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A kind of preparation method of the silicone rubber composite membrane that is used for organic vapor recovery

A silicone rubber composite membrane, organic vapor technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve problems such as large environmental pollution, high energy consumption, and complex process flow

Active Publication Date: 2021-06-22
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation of PVDF porous membrane by a single NIPS method requires a lot of process parameters to be adjusted; when the TIPS method is used to prepare the membrane, the dissolution temperature of the polymer is very high, usually higher than the melting point of PVDF, reaching above 180°C, which consumes a lot of energy and is used to dissolve polymers. Most of the solvents need to be extracted with organic solvents, the process is complicated and the environment is polluted

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] It is 12% by macromolecular PVDF mass percentage composition, the mass percentage composition of the second kind of macromolecular polyvinylpyrrolidone (PVP) is 12%, the solvent DMAc mass percentage composition is 68%, the quality of small molecule porogen magnesium chloride The percentage content is 8% to configure PVDF casting solution. First, magnesium chloride is completely dissolved in DMAc, then PVDF and PVP are added, stirred and heated at a constant temperature of 45°C to dissolve to form a completely uniform PVDF casting solution, and left to defoam. Afterwards, extrude the prepared PVDF casting solution above at 45°C in a spinneret with a double-channel structure to spin hollow fiber nascent membrane filaments. The inner channel is the core solution channel, and the outer channel is the casting solution. channel, the core liquid is water at 92°C, the flow rate of the casting liquid and the core liquid and the spinning speed are controlled, and after staying in ...

Embodiment 2

[0034] It is 16% by macromolecular PVDF mass percentage composition, the mass percentage composition of the second kind of macromolecular polyvinylpyrrolidone (PVP) is 4%, the solvent DMAc mass percentage composition is 72%, the quality of small molecule porogen magnesium chloride The percentage content is 8% to configure PVDF casting solution. Firstly, magnesium chloride is completely dissolved in DMAc, then PVDF and PVP are added, stirred and heated at a constant temperature of 43°C to dissolve to form a completely uniform PVDF casting solution, and left to defoam. Afterwards, extrude and spin the hollow fiber nascent membrane filaments from the above prepared PVDF casting liquid in a spinneret with a double-channel structure at 43°C. The inner channel is the core liquid channel, and the outer channel is the casting liquid. channel, the core liquid is water at 90°C, the flow rate of the casting liquid and the core liquid and the spinning speed are controlled, and after stayin...

Embodiment 3

[0036] It is 13% by macromolecular PVDF mass percentage composition, the mass percentage composition of second kind of macromolecular polyvinylpyrrolidone (PVP) is 3%, and solvent N-methylpyrrolidone (NMP) mass percentage composition is 74%, small The mass percentage of magnesium chloride, a molecular porogen, is 10% to configure the PVDF casting solution. First, the magnesium chloride is completely dissolved in NMP, and then PVDF and PVP are added, stirred and heated at a constant temperature of 73°C to form a completely uniform PVDF casting solution. Let stand to defoam. Afterwards, extrude and spin the hollow fiber nascent membrane filaments from the above prepared PVDF casting liquid in a spinneret with a double-channel structure at 73°C. The inner channel is the core liquid channel, and the outer channel is the casting liquid. channel, the core liquid is water at 93°C, the flow rate of the casting liquid and the core liquid and the spinning speed are controlled, and after...

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PUM

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Abstract

The invention discloses a method for preparing a silicone rubber composite membrane used for organic vapor recovery. By preparing a polymer membrane casting liquid system with a low critical solution temperature, the hollow fiber porous membrane is spun under a suitable membrane-making process condition. Then the silicon rubber composite membrane is prepared by coating the silicon rubber on the outer surface of the porous membrane. The polymer film casting liquid with low critical solution temperature used in the present invention is homogeneously stable at low temperature, but phase separation occurs at high temperature, and the corresponding film forming mechanism is different from the traditional thermally induced phase separation method. The hollow fiber porous membrane of the present invention has an ultra-thin outer skin layer, a sponge pore structure as the main body, and a high porosity. It is applied to the efficient recovery of organic vapor.

Description

technical field [0001] The invention belongs to the technical field of polymer membrane separation, and in particular relates to a preparation method of a silicone rubber composite membrane used for organic vapor recovery. Background technique [0002] During the production, storage, and transportation of petrochemical and related industries, a large amount of volatile organic compounds (VOCs) are released into the environment, which not only wastes resources, but also seriously pollutes the environment. The recovery of VOCs by membrane separation technology has the advantages of low energy consumption, simple process, continuous operation, no secondary pollution and high recovery rate, so it has broad application prospects. The selectivity of the membrane material plays a decisive role in the separation and recovery effect. It is generally believed that polymer rubber membranes such as silicone rubber (PDMS) membranes have good gas permeation and separation performance for ...

Claims

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Application Information

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IPC IPC(8): B01D71/70B01D69/12B01D67/00
CPCB01D67/0002B01D69/12B01D71/70
Inventor 赵晓雅肖通虎马金金
Owner NINGBO UNIV