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Linear-crosslinked multi-component copolymerized polyamide reverse osmosis membrane for sea water desalination and preparation method thereof

A technology of copolymerized polyamide and multicomponent copolymerization, which is applied in the field of linear-crosslinked multicomponent copolymerized polyamide reverse osmosis membrane for seawater desalination and its preparation, and can solve the problem of large intermolecular free volume, low sodium chloride rejection, water The flux cannot be further improved, etc., to achieve the effect of high retention rate, good mechanical and physicochemical properties

Active Publication Date: 2020-07-03
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, limited by the molecular structure of aromatic cross-linked polyamide, polyamide seawater desalination membranes still have no breakthrough development after a long development process.
The cross-linked polyamide seawater desalination membrane made of trimesoyl chloride and m-phenylenediamine as monomers cannot further increase the water flux while ensuring the rejection rate is higher than 99% due to the limitation of the dense cross-linked structure.
On the other hand, the polymerization of aromatic diacid chloride and aromatic diamine can only produce linear polyamide composite membranes, the molecular structure of the separation layer is loose, and the free volume between molecules is large. Although its water flux is fully cross-linked polyamide composite reverse osmosis More than 2 times that of the membrane, but the rejection rate of sodium chloride is less than 10%

Method used

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  • Linear-crosslinked multi-component copolymerized polyamide reverse osmosis membrane for sea water desalination and preparation method thereof
  • Linear-crosslinked multi-component copolymerized polyamide reverse osmosis membrane for sea water desalination and preparation method thereof
  • Linear-crosslinked multi-component copolymerized polyamide reverse osmosis membrane for sea water desalination and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0036] Example 1: The organic phase solution used in the interfacial polymerization reaction in the experiment is n-hexane solution of trimesoyl chloride and diacid chloride monomers in different proportions. The MPD / TMC polyamide reverse osmosis composite membrane was prepared, the concentration of TMC was 0.1 wt%, the mass ratio of MPD and TMC was 20:1, and the molar ratio of amine groups to acid chloride groups was calculated to be 33:1. The interfacial reaction time is 60 seconds, and the temperature range of the interfacial polymerization reaction is 25 degrees Celsius. In the experiment, the molar ratio of the amine group and the acid chloride group was kept constant, and the proportion of the acid chloride functional group occupied by the TMC and the diacid chloride monomer was adjusted. Taking isophthaloyl chloride (IPC) and trimesoyl chloride as organic phase monomers as an example, the molar ratios of the acid chloride functional groups occupied by TMC and IPC are 1:...

example 2

[0046] Example 2: SEM characterization of the surface of the reverse osmosis membrane prepared by trimesoyl chloride, trimesoyl chloride, ortho-, m-, and terephthaloyl chloride. For pure trimesoyl chloride, the granular structure and the "leaf" structure in the picture coexist, and the overall structure is densely arranged; for the samples of trimesoyl chloride and isophthaloyl chloride, the "leaf" structure is mixed with some granular structure, showing a "peak-trough" rough shape; trimesoyl chloride and phthaloyl chloride samples, the surface forms a convex structure, and the inside of the convex part has a depression or a hole-like structure; while for the trimesoyl chloride and phthaloyl chloride samples, For the samples of triformyl chloride and terephthaloyl chloride, the "leaf-like" structure was significantly reduced, showing a fragmented and dense distribution.

example 3

[0047] Example 3: Since the base material will have a great influence on the separation performance of the prepared reverse osmosis membrane, the selection of the base material is carried out first, and US020, electrospun membrane, imported PS20 and domestic PS20 are selected for comparison. Among them, the average pore diameter of the microfiltration electrospun membrane is 0.5 micron; the average pore diameter of the ultrafiltration membrane is 25 nanometers. MPD / TMC reverse osmosis membranes were prepared through the interfacial polymerization step in Example 1 using different substrates. Studies have shown that substrate PS20 works best.

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Abstract

The invention relates to a linear-crosslinked multi-component copolymerized polyamide reverse osmosis membrane for seawater desalination and a preparation method thereof. According to the preparationmethod, interfacial polymerization reactions among phthaloyl chloride, m-phthaloyl chloride, p-phthaloyl chloride, o-phenylene diamine, m-phenylene diamine and p-phenylene diamine are carried out to prepare the linear polymer, meanwhile, a third component namely trimesoyl chloride is introduced to realize partial crosslinking to obtain the sea water desalination membrane with a linear-crosslinkedmulti-component copolymerization structure, and the reverse osmosis membrane can be used in the fields of efficient sea water desalination, brackish water desalination and the like.

Description

technical field [0001] The invention relates to the technical field of preparing seawater desalination reverse osmosis membranes, in particular to a linear-crosslinked multi-component copolymerized polyamide reverse osmosis membrane for seawater desalination and a preparation method thereof, in particular to aromatic diamine monomers and aromatic diacid chlorides The monomer is prepared by interfacial polymerization while the linear polyamide structure is prepared, and at the same time, the aromatic triacyl chloride is introduced to form a linear-cross-linked copolymer structure reverse osmosis membrane preparation method. Background technique [0002] Seawater desalination technology has experienced more than half a century of development, and the reverse osmosis membrane technology with cross-linked polyamide as the filter layer still dominates the market. Usually, the cross-linked polyamide reverse osmosis membrane is based on ultrafiltration or microfiltration membrane, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/56B01D69/12B01D69/02B01D67/00B01D61/02C02F1/44C02F103/08
CPCB01D61/025B01D67/0006B01D69/02B01D69/125B01D71/56B01D2325/24B01D2325/30C02F1/441C02F2103/08Y02A20/131
Inventor 马洪洋张文才袁颖
Owner BEIJING UNIV OF CHEM TECH
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