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A kind of polyamide reverse osmosis composite membrane and preparation method thereof

A technology of reverse osmosis composite membrane and polyamide, applied in the direction of semi-permeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve the problem that the water permeability and salt removal rate cannot reach the ideal level, the rejection rate is not ideal, and the process is cumbersome To achieve the effect of increasing retention rate and flux, improving chemical resistance stability, and improving hydrophilicity

Active Publication Date: 2017-04-26
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent CN101381125 adds a phase transfer agent in the water phase, such as a quaternary ammonium salt, which improves the flux of the RO membrane, but the rejection rate is still not ideal
[0007] At present, by adding additives when preparing a dense ultra-thin functional layer on the base membrane or performing appropriate treatment after the composite membrane is manufactured, the water permeability and salt removal rate cannot reach the ideal level; in addition, these methods have environmental pollution or process cumbersome and other issues

Method used

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  • A kind of polyamide reverse osmosis composite membrane and preparation method thereof
  • A kind of polyamide reverse osmosis composite membrane and preparation method thereof
  • A kind of polyamide reverse osmosis composite membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-4

[0045]Dissolve polysulfone and polyarylethersulfone with pendant carboxyl groups (structural formula 1) in DMF, defoam and filter to prepare casting solution. Among them, the content of polysulfone in the casting solution is 16wt%, and the type and amount of polyarylethersulfone with side carboxyl groups are shown in Table 1. Then, the reverse osmosis composite membrane was prepared by the same porous support layer preparation process as in the comparative example. The test conditions were the same as those of the comparative example, and the results are shown in Table 1.

Embodiment 5-7

[0047] Polyethersulfone and polyarylethersulfone with side carboxyl groups (structural formula 2) were dissolved in DMF, defoamed and filtered to prepare the casting solution. Among them, the content of polysulfone in the casting solution is 16wt%, and the type and amount of polyarylethersulfone with side carboxyl groups are shown in Table 1. Then, the reverse osmosis composite membrane was prepared by the same porous support layer preparation process as in the comparative example. The test conditions were the same as those of the comparative example, and the results are shown in Table 1.

Embodiment 8-10

[0049] Polysulfone and polyarylethersulfone with pendant carboxyl groups (structural formula 4) were dissolved in DMF, defoamed and filtered to prepare the casting solution. Among them, the content of polysulfone in the casting solution is 16wt%, and the type and amount of polyarylethersulfone with side carboxyl groups are shown in Table 1. Then, the reverse osmosis composite membrane was prepared by the same porous support layer preparation process as in the comparative example. The test conditions were the same as those of the comparative example, and the results are shown in Table 1.

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Abstract

The present invention provides a polyamide reverse osmosis composite membrane and a preparation method thereof. According to the present invention, polyarylene ether sulfone with side carboxyl is added to a membrane casting liquid of a support layer to prepare a porous support layer of a reverse osmosis composite membrane, and a reverse osmosis function layer is compounded on the porous support membrane, wherein the hydrophilicity of the support layer and the binding performance between the polyamide function layer and the support layer are increased through the polyarylene ether sulfone with side carboxyl so as to increase the chemical resistance stability of the composite membrane interface, and the flux and the salt retention rate of the reverse osmosis composite membrane are improved. The method of the present invention has the simple process and is suitable for industrial production.

Description

technical field [0001] The invention relates to a polymer reverse osmosis membrane, in particular to a polyamide reverse osmosis composite membrane and a preparation method thereof. Background technique [0002] In recent years, with the increasing shortage of global water resources and increasing water pollution, reverse osmosis technology has been more widely used and valued in the fields of seawater desalination and water reuse. The core technology of reverse osmosis is the manufacturing technology of reverse osmosis membrane. Asymmetric reverse osmosis membrane and reverse osmosis composite membrane are two types of high-performance reverse osmosis membranes that have been commercially applied at present. Among them, the reverse osmosis composite membrane can optimize each layer to achieve the best performance, the ultra-thin functional layer can be optimized to the ideal selective permeability, and the support layer can achieve the best strength and pressure resistance....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/56B01D69/12B01D69/10B01D67/00
Inventor 潘国元张扬刘轶群严昊郭敏
Owner CHINA PETROLEUM & CHEM CORP
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