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A high-throughput composite membrane preparation method

A composite membrane and high-flux technology, applied in the field of membrane separation, can solve the problems of limited scale application and structural instability in the chemical synthesis process, and achieve the effect of controllable membrane structure and performance, reduced thickness, and realized flux

Active Publication Date: 2018-01-30
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The above methods can improve the flux of interfacial polymeric membranes to varying degrees, but involve complex chemical synthesis processes, or involve more chemicals, or involve the risk of structural instability, which limits their large-scale application

Method used

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  • A high-throughput composite membrane preparation method
  • A high-throughput composite membrane preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Let the water phase solution (PIP) flow slowly on the PVC base membrane for 5 minutes, then purge the residual water phase solution on the surface of the membrane for 5 minutes, and then treat the module at -20°C for 2 minutes at low temperature, and install an insulation layer on the module after taking it out. maintain its temperature. Allow the organic phase solution (TMC) to flow slowly on the membrane surface for 2 minutes, then stop the flow, empty the residual solution, let it stand for 15 minutes, and wash it with pure water to be tested. The interception rate measured by this method is 93.98%, and the water flux is 36.75L / (m 2 h).

Embodiment 2

[0047] The low temperature treatment time in Example 1 was changed to 4min, and other conditions were unchanged, to prepare polyamide nanofiltration membrane. The interception rate measured by this method is 96.02%, and the water flux is 48.21L / (m 2 h).

Embodiment 3

[0049] The low temperature treatment time in Example 1 was changed to 6min, and other conditions were unchanged to prepare a polyamide nanofiltration membrane. The interception rate measured by this method is 95.95%, and the water flux is 52.83L / (m 2 h).

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Abstract

The invention discloses a membrane preparation method for realizing precise control of the thickness and the density degree of a composite membrane ultrathin separation layer by controlling the temperature of a two-phase monomer polymerization reaction. An ultrathin separation layer forming process, a membrane structure and performance are controllable by remarkably reducing an interfacial polymerization reaction rate through utilizing a low-temperature treatment process. The low-temperature treatment makes the membrane structure loose, reduces the thickness, and realizes the significant promotion of flux on the premise of guaranteeing the rejection performance of the composite membrane.

Description

technical field [0001] The invention belongs to the field of membrane separation, and relates to a composite membrane, in particular to a preparation method of a high-flux composite membrane. Background technique [0002] The membrane separation process is a process in which the selective separation membrane is used as the medium, and the concentration, pressure and potential are used as the driving force to make the components of the raw material selectively pass through the membrane to achieve separation. Because of its low energy consumption, large separation coefficient, strong process adaptability and no secondary pollution, it is widely used in seawater desalination, sewage treatment, petrochemical and biomedicine and other fields. [0003] The composite membrane is composed of a porous support layer and an ultra-thin separation layer attached to its surface. The porous support layer and the composite layer can be optimized separately. Because of its high separation pe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/56B01D69/12B01D67/00
Inventor 武春瑞刘四华王中阳吕晓龙孙学超
Owner TIANJIN POLYTECHNIC UNIV
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