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A kind of phosphoric acid-treated tröger`s Base polymer gas separation membrane and its preparation method and application

A gas separation membrane and gas separation technology, applied in separation methods, gas treatment, semi-permeable membrane separation, etc., can solve the problems of low separation selectivity and low separation efficiency, and achieve wide source of raw materials, high selectivity and excellent performance Effect

Active Publication Date: 2021-08-20
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the deficiencies of the prior art and solve the technical problems of low separation selectivity and low separation efficiency of existing separation membranes for light gases such as hydrogen and carbon dioxide, the present invention provides a polymer gas separation membrane and its preparation method and application

Method used

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  • A kind of phosphoric acid-treated tröger`s Base polymer gas separation membrane and its preparation method and application
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  • A kind of phosphoric acid-treated tröger`s Base polymer gas separation membrane and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Example 1: D- Preparation of base polymer membrane:

[0038] (1) Synthesis of polymer: under ice bath, add 10 g (47.169 mmol) of 4,4'-diamino-3,3'-dimethylbiphenyl, and dimethanol to a three-necked flask with mechanical stirring 21ml (235.8mmol) of formaldehyde, fully dissolved, slowly added 80ml of trifluoroacetic acid dropwise to it, stirred at room temperature for 96 hours, then slowly poured the solution into ammonia water, filtered, washed with methanol 3-5 times, dried,

[0039]

[0040] (2)D- Preparation of base polymer film: 0.3g D- Base was dissolved in 3ml of chloroform, filtered, the obtained polymer solution was slowly poured on a clean glass plate, and allowed to flow naturally, and the solvent was slowly evaporated at room temperature to form a film. Soak in methanol for 12 hours, then dry in a vacuum oven at 120°C for 12 hours. A polymer film thickness of approximately 50 μm was obtained.

Embodiment 2

[0041] Example 2: M- Preparation of base polymer membrane:

[0042] (1) Synthesis of polymer: under ice bath, add 10.65 g (47.169 mmol) of 4,4'-diamino-3,3'-dimethyldiphenylmethane, and two 21ml (235.8mmol) of methanol formal, fully dissolved, slowly added dropwise 80ml of trifluoroacetic acid, stirred at room temperature for 96 hours, slowly poured the solution into ammonia water, filtered, washed 3-5 times with methanol, dried,

[0043]

[0044] (2)M- Preparation of base polymer film: 0.3gM- Base was dissolved in 3ml of chloroform, filtered, the obtained polymer solution was slowly poured on a clean glass plate, and allowed to flow naturally, and the solvent was slowly evaporated at room temperature to form a film. Soak in methanol for 12 hours, then dry in a vacuum oven at 120°C for 12 hours. A polymer film thickness of approximately 50 μm was obtained.

Embodiment 3

[0045] Example 3: Trip- Preparation of base polymer membrane:

[0046] (1) Synthesis of polymer: under ice bath, add 13.4g (47.169mmol) of 2,6-triptycenediamine and 21ml (235.8mmol) of dimethylformal to a three-necked flask with mechanical stirring, fully Dissolve, slowly add 80ml of trifluoroacetic acid dropwise therein, after stirring at room temperature for 96 hours, slowly pour the solution into ammonia water, filter, wash with methanol 3-5 times, dry,

[0047]

[0048] (2) Trip- Preparation of base polymer film: 0.3g Trip- Base was dissolved in 3ml of chloroform, filtered, the obtained polymer solution was slowly poured on a clean glass plate, and allowed to flow naturally, and the solvent was slowly evaporated at room temperature to form a film. Soak in methanol for 12 hours, then dry in a vacuum oven at 120°C for 12 hours. A polymer film thickness of approximately 50 μm was obtained.

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Abstract

The invention relates to a preparation method and application of a phosphoric acid-treated Tröger`s Base polymer gas separation membrane, which belongs to the technical field of membrane gas separation and solves the separation selectivity of existing separation membranes for light gases such as hydrogen and carbon dioxide Low, low separation efficiency technical problems. The solution is: First, use the rigid skeleton structure of Tröger`s base to obtain a large free volume and increase the efficiency of gas transmission. After phosphoric acid treatment, use the interaction between N on the main chain and phosphoric acid to maintain phosphoric acid in the polymerization Stability in the material, improve the selectivity of hydrogen to carbon dioxide. The selectivity can be adjusted by changing the acid treatment conditions of the polymer. Experiments have shown that the performance of the treated membrane exceeds the current 2008 Robeson upper limit at room temperature and high temperature.

Description

technical field [0001] The invention belongs to the technical field of membrane gas separation, in particular to a phosphoric acid-treated Preparation method and application of Base polymer gas separation membrane. Background technique [0002] In today's increasingly serious energy crisis, the development of new energy sources has become the most important topic. Hydrogen energy, as a clean, efficient, and environmentally friendly energy source, has received more and more attention. So far, the main route to hydrogen production has been through methane reforming followed by the water-gas shift reaction. The main by-product of this process is carbon dioxide, which must be removed in order for the purified H 2 can be used for further applications. [0003] Compared with traditional separation methods, membrane gas separation technology has the advantages of low energy consumption, simple operation, compact equipment, and easy scale-up. It has good development prospects in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/62B01D69/02B01D67/00B01D53/22
CPCB01D53/228B01D67/0006B01D69/02B01D71/62B01D2256/16B01D2256/22
Inventor 李南文吴垒
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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