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Gas separation membrane

A gas separation membrane and gas separation technology, applied in separation methods, semi-permeable membrane separation, dispersed particle separation, etc., can solve problems such as gas performance degradation, and achieve the effect of high oxygen permeation rate and high oxygen and nitrogen selectivity

Active Publication Date: 2012-09-26
ASAHI KASEI KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the film thickness is increased in order to improve the mechanical strength of the film, the gas performance will decrease
Therefore, there are difficulties in constituting a practical separation membrane module

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0117] Hereinafter, the present invention will be described more specifically using examples and the like, but the present invention is not limited by these examples and the like. Furthermore, the test methods and processing methods for the properties given in Examples and Comparative Examples are as follows.

[0118] (1) Observation conditions of scanning electron microscope (SEM)

[0119] Scanning electron microscope (SEM) observation was performed under the following conditions.

[0120] Sample: Cut the microporous membrane into an appropriate size, fix it on the sample stage, and apply Os with about 6nm as a sample for microscopic examination.

[0121] Device: HITACHI S-4700

[0122] Acceleration voltage: 1kV

[0123] MODE: Ultra High Resolution

[0124] Detector: Upper

[0125] (2) Surface structure of microporous membrane

[0126] According to the condition of (1), the surface structure was determined by scanning electron microscope (SEM) observation.

[0127] (3)...

reference example 1-2

[0193] 95 parts by weight of high-density polyethylene (viscosity average molecular weight: 280,000), 5 parts by weight of polypropylene (viscosity average molecular weight: 250,000), and 0.3 parts by weight of antioxidant were mixed. This mixture was fed into a twin-screw extruder through a feeder. Further, 100 parts by weight of liquid paraffin (dynamic viscosity at 37.78°C: 75.9cSt) was injected into the extruder by side feeding, and melt kneading was performed at 200°C. After the obtained polymer gel was extruded from the T-die provided at the front end of the extruder, it was immediately cooled and solidified with a casting roll cooled to 25° C. to form a film with a thickness of 1.3 mm.

[0194] This sheet was simultaneously stretched to 7×7 times at 120° C. with a biaxial stretcher. Then, this stretched sheet was immersed in methyl ethyl ketone, and the liquid paraffin was removed by extraction, followed by drying to obtain a microporous membrane. Further, it was heat...

reference example 1-3

[0196] 7 parts by weight of ultra-high molecular weight polyethylene (viscosity-average molecular weight: 2 million), 28 parts by weight of high-density polyethylene (viscosity-average molecular weight: 280,000) and 0.3 parts by weight of antioxidant were mixed. This mixture was fed into a twin-screw extruder through a feeder. Further, 65 parts by weight of liquid paraffin (dynamic viscosity at 37.78° C.: 75.9 cSt) relative to the above mixture was injected into the extruder by side feeding, and melt kneading was performed at 200° C. After the obtained polymer gel was extruded from the T-die installed at the front end of the extruder, it was immediately cooled and solidified with a casting roll cooled to 25° C. to form a film into a sheet with a thickness of 1.2 mm.

[0197] The sheet was simultaneously stretched to 7×7 times by a biaxial stretcher at 120° C., and then the stretched sheet was immersed in methyl ethyl ketone to remove liquid paraffin by extraction, and then dri...

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Abstract

Disclosed is a gas separation membrane comprising a polymeric microporous membrane and a gas-separating thin membrane provided on at least one surface and / or in the inside of the polymeric microporous membrane. The polymeric microporous membrane is produced by wet phase separation method, has a porosity of 20 to 80% inclusive, an average pore size of 1 to 100 nm inclusive and a piercing strength of 2 to 50 N at 100 DEG C, and is composed mainly of polyolefin. The gas-separating thin membrane has an average thickness of not less than 0.01 [mu]m and less than 0.4 [mu]m and is composed mainly ofa fluorine-containing gas-separating resin. The gas separation membrane has an oxygen-nitrogen separation factor of 1.4 or greater.

Description

technical field [0001] The present invention relates to a gas separation membrane having excellent gas separation performance. Background technique [0002] Compared with other gas separation methods, the gas separation method using a membrane has high energy efficiency and a simple structure of the device, so it is applied to the separation of various gases. [0003] The most common form of a gas separation membrane is a form in which a thin film of a gas-separating resin is formed on the surface of a porous support membrane. This form is effective in imparting a certain degree of strength to the membrane and having a large amount of gas permeation. As such a porous support membrane, for example, in Patent Document 1, a membrane having a structure of an ultrafiltration membrane is used. [0004] However, since the polyorganosiloxane-based resin is used in the film of Patent Document 1, there is a problem in gas permeation rate. [0005] In addition, among gas separation ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/12B01D53/22B01D69/10B01D71/26B01D71/32B01D71/36
CPCY10S55/05B01D69/12B01D69/02B01D71/44B01D2325/24B01D71/32B01D71/26B01D53/228B01D2325/20B01D53/22B01D71/36
Inventor 杉山圣长谷川卓也近藤孝彦真杉英俊野崎贵司
Owner ASAHI KASEI KK
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