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High-performance composite forward osmosis membrane based on polyolefin microporous substrate and preparation method of high-performance composite forward osmosis membrane

A forward osmosis membrane, olefin-based membrane technology, applied in the field of preparation methods and obtained membranes, can solve the problems of raw material liquid pollution, driving solute loss, water flux reduction, etc., and achieve high FO water flux, low specific reaction Toward solute flux, reducing the effect of reverse solute diffusion

Active Publication Date: 2021-10-22
SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Reverse solute diffusion will lead to contamination of raw material solution, loss of driving solute, and reduction of water flux by reducing the salt concentration difference on both sides of the membrane, which limits the application of the above-mentioned FO membranes.

Method used

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  • High-performance composite forward osmosis membrane based on polyolefin microporous substrate and preparation method of high-performance composite forward osmosis membrane
  • High-performance composite forward osmosis membrane based on polyolefin microporous substrate and preparation method of high-performance composite forward osmosis membrane
  • High-performance composite forward osmosis membrane based on polyolefin microporous substrate and preparation method of high-performance composite forward osmosis membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The FO membrane of the present invention is prepared as follows. The porous polyethylene film (thickness 12μm, average pore size 42nm) was modified by oxygen plasma hydrophilization, the power was 30W, the vacuum chamber pressure was about 500mTorr, and the modification time was 30s. Then pour the water phase on the surface of the support layer, the water phase contains 2.0wt.% m-phenylenediamine and 0.1wt.% sodium lauryl sulfate, keep the water phase in contact with the support layer for 2min, and remove the membrane after pouring out The residual water phase on the surface, then pour 0.1wt.% trimesoyl chloride n-hexane solution on the support layer, keep the organic phase in contact with the support layer for 1min, rinse the surface with n-hexane after pouring it out, and let it dry in the air .

[0034] Membrane FO performance, including water flux, was tested using the FO test setup J v and specific reverse salt flux J s / J v . The temperature is 25° C., and th...

Embodiment 2

[0038] The membrane was prepared according to the method of Example 1, and the membrane was compacted with pure water in a cross-flow filtration test system with a hydraulic pressure of 13 bar until the water flux was stable.

[0039] The RO performance of the membrane was tested with a cross-flow filtration test device, including the pure water permeability coefficient A and the salt rejection rate R. The pressure is 10bar, the temperature is 25°C, the cross-flow velocity is 25cm / s, and the raw materials are pure water and 1000mg / L NaCl, MgCl 2 and LiCl. The test results are shown in Table 2. The FO performance of the membrane was tested with the FO test device, the test method was the same as in Example 1, and the FO performance test results are shown in Table 3.

[0040] Table 2 Membrane RO performance

[0041]

[0042] Table 3 Membrane FO performance

[0043]

[0044]

Embodiment 3

[0046] The membrane was prepared according to the method in Example 1, and then the membrane was soaked in benzyl alcohol for 2 minutes, and fully rinsed with pure water after taking it out.

[0047] The FO performance of the membrane was tested according to the method of Example 1, and the results are shown in Table 4.

[0048] Table 4 Membrane FO performance

[0049]

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Abstract

The invention relates to a high-performance composite forward osmosis membrane based on a polyolefin microporous substrate and a preparation method of the high-performance composite forward osmosis membrane. The preparation method comprises the following steps: firstly, carrying out hydrophilic modification on a polyolefin base membrane, carrying out interfacial polymerization on the surface of the modified base membrane to preliminarily obtain a composite membrane, and carrying out thermal crosslinking treatment or no treatment after the interfacial polymerization reaction is finished, wherein the monomers adopted in interfacial polymerization are a polyamine and a poly acyl chloride; finally, improving the forward osmosis performance of the membrane through post-treatment. The polyolefin base membrane is especially a porous polyethylene film, the film thickness is 5-100 [mu] m, and the average pore size is 20-100 nm. The post-treatments include chemical treatments, hydraulic compaction treatments, and combinations thereof. Compared with commercial forward osmosis membranes and forward osmosis membranes reported in literatures, the membrane has higher water flux, lower reverse salt diffusion, excellent mechanical properties and chemical stability and lower cost.

Description

technical field [0001] The invention relates to the field of membrane technology, in particular to a preparation method of a composite forward osmosis membrane with polyolefin as a base membrane and the obtained membrane. Background technique [0002] Forward osmosis (FO) is a desalination, separation and concentration process driven by osmotic pressure. Different from the conventional reverse osmosis (RO) or nanofiltration (NF) process, to realize the concentration of feed liquid or water reuse, there needs to be a drive solution on the other side of the semi-permeable membrane with an osmotic pressure much higher than that of the feed liquid. Driven by the high osmotic pressure driving fluid, the solute in the feed liquid is separated through the semi-permeable membrane; the driving fluid is diluted and then concentrated to realize water reuse and purification. From a thermodynamic point of view, the energy consumed by forward osmosis to complete the entire cycle is great...

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D61/00B01D67/00B01D71/26C02F1/44
CPCB01D69/12B01D61/002B01D67/0006B01D71/26C02F1/445Y02A20/131
Inventor 何涛窦鹏佳孙楠徐姗姗翟文涛
Owner SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI