Preparation method for ultra-low-pressure high-flux reverse osmosis membrane

A reverse osmosis membrane, high-flux technology, applied in semi-permeable membrane separation, chemical instruments and methods, osmosis/dialysis water/sewage treatment, etc., can solve the limited improvement of reverse osmosis membrane water flux, loose desalination layer performance Instability, unstable flux and other problems, to achieve the effect of improving water flux, increasing the reaction interface, and increasing the reactivity

Active Publication Date: 2015-05-13
北京碧水源智慧科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to increase the efficiency of the reverse osmosis membrane and reduce its operating pressure, in the current research on many kinds of water flux enhancement, on the one hand, the improvement of the water flux of the reverse osmosis membrane is limited, and most of them are even great. Most of them are exchanged for sacrificing a large amount of desalination rate, and the flux is increased by forming a loose desalination layer, because the performance of the loose desalination layer is extremely unstable, so the flux is easily attenuated, that is, the increase of the flux is unstable. state, the initial flux is high after improvement, but the flux decays seriously after running for a period of time

Method used

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  • Preparation method for ultra-low-pressure high-flux reverse osmosis membrane

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Immerse the polysulfone-coated non-woven fabric base film in an aqueous solution containing 2% m-phenylenediamine (MPD) for 40s, and remove the excess water phase after taking it out;

[0024] Soak the wet film in an oil phase solvent containing 0.15% TMC for 30 seconds. After removing the excess residual liquid, a polyamide dry film is obtained. As a preference, the oil phase solvent of the present invention is ISOPARG in the isoparaffin oil phase solvent;

[0025] The prepared polyamide dry membrane was placed in an oven to dry for 3 minutes, and then immersed in pure water for washing for 5 minutes after being taken out, and a high flux reverse osmosis membrane was prepared.

[0026] Tested by a flat-panel tester, the flux of this wet membrane is 22.53LMH, the salt rejection rate is 98.6%, and the unit of water flux is L / m / h (LMH).

Embodiment 2

[0028] Immerse the polysulfone-coated non-woven fabric base film in an aqueous solution containing 2% m-phenylenediamine (MPD) for 40s, and remove the excess water phase after taking it out;

[0029] Soak the wet film in ISOPARG containing 0.15% trimesoyl chloride (TMC) and 0.05% phthalate (lipid) oil phase solution ISOPARG for 30s. After removing excess residual liquid, a dry polyamide is obtained. membrane;

[0030] The prepared polyamide dry membrane was placed in an oven to dry for 3 minutes, and then immersed in pure water for washing for 5 minutes after being taken out, and a high flux reverse osmosis membrane was prepared.

[0031] Tested by a flat tester, the water flux of this wet membrane is 27.81LMH, and the salt rejection rate is 97.9%.

Embodiment 3-6

[0033] The parameter control of each step is the same as in Examples 1 and 2. The components, proportions, and test results of Examples 3-6 are shown in Table 1:

[0034] Table 1 Components, proportions and test results of Examples 3-6

[0035]

[0036] It can be seen that adding a small amount of phthalates to the oil phase solution can significantly increase the flux of the membrane, but the salt rejection rate does not decrease. With the increase of the concentration, the performance of the membrane is slightly improved, so The phthalate concentration is 0.25%.

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Abstract

The invention provides a preparation method for an ultra-low-pressure high-flux reverse osmosis membrane. The method specifically comprises the following steps: S1: preparation of an aqueous solution; S2: preparation of an oil phase solution; S3: preparation of a dry polyamide membrane; and S4, preparation of the reverse osmosis membrane. According to the invention, lipid and ketone derivatives are added in the oil phase solution; the lipid materials and polybasic acyl chloride in an oil phase undergo complexation reaction, so the reaction activity of polybasic acyl chloride is greatly increased; and the ketone materials change dissolution difference between an aqueous phase and the oil phase, so the diffusion ability of polybasic amine monomer to an organic phase is enhanced, the reaction interface of interfacial polymerization is increased, and the effective area of the reverse osmosis membrane is increased, thereby increasing the water flux of the membrane.

Description

Technical field [0001] The invention relates to the technical field of reverse osmosis membranes, in particular to a preparation method of ultra-low pressure and high flux reverse osmosis membranes. Background technique [0002] Membrane separation technology is a common treatment technology in today's water treatment. Among them, reverse osmosis membrane separation technology has become the current membrane separation technology because of its good separation performance for organic small molecules and inorganic salt ions, safety, environmental protection and good stability. Technology is one of the key technologies used in water treatment. [0003] The working mechanism of reverse osmosis membrane determines its characteristics of high operating pressure and low water output. At present, reverse osmosis membranes are usually prepared by interfacial polymerization. The main preparation process is: coating a polysulfone-based membrane layer on a non-woven support layer. The polysu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/56B01D67/00C02F1/44
Inventor 梁辉赵旭鲁纯
Owner 北京碧水源智慧科技股份有限公司
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