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Asahi chemical ind

A gas separation membrane and post-analysis technology, applied in gas treatment, separation methods, semi-permeable membrane separation, etc., to achieve high separation performance and high transmission rate

Inactive Publication Date: 2018-04-17
ASAHI KASEI KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] It is generally considered that it is difficult to reduce the thickness of the gas separation membrane without causing defects on the gas separation membrane

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0146] 4 g of chitosan was added to a plastic bottle containing 2 g of acetic acid and 94 g of distilled water and stirred overnight to dissolve it. After dissolution, the obtained aqueous solution was pressure-filtered with a filter having a pore diameter of 5 μm to remove insoluble impurities. The filtered aqueous solution was allowed to stand for 24 hours to defoam. Thereafter, the aqueous solution was spread on a glass plate, and the coating film thickness was adjusted using a doctor blade to control the coating thickness to 1,250 μm. For the obtained coating film, it was dried at 80°C for 3 hours, then immersed in a 0.8M sodium hydroxide solution (solvent is a mixed solvent of ethanol:water=80:20 (volume ratio)) for 3 days, and then placed in Soak in distilled water for 24 hours. Thereafter, it was immersed in a 7M silver nitrate aqueous solution for 72 hours, thereby obtaining a gas separation membrane containing silver atoms. In this example, no drying was performed af...

Embodiment 2～4 and comparative example 1

[0152] As in Example 1 above, the gas separation membrane was produced by the same method as in Example 1, except that the temperature and time during the drying treatment after adjusting the thickness of the coating film with a doctor blade were respectively set as described in Table 1. , and evaluate it.

[0153] The results are listed in Table 1.

Embodiment 5

[0158] In the solution prepared by stirring a mixture of 55.2 parts by mass of ethylenediamine (anhydrous) and 44.8 parts by mass of potassium thiocyanate under nitrogen, add cellulose powder equivalent to 4 mass%, and stir at 60°C to make it Dissolved to obtain a solution. The obtained solution was pressure-filtered with a filter with a pore size of 5 μm to remove insoluble impurities, and then left to stand for 24 hours for defoaming. Thereafter, the solution was spread on a glass plate, and the coating thickness was adjusted using a doctor blade whose coating thickness was controlled at 1,250 μm. About the obtained coating film, it left still at room temperature for 72 hours, the solvent was removed, and the glass plate in which the film was formed was obtained. Then, the glass plate was immersed in a mixed solvent of ethanol:water=80:20 (volume ratio) for 3 days, and further immersed in distilled water for 24 hours, thereby peeling off the film from the glass plate.

[0...

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Abstract

Provided is a gas separation membrane containing polysaccharides and being characterized by having a crystallinity of 17% or lower, the crystallinity being represented by equation (1) below: (1) Crystallinity (%) = [Ic / (Ic+Ia)]*100 (In equation (1), Ic is the sum of the integrals of the scattering intensities of crystalline peaks obtained from X-ray diffraction analysis of the gas separation membrane, and Ia is the sum of the integrals of the scattering intensities of the amorphous halo).

Description

technical field [0001] The present invention relates to carbon dioxide (CO 2 ) and olefin gas separation membranes with excellent separation performance. Background technique [0002] Gas separation and concentration using a gas separation membrane is a method with excellent energy efficiency and high safety compared with distillation methods, high-pressure adsorption methods, and the like. As a pioneering example thereof, for example, the separation of hydrogen in an ammonia production process and the like can be cited. Recently, methods for removing and recovering carbon dioxide, which is a greenhouse gas, from synthesis gas, natural gas, etc., using gas separation membranes have also been actively studied (Patent Documents 1, 2, 3, etc.). [0003] A general form of a gas separation membrane has a structure in which a thin film layer having gas separation capability is disposed on the surface of a porous support. This form imparts a certain degree of strength to the mem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/08B01D69/02
CPCB01D53/228B01D67/0088B01D71/10B01D2325/20B01D2257/504B01D2257/702B01D69/02Y02C20/40B01D2323/081B01D2323/21811B01D71/08B01D69/1214
Inventor 美河正人栗下泰孝
Owner ASAHI KASEI KK
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