Reverse osmosis membrane with high flux and high desalination rate and preparation method thereof

A reverse osmosis membrane, high desalination technology, applied in reverse osmosis, semi-permeable membrane separation, chemical instruments and methods, etc., can solve problems such as unsatisfactory, high flux, desalination rate, and lower desalination rate, and the method is simple , Improve permeability, good water permeability

Inactive Publication Date: 2020-08-18
BEIJING ORIGIN WATER FILM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the prior art shows that most of the methods to increase the flux of reverse osmosis membranes will face the trade-off problem, that is, although the flux can be increased, the salt rejection rate will decrease accordingly
[0004] Most of the existing commercial reverse osmosis membranes use the interfacial polymerization (IP) process, and the interfacial polymerization of amine monomers and acid chloride monomers is carried out on the base membrane to prepare polyamide composite films (TFC) with high salt rejection rate, but this A polyamide composite film still fails to meet the needs of higher flux and salt rejection

Method used

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  • Reverse osmosis membrane with high flux and high desalination rate and preparation method thereof
  • Reverse osmosis membrane with high flux and high desalination rate and preparation method thereof
  • Reverse osmosis membrane with high flux and high desalination rate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment 1 takes polysulfone as the preparation of the reverse osmosis membrane of base membrane

[0033] According to the knowledge already mastered by those skilled in the art, the non-woven polysulfone ultrafiltration membrane is used as the substrate, and the substrate is sequentially passed through the water phase solution tank with a mass fraction of 4.5% m-phenylenediamine by using a coating device to remove excess water. After the phase is passed through a tank of trimesoyl chloride isoparaffin solution with a mass fraction of 0.3%, the water phase and the oil phase are interfacially polymerized at the water-oil interface, and then dried in an oven at 60° C. to obtain a reverse osmosis membrane.

Embodiment 2

[0034] Embodiment 2 takes polyolefin as the preparation of the reverse osmosis membrane of base film

[0035] Similarly, according to the knowledge already mastered by those skilled in the art, a commercially available lithium-ion battery separator (such as the HS20 product sold by Shanghai Enjie Company) is wetted in isopropanol, and then rinsed with pure water until the isopropanol is completely replaced. Propanol, spread the wet PE-based film on a glass plate, remove excess water with a rubber roller, and fix a silica gel frame on the surface of the film, pour a 4.5% m-phenylenediamine aqueous solution into the silica gel frame and soak for 60s, Then remove the excess water phase on the surface of the membrane, quickly pour the isoparaffin solution of trimesoyl chloride with a mass fraction of 0.3% into a silica gel frame for interfacial polymerization reaction for 60 seconds, and then dry it in an oven at 60°C to obtain a reverse osmosis membrane .

Embodiment 3～6

[0036] Embodiment 3~6 investigates the influence of different solvents on the performance of the reverse osmosis membrane of embodiment 1

[0037] Configure benzyl alcohol, benzyl alcohol / isopropanol with a volume ratio of 3:1, benzyl alcohol / isopropanol with a volume ratio of 2:1 and benzyl alcohol / isopropanol with a volume ratio of 1:1, according to the teaching of the prior art ( As by the method taught in Charles M. Hansen's HANSENSOLUBILITY PARAMETERS A User's Handbook), calculate and confirm the difference R of each solvent with polyamide in three-dimensional space a Both satisfy the relationship 4.0≤R a ≤15.5.

[0038] Soak the polysulfone reverse osmosis membrane in Example 1 in the above solvent for 20 seconds respectively, as Examples 3-6. Then rinse with deionized water to completely remove the residual organic solvent on the membrane, and finally dry it.

[0039] At 150psi and water temperature 20-28℃, the effective area of ​​the membrane is 42.40cm 2 The flux an...

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Abstract

The invention provides a reverse osmosis membrane with a high flux and a high desalination rate and a preparation method thereof. The reverse osmosis membrane is respectively subjected to a solvent activation treatment and a nitrification treatment; in the solvent activation treatment, to the reverse osmosis membrane is soaked in an organic solvent, and the difference (Ra) between the organic solvent and a desalination layer material in a three-dimensional space meets the relationship that Ra is greater than or equal to 4.0 and less than or equal to 15.5, and Ra=[4([delta]d2-[delta]d1)2+([delta]p2-[delta]p1)2+([delta]h2-delta[h1])2]1 / 2. The relationship between an activation solvent and a reverse osmosis membrane desalination layer material is researched; a specific solvent is selected foractivating the reverse osmosis membrane, under the assistance of a nitrification treatment, a desalination layer of the reverse osmosis membrane is effectively expanded, the desalination layer is more open in structure and better in water permeability, and the permeability of the membrane is remarkably improved while the desalination rate of the membrane is kept.

Description

【Technical field】 [0001] The invention relates to the technical field of reverse osmosis membranes, in particular to a reverse osmosis membrane with high flux and high desalination rate, and also relates to a preparation method of the reverse osmosis membrane. 【Background technique】 [0002] Reverse osmosis (RO) membrane technology is a key technology for efficient, low-cost, and sustainable supply of clean water, which can effectively remove dissolved salts, small molecular acids, phenols, aldehydes, colloids, microorganisms, etc. in water. It plays an important role in desalination of seawater, desalination of brackish water, and industrial wastewater treatment of municipal wastewater, petrochemical industry, printing and dyeing, etc. [0003] At present, there is an increasing demand for household water purifiers with suitable desalination rate and high flux, so it is imperative to increase the flux of household reverse osmosis membranes. However, the prior art shows tha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/02B01D67/00B01D71/26B01D71/68
CPCB01D61/025B01D67/0002B01D71/26B01D71/68Y02A20/131
Inventor 陈亦力韩洪蕊况武夏建中王中阳
Owner BEIJING ORIGIN WATER FILM TECH
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