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Gas separating membrane and its utilizing method

A gas separation membrane, helium technology

Inactive Publication Date: 2005-05-25
UBE IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, for membranes with an asymmetric structure, when trying to increase the permeable gas permeation rate through such membranes, simply reduce the thickness of the porous layer or increase the porosity of the porous layer to further reduce the permeation rate. The permeation rate was successfully increased by increasing the permeation resistance of the membrane-permeable component of the membrane, however, this was at the expense of the membrane-supporting function performed by the porous layer, i.e., mechanical strength
For this reason, a practical solution having both an improved permeation rate of the permeable gas-permeable membrane and an appropriate level of mechanical strength as an asymmetric hollow fiber membrane practically used in industrial components, that is, a practical level of mechanical strength is obtained. , high-performance gas separation membranes are difficult
[0009] In addition, when gas separation membranes are used for dehumidification or humidification, membranes having poor water resistance and hot water resistance are problematic because such membranes cannot be used stably over a long period of time, and their use is subject to limit

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] In a separable flask, 583.3 g of a solution of polyimide A with a polymer concentration of 12.0 wt % and 250 g of a solution of polyimide B with a polymer concentration of 13.0 wt % were stirred at a temperature of 130 °C for 3 hours to prepare a polyimide blend solution. This blend solution had a polymer concentration of 12.3 wt% and a rotational viscosity of 1500 poise. The polyimide blend solution was used to produce hollow fiber membranes by the aforementioned asymmetric hollow fiber membrane production method. The gas permeability and mechanical properties of this hollow fiber membrane were measured by the aforementioned methods. The results are shown in Table 1.

Embodiment 2

[0065] Using the same mixing method as in Example 1, 400 g of polyimide A solution with a polymer concentration of 12.0 wt % and 400 g of polyimide B solution with a polymer concentration of 13.0 wt % were mixed to prepare a mixed solution. The polymer concentration of this blend solution was 12.5 wt%. This polyimide blend solution was used to produce hollow fiber membranes by the aforementioned asymmetric hollow fiber membrane production method. The gas permeability and mechanical properties of this hollow fiber membrane were measured by the aforementioned methods. The results are shown in Table 1.

Embodiment 3

[0073] Using the same mixing method as in Example 1, 350 g of polyimide C solution with a polymer concentration of 12.0 wt % and 150 g of polyimide B solution with a polymer concentration of 13.0 wt % were mixed to prepare a mixed solution. The polymer concentration of this blend solution was 12.3 wt%. This polyimide blend solution was used to produce hollow fiber membranes by the aforementioned asymmetric hollow fiber membrane production method. The gas permeability and mechanical properties of this hollow fiber membrane were measured by the aforementioned methods. The results are shown in Table 1.

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Abstract

An asymmetric membrane formed using two or more different polymers including at least one polyimide. It is thereby possible to produce a gas separation membrane having a low permeation resistance (high permeation rate) for the porous layer permeable to the gas permeable membrane, which also maintains a practical level of mechanical strength, and excellent water resistance and hot water resistance.

Description

technical field [0001] The present invention relates to a gas separation membrane with an asymmetric structure composed of a surface layer and a porous layer. The resistance to gas permeation increases the gas permeable membrane permeation rate, and the gas separation membrane has at least a practical level of mechanical strength as a hollow fiber gas separation membrane. The present invention further relates to a gas separation membrane having excellent water resistance and hot water resistance. The present invention also relates to a dehumidification method and a humidification method, which are characterized by using the aforementioned gas separation membrane. Background technique [0002] Gas separation membranes are used in various gas separation methods. Most gas separation membranes are produced from glassy polymers with high selectivity. In general, glassy polymers have high selectivity (degree of separation), but have the disadvantage of low gas permeability. Th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/22B01D53/26B01D69/02B01D71/64
CPCB01D53/228B01D53/268B01D69/02B01D71/641B01D71/643
Inventor 中西俊介吉永利宗伊藤健次楠木喜博
Owner UBE IND LTD