Mixed matrix membrane as well as preparation method and application of mixed matrix membrane

A mixed-matrix membrane and membrane-forming technology, applied in separation methods, chemical instruments and methods, membrane technology, etc.

Active Publication Date: 2014-12-10
CHNA ENERGY INVESTMENT CORP LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Technologists add inorganic fillers to polymers and expect to obtain MMM membranes with better performance than pure polymer membranes. However, in the past 30 years of research, there are not many MMM membranes with ideal separation effects.

Method used

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  • Mixed matrix membrane as well as preparation method and application of mixed matrix membrane
  • Mixed matrix membrane as well as preparation method and application of mixed matrix membrane
  • Mixed matrix membrane as well as preparation method and application of mixed matrix membrane

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preparation example Construction

[0039] In yet another typical embodiment of the present invention, a method for preparing a mixed matrix membrane is provided. The preparation method includes: step S1, preparing a solution of polyetherimide; step S2, dispersing molecular sieves in polyetherimide In the imine solution, a casting solution is obtained; step S3, using the casting solution to form a film. In this preparation method, the casting liquid can be obtained by dispersing the molecular sieve in the prepared polyetherimide solution, and then the film is prepared. The above-mentioned dispersion process is a physical process without chemical reaction, and the whole preparation process does not require high equipment, which is beneficial to industrialization.

[0040] In the above step S1, different solvents can be selected according to the type of polyetherimide selected for preparation. Commonly used solvents include dimethylacetamide, dimethylformamide, and N-methylpyrrolidone , tetrahydrofuran or dichlor...

Embodiment 1

[0048] Add 0.95g of the powdery intrinsic viscosity after vacuum oven drying to 40ml / g HQDEA-DMMDA new polyetherimide PEI into 50g of dichloromethane solvent, and stir at room temperature (20-30°C) for 8 hours to form a uniform and transparent polymer solution.

[0049] Add 0.05g of SAPO-34 molecular sieve to the polymer solution, stir vigorously for 15min at a low temperature of 4°C at a speed of 1000rpm, ultrasonicate for 2h to form a slightly whitish homogeneous solution, and let it stand for 24 hours for defoaming;

[0050] Pour the defoamed casting solution onto a clean horizontal glass plate, spread the casting solution evenly on the glass plate, keep the temperature of the glass plate at room temperature (20-30°C), and control the air humidity at 30%. The solvent is volatilized to finally form a primary film. Carefully remove the nascent film from the glass plate, put it in a vacuum oven, dry at 60°C for 48h, and then vacuum at 120°C for 24h to further remove the resi...

Embodiment 2

[0052] Add 0.9g of the powdery intrinsic viscosity after vacuum oven drying to 80ml / g HQDEA-DMMDA new polyetherimide PEI into 50g of dichloromethane solvent, stir at room temperature (20-30°C) for 8h, and form a uniform and transparent polymer solution;

[0053] Add 0.1 g of SAPO-34 molecular sieve to the polymer solution, stir vigorously at 10°C for 15 min at a speed of 1500 rpm, ultrasonicate for 2 h to form a slightly whitish homogeneous solution, and then press at - Degassing at 0.06MPa;

[0054] Pour the defoamed casting solution onto a clean horizontal glass plate, spread the casting solution evenly on the glass plate, keep the temperature of the glass plate at room temperature (20-30°C), and control the air room temperature at 20%. The solvent is volatilized to finally form a primary film. Carefully remove the nascent film from the glass plate, put it in a vacuum oven, dry at 60°C for 48h, and then vacuum at 120°C for 24h to further remove the residual solvent to obta...

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Abstract

The invention discloses a mixed matrix membrane as well as a preparation method and application of the mixed matrix membrane. The mixed matrix membrane comprises a base material and packing, wherein the base material is polyetherimide and the packing is a molecular sieve; the polyetherimide is selected from one or more of polyetherimide represented by a formula I shown in the specification, wherein A is described in the specification; Z is described in the specification; R is H, CH3 or OCH3; and B is -O-, -CH2-, -CO-, -SO2- or a formula shown in the specification. The mixed matrix membrane takes polyetherimide as the base material so that a polar ether oxygen group in polyetherimide can be sufficiently utilized so as to improve the selectivity of CO2; meanwhile, the molecular sieve with an interconnection pore structure is used as the packing so that the infiltration capacity and the selectivity of gas can be improved and the gas separation performance is excellent. Therefore, the mixed matrix membrane has high selectivity and good gas permeability.

Description

technical field [0001] The invention relates to the technical field of gas separation membranes, in particular to a mixed matrix membrane, its preparation method and its application. Background technique [0002] Carbon dioxide is a common impurity in natural gas, about 17% of the natural gas in the United States is removed before entering the pipeline. 2 , in order to increase the calorific value of natural gas and avoid a series of problems caused by impurities, such as pipeline and equipment corrosion, pipeline capacity decline, etc., CO must be 2 from CH 4 separated out. Traditional CO 2 Separation methods include low-temperature distillation, adsorption, and absorption, but these methods have their own advantages and disadvantages. Among them, low-temperature distillation requires high energy and the process flow is relatively complicated; the problem encountered by the adsorption method is that the adsorption capacity of the adsorbent is limited and in the separatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/64B01D67/00B01D53/22
Inventor 任吉中张立秋陈茂山郭振东李晖曾吉来张源王秀芬
Owner CHNA ENERGY INVESTMENT CORP LTD
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