Gas separation membrane

A technology of gas separation membranes and divalent organic groups, which is applied in separation methods, semipermeable membrane separations, and dispersed particle separations. It can solve problems such as processability, strength, and separation performance, chemical structure, and chemical structure limitations that are difficult to design. , to achieve the effect of easy preparation of polyimide solution, excellent membrane physical properties and good separation performance

Active Publication Date: 2015-08-05
CENT GLASS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] As previously described, for obtaining 3 ) 2 The diamine compound and tetracarboxylic dianhydride of -based polyimide are limited, and the chemical structure is limited when forming a polyi

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Examples

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Embodiment

[0148] Hereafter, although an Example demonstrates this invention concretely, this invention is not limited to these Examples.

[0149] [Preparation of polyimide film]

[0150] The preparation of a polyimide membrane containing a HFIP group and an alkyl group for a gas separation membrane will be described.

[0151] Add the following HFA-2DMeBD (2.06g, 3.78mmol), 6FDA (1.68g, 3.78mmol), and N,N-dimethylacetamide (14g) to a 200mL three-necked flask equipped with a nitrogen gas introduction tube and a reflux cooler, After stirring at room temperature under a nitrogen atmosphere for 18 hours, pyridine (0.66 g, 8.32 mmol) and acetic anhydride (0.77 g, 7.56 mmol) were added, followed by further stirring at room temperature for 3 hours. The resulting reaction liquid was heated up to 200° C., stirred for further 6 hours, and then cooled to room temperature. A homogeneous N,N-dimethylacetamide solution in which polyimide 1 was dissolved was obtained. The solution was measured by GP...

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Abstract

[Problem] To provide a gas separation membrane which dissolves in an organic solvent, exhibits excellent formability, and exhibits excellent gas-separation performance when used as a gas separation membrane. [Solution] A gas separation membrane having a polyimide structure containing a repeating unit represented by general formula (1) (In the formula, R1 represents a bivalent organic group, and R2 represents a tetravalent organic group.), wherein R1 is a bivalent organic group represented by general formula (2) (In the formula, Raa represents a single bond, a sulfur atom, -SO2-, -CH2-, -C(=O)-, -C(CH3)2-, -C(CH3)(CH2CH3)- or -C(CF3)2-, or a bivalent organic group obtained by separating two arbitrary hydrogen atoms from a C3-12 alicyclic hydrocarbon compound or from a C6-25 aromatic hydrocarbon compound. Rab is a C1-6 alkyl group. ac and ad each independently represent an integer of 0-2. 1≤ac+ad≤4. HFIP represents a -C(CF3)2OH group. The line segments intersecting the wavy lines represent the locations of bonds.)

Description

technical field [0001] The present invention relates to gas separation membranes. Background technique [0002] Gas separation using a gas separation membrane has been attracting attention as a simple technique capable of continuously separating a mixed gas while maintaining a gaseous state without phase change. The separation of gas is a technique of selectively separating the gas according to the type of gas (hereinafter, sometimes referred to as "gas") to permeate through the gas separation membrane, and utilizing the difference in permeation velocity. [0003] Polymers such as cellulose acetate, polysulfone, and polyimide are known as materials for such gas separation membranes. Among them, polyimide is known as a material that has strength suitable for use as a gas separation membrane, is not easily damaged, has excellent heat resistance, and can be used at high temperatures. [0004] There have been many reports on gas separation membranes using polyimide, and the in...

Claims

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Application Information

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IPC IPC(8): B01D71/64B01D71/46B01D71/52B01D71/68C08G59/62C08G73/10
CPCC08G73/1067B01D67/0016C08L79/08B01D65/108B01D53/228C08G73/1042C08G73/1039B01D71/64B01D63/023B01D71/027B01D67/0018C08L63/00
Inventor 山中一广须田健资鱼山大树
Owner CENT GLASS CO LTD
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