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Polymer oxygen-enriched membrane with high flux and high selectivity as well as preparation method and application of same

A high-selectivity, high-molecular technology, applied in the direction of oxygen preparation, chemical instruments and methods, membrane technology, etc., can solve the problems of large film thickness, low air permeability coefficient, solubility limitation, etc.

Active Publication Date: 2013-07-10
JINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But there are problems: first, the separation coefficient of oxygen and nitrogen is low, It is only 2.0; the second is that the film-forming property is poor due to the small intermolecular force
There are mobile oxygen carriers in the liquid film, which can significantly improve However, the problems of the liquid film include: easy loss of solvent and oxygen carrier, large film thickness, low air permeability, and limitations of the operating temperature and the solubility of the oxygen carrier in the liquid medium, etc.
This result indicates that the oxygen-enriched membrane be further improved, but still not ideal

Method used

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  • Polymer oxygen-enriched membrane with high flux and high selectivity as well as preparation method and application of same
  • Polymer oxygen-enriched membrane with high flux and high selectivity as well as preparation method and application of same
  • Polymer oxygen-enriched membrane with high flux and high selectivity as well as preparation method and application of same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] Embodiment 1EPDM sulfonic acid cobalt ionomer (Co (II) -S-EPDM) solution preparation

[0066] 5g of EPDM was dissolved in 50ml of petroleum ether. Under stirring, 0.60 ml of concentrated sulfuric acid and 0.15 ml of acetic anhydride were added dropwise at room temperature. After reacting for 30 minutes, 5ml of ethanol was added, and then 0.75g of cobalt acetate was added for reaction. After the reaction, the pink Co (II) -The petroleum ether solution of S-EPDM, the concentration is about 0.1g / ml, ready for use.

Embodiment 2

[0068] According to the mass ratio of 95 / 5, in 10mL of tetrahydrofuran, add 0.95g of silicone rubber with a vinyl content of 10mol%, stir and dissolve, then add the Co prepared in Example 1 (II) -Petroleum ether solution of S-EPDM (where Co (II) The mass of -S-EPDM is 0.05g), and it is mixed evenly under stirring. Finally, 0.08 g of hydrogen-containing silicone oil cross-linking agent and 2 drops of chloroplatinic acid catalyst solution (accounting for 0.4-0.8% of the film-forming substance) were added in sequence. After stirring and mixing evenly, a circular frame is used to perform solution casting on a PET film to form a film. After aging for 24 hours, the membrane was peeled off from the PET film to obtain a pink translucent flexible high flux and high selectivity polymer oxygen-enriched membrane. The average thickness of the film is about 60 μm through multi-point measurement.

[0069] The air permeability of the film was determined according to the Stern volume method...

Embodiment 3

[0075] According to the mass ratio of 90 / 10, in 10 mL of tetrahydrofuran, add 0.90 g of silicone rubber with a vinyl content of 10 mol%, stir and dissolve, and then add the Co prepared in Example 1. (II) -Petroleum ether solution of S-EPDM (where Co (II) The mass of -S-EPDM is 0.10g), and it is mixed evenly under stirring. Finally, 0.08 g of hydrogen-containing silicone oil cross-linking agent and 2 drops of chloroplatinic acid catalyst solution (accounting for 0.4-0.8% of the film-forming substance) were added in sequence. After stirring and mixing evenly, a circular frame is used to perform solution casting on a PET film to form a film. After aging for 24 hours, the membrane was peeled off from the PET film to obtain a pink translucent flexible high flux and high selectivity polymer oxygen-enriched membrane. The average thickness of the film is about 60 μm through multi-point measurement.

[0076] According to the volumetric method, the membrane is under the conditions of...

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Abstract

The invention discloses a polymer oxygen-enriched membrane with high flux and high selectivity as well as a preparation method and application thereof. The polymer oxygen-enriched membrane contains silicon rubber and ternary ethylene propylene rubber cobalt sulfonate ionomer in mass ratio of 99:1 to 80:20. According to the invention, the preparation method comprises the steps of: mixing the tetrahydrofuran solution of the silicon rubber with the prepared petroleum ether solution of the ternary ethylene propylene rubber cobalt sulfonate ionomer; adding a silicon-hydrogen atom containing a cross-linking agent and a chloroplatinic acid catalyst to obtain a uniform solution before film formation; and forming a film on a medium by the uniform solution and aging to obtain the polymer oxygen-enriched membrane with high flux and high selectivity. Both PO2 and alphaO2 / N2 of the polymer oxygen-enriched membrane rise at a low pressure difference, for example, under the condition that the pressure difference is 0.02 MPa and the temperature is at 30 DEG C, PO2=790-680 Barrer, alphaO2 / N2=5.39-6.52 and the oxygen-enriched performance exceeds Robeson upper limit. The polymer oxygen-enriched membrane can be applied to separation and enrichment of oxygen or nitrogen in the air.

Description

technical field [0001] The invention relates to the field of high-performance polymer membrane materials, in particular to a polymer oxygen-enriched membrane with high flux and high selectivity under low pressure difference and its preparation method and application. Background technique [0002] Membrane gas separation has significant advantages such as energy saving, low carbon, no pollution, and simple equipment and operation. Oxygen-enriched membranes for separating and enriching oxygen from air are an important field of gas separation research. Oxygen-enriched air can be directly used to treat respiratory diseases and supplement oxygen in hypoxic environments, improve combustion efficiency, promote chemical reactions, carry out intensive fish farming and fermentation, and many other aspects. Research on combustion efficiency shows that using oxygen-enriched air with 35% oxygen in steelmaking can save fuel by 37% at an exhaust temperature of 1370°C; at 1650°C, it can sa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/24B01D67/00B01D53/22C01B13/02C01B21/04
Inventor 张子勇黄键恒
Owner JINAN UNIVERSITY