution in the Isopa-G solution to obtain an oil phase solution with a concentration of 25wt% (3) Add the coated bacteria into n-hexane and mix evenly, add 3v / v% linoleic acid, set the temperature at 30°C and react for 4 hours; centrifuge to obtain n-hexane extract. (4) Place the polysulfone support membrane in the water phase solution for 2 minutes to remove excess water phase solution; transfer to the oil phase solution for interfacial polymerization for 3 minutes; place it in n-hexane extract solution for activation for 3 minutes; set the temperature to 82 ℃ drying for 8 minutes to obtain a polyamide ...

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Abstract

The invention discloses a composite reverse osmosis membrane based on a water-soluble polymer and a preparation method thereof. The composite reverse osmosis membrane comprises the following steps: step 1, soaking a basic support membrane in a water phase solution for 1-2 minutes, and removing redundant water phase solution; transferring into an oil phase solution, and carrying out interfacial polymerization for 2-3 minutes; putting into an n-hexane extracting solution for activating; and drying to obtain the polyamide reverse osmosis membrane. Step 2, dipping the polyamide reverse osmosis membrane in a chitosan mixed solution; transferring the polyamide reverse osmosis membrane into a sodium hypochlorite solution for dipping, and putting the polyamide reverse osmosis membrane into a sodium hydrogen sulfate solution for dipping; washing with hot water to obtain the composite reverse osmosis membrane. The preparation method has the beneficial effects that (1) thionyl chloride and glycerol are added into a water-phase solvent, so that interfacial polymerization is increased; the permeability and the desalination rate of the polyamide reverse osmosis membrane are effectively improved by combining the activation of the normal hexane extracting solution; and (2) chitosan surface modification and sodium hypochloride oxidation are utilized to further improve the permeability, desalination rate and pollution resistance of the composite reverse osmosis membrane on the basis of ensuring the membrane strength.

Description

technical field [0001] The invention relates to the technical field of reverse osmosis membranes, in particular to a water-soluble polymer-based composite reverse osmosis membrane and a preparation method thereof. Background technique [0002] Reverse osmosis membrane is an artificial semipermeable membrane that uses the effect of higher than the osmotic pressure of the solution to separate substances; compared with microfiltration membranes, ultrafiltration membranes, etc., it is a fine membrane separation product that can intercept more than 0.0001 μm. It is the core component of reverse osmosis technology; it has the characteristics of high mechanical strength, high efficiency, and low energy consumption. It is widely used in seawater desalination, wastewater treatment and other projects, involving petrochemical, pharmaceutical, environmental protection, electric power and many other fields. [0003] Polyamide reverse osmosis membrane has become the most commonly used rev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/56B01D71/08B01D69/12B01D67/00B01D61/02
CPCB01D71/56B01D71/08B01D69/12B01D67/0002B01D61/025Y02A20/131
Inventor 徐建军姬志福武亚峰胡光洲
Owner 江苏安普林新材料研究院有限公司
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