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A kind of preparation method of low-pressure high-flux reverse osmosis membrane

A reverse osmosis membrane, low pressure and high technology, which is applied in the field of preparation of low pressure and high flux reverse osmosis membrane, can solve the problems of attenuation of desalination rate of membrane performance, insignificant improvement of membrane performance, uneven and stable water phase and oil phase solution, etc. Achieve obvious effect and avoid obvious reduction of membrane desalination rate

Active Publication Date: 2016-02-17
BEIJING ORIGIN WATER FILM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the membrane performance improvement effect brought by these methods is not significant, because if the addition amount of these methods is too small, the impact on the membrane performance is also very small, and if the addition amount is too large, first, it will cause the dissolution of the water phase and the oil phase. Poor performance leads to inhomogeneity and stability of the water phase and oil phase solution, and the second is to cause a sharp attenuation of membrane performance, especially the desalination rate

Method used

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  • A kind of preparation method of low-pressure high-flux reverse osmosis membrane
  • A kind of preparation method of low-pressure high-flux reverse osmosis membrane
  • A kind of preparation method of low-pressure high-flux reverse osmosis membrane

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Embodiment 2

[0020] Prepare a 3wt% mass fraction of m-phenylenediamine solution, and add different mass fractions of 3-hydroxymethylmorpholine (additions include 2wt%, 4wt%, and 6wt%) to it at the same time, then stir evenly, and then prepare 0.08wt % n-hexane solution of polyfunctional acid chloride, fix the polysulfone ultrafiltration membrane (molecular weight cut-off 68000 or so) on the glass plate, then insert the glass plate into the aqueous phase solution, after standing for 10s, take out the glass plate, and then put the membrane After the aqueous phase on the surface dries. Then insert the glass plate into the oil phase solution, place it for 10 seconds, take out the glass plate, and after the organic solvent on the membrane surface is completely volatilized, a high-flux reverse osmosis membrane is prepared, and the prepared membrane is soaked in pure water for testing . Present embodiment is to NaCl solution cut-off test result such as figure 2 shown.

Embodiment 3

[0022] Prepare a 3wt% mass fraction of m-phenylenediamine solution, and simultaneously add 4wt% mass fraction of 4-chloro-2-hydroxypyridine, 2-hydroxyethylpyridine, 4-hydroxyethylmorpholine, 4-benzyl -2-Hydroxymorpholine, then stir evenly, then prepare 0.08wt% n-hexane solution of polyfunctional acid chloride, fix the polysulfone ultrafiltration membrane (about 68000 molecular weight cut-off) on the glass plate, and then insert the glass plate In the aqueous phase solution, after standing for 10s, take out the glass plate, and then dry the aqueous phase on the surface of the membrane. Then insert the glass plate into the oil phase solution, place it for 10 seconds, take out the glass plate, and after the organic solvent on the membrane surface is completely volatilized, a high-flux reverse osmosis membrane is prepared, and the prepared membrane is soaked in pure water for testing . Present embodiment is to NaCl solution cut-off test result such as image 3 shown.

Embodiment 4

[0024] Prepare a 3wt% mass fraction of m-phenylenediamine solution, while adding 4wt% mass fraction of 4-hydroxypyridine, 2-methyl-3-hydroxypyridine, 2-amino-3-hydroxypyridine, 3-hydroxyl-2 -Nitropyridine, 2-hydroxyethylmorpholine, and then stir evenly, then prepare 0.08wt% n-hexane solution of multifunctional acid chloride, and fix the polysulfone ultrafiltration membrane (about 68000 molecular weight cut-off) on a glass plate , and then insert the glass plate into the aqueous phase solution, after standing for 10s, take out the glass plate, and then dry the aqueous phase on the surface of the membrane. Then insert the glass plate into the oil phase solution, place it for 10 seconds, take out the glass plate, and after the organic solvent on the membrane surface is completely volatilized, a high-flux reverse osmosis membrane is prepared, and the prepared membrane is soaked in pure water for testing . Present embodiment is to NaCl solution cut-off test result such as Figure...

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Abstract

The invention discloses a preparation method of a low-pressure and high-flux reverse osmosis membrane. The preparation method comprises the following steps: (1) sticking a base membrane onto a glass plate, inserting and immersing the glass plate into an amines water-phase monomer solution, taking out the glass plate and removing surface liquid; and (2) inserting and immersing the glass plate into a multifunctional acyl chloride oil-phase solution, taking out the glass plate, drying, and adding an additive into the water-phase monomer solution in the step (1), wherein 1-20 parts by weight of the additive is added into each 100 parts by weight of the water-phase monomer solution and the additive is a hydroxyl pyridine derivative or a hydroxyl morpholine derivative. According to the preparation method, the flux of the membrane can be obviously improved while the desalting rate is not obviously reduced; the raw materials of the additive are cheap and easily available and are industrialized products, so that the industrialized amplified production is convenient to realize.

Description

technical field [0001] The present invention relates to a preparation method of reverse osmosis membrane, specifically, the present invention relates to the preparation of a low-pressure high-flux reverse osmosis membrane by adding additives to the aqueous phase monomer solution to improve the flux of the reverse osmosis membrane method. Background technique [0002] Due to the dense desalination layer on the surface of the existing commercial RO membrane, the flux is low. Many researchers add many hydrophilic small molecule additives to the water phase and oil phase to affect the reaction in the interfacial polymerization reaction. Increase the porosity of the polyamide desalination layer to increase the flux of the membrane, but generally the degree of increase in flux is low, and at the same time, the desalination rate of the membrane decreases more due to the decrease in the density of the desalination layer. For example, some existing people who prepare high-flux RO me...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/12B01D67/00B01D69/02B01D71/68
Inventor 陈亦力彭鹏刘德祥李锁定夏建中
Owner BEIJING ORIGIN WATER FILM TECH