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A linear-crosslinked multi-component copolymerized polyamide reverse osmosis membrane for seawater desalination and its preparation method

A technology of copolyamide and multi-component copolymerization, which is applied in the field of linear-crosslinked multi-component copolyamide reverse osmosis membrane and its preparation for seawater desalination, and can solve the problem of large intermolecular free volume, no breakthrough development, chlorine Sodium chloride rejection rate is small, etc.

Active Publication Date: 2021-04-23
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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  • A linear-crosslinked multi-component copolymerized polyamide reverse osmosis membrane for seawater desalination and its preparation method
  • A linear-crosslinked multi-component copolymerized polyamide reverse osmosis membrane for seawater desalination and its preparation method
  • A linear-crosslinked multi-component copolymerized polyamide reverse osmosis membrane for seawater desalination and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0036]Example 1: The organic phase solution used in the experimental interface polymerization was used as a different proportion of the n-hexane solution of a xylophenylel chloride and a diacyl chloride monomer. The MPD / TMC polyamide reverse osmosis composite film was prepared, and the mass ratio of the TMC concentration of 0.1 wt%, MPD and TMC was 20: 1, and the molar ratio of the amine group and the acyl chloride group was calculated from 33: 1. The interface reaction time is 60 seconds, and the temperature range of interface polymerization is 25 degrees Celsius. The molar ratio of the remodeling of the amine group and the acid chloride group is unchanged, and the ratio of TMC and diacyl chloride monomers occupy an acid function group. As an organic phase monomer as an organic phase monomer, TMC and IPC has a molar ratio of 1: 0, 4: 1, 3: 1, 2: 1, 1: 1: 0, 4: 1, 3: 1, 2: 1, 1: 1, 1: 2, 1: 3, 1: 4, 1: 5, 1: 6, 1: 8, 1: 10, 0: 1, as shown in the following table.

[0037]Table 1 xylop...

example 2

[0046]Example 2: Trial chloride, xylophenyl chloride, and phthal chloride, a reverse osmosis membrane surface prepared by benen dikylel chloride. For pure benzophenylel chloride, the particulate structure and "blade" structure are commonly present, and the overall structure is integrated; for the phenylethyl chloride and the amphimethyl chloride sample, "blade" shaped structure Structure, exhibiting "peak-wave valley" rough morphology; xylophenyl trimethyl chloride and the structure of the adjacent xylel chloride, and the surface forms a projection, and there is a recess or a pore structure in the protruding portion; Trimethyl chloride and the terephthal chloride sample, the "leaf-shaped" structure is significantly reduced, and a zero-fraud is dense distribution.

example 3

[0047]Example III: Since the substrate has a large impact on the separation performance of the obtained reverse osmosis membrane, the selection of the substrate is first selected, and the US020, the electrospun film, the imported PS20 and the domestic PS20 are compared. Among them, the average pore diameter of the microfiltration electrospun film is 0.5 microns; the an average aperture of the ultrafiltration membrane is 25 nm. MPD / TMC reverse osmosis membrane was prepared by using different substrates to polymerize the interface polymerization in Example No. 1. Studies have shown that the substrate PS20 is optimal.

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Abstract

The invention relates to a linear-crosslinked multi-component copolymerized polyamide reverse osmosis membrane used for seawater desalination and a preparation method thereof. Phthaloyl chloride, isophthaloyl chloride, terephthaloyl chloride and o-phenylenediamine, m-phenylenediamine, and p-phenylenediamine are respectively interfacially polymerized to prepare linear polymers, and a third group is introduced Partial cross-linking of trimesoyl chloride is obtained to obtain a seawater desalination membrane with a linear-crosslinked multi-copolymer structure, which can be used in high-efficiency seawater desalination, brackish water desalination and other fields.

Description

Technical field[0001]The present invention relates to the manufacture of seawater desalination reverse osmosis membranes, and more particularly to a linear-crosslinked multi-copolymer polyamide reverse osmotic membrane for seawater deceased and preparation method thereof, particularly by aromatic diamine monomer and aromatic diocanoyl chloride. When the monomer is prepared by the interfacial polymerization, it is introduced into the anti-osmosis membrane of the aromatic trioyl chloride to form a linear-crosslinked copolymerization.Background technique[0002]The seawater desalination technology has experienced more than half a century, and ultimately the market is still a reverse osmotic membrane technology of crosslinking polyamide as a filter layer. Typically, the crosslinked polyamide reverse osmosis membrane is a substrate with ultrafiltration or microfiltration membrane, and is dissolved in n-hexane and water as an organic phase and aqueous phase in n-hexane and water, respective...

Claims

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Application Information

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Patent Type & Authority Patents(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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