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A polymer-based blend film, its preparation method and application

A technology of polymer and blended membranes, applied in separation methods, chemical instruments and methods, membrane technology, etc., can solve the problems of limited application range of polymer gas separation membranes, difficulty in achieving high permeability coefficient and high selectivity at the same time, etc. Achieve the effect of improving carbon dioxide separation performance, simple and easy method, and high thermal stability

Active Publication Date: 2021-12-07
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the "trade-off" relationship between permeability coefficient and selectivity in the intrinsic gas separation performance of polymer membrane materials, it is difficult to achieve high permeability coefficient and high selectivity at the same time, and the application range of polymer gas separation membranes is limited.

Method used

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  • A polymer-based blend film, its preparation method and application
  • A polymer-based blend film, its preparation method and application
  • A polymer-based blend film, its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0086] Weigh 0.8g of Pebax particles into 20mL ethanol solvent, heat to 50°C and stir to form a uniform and transparent Pebax solution; then, add 0.2g of acetyl tributyl citrate (ATBC) to the Pebax solution, and continue to stir evenly ; Finally, the Pebax / ATBC (20) blend was cast onto a PTFE plate, and after the solvent was volatilized to form a film, it was placed in a vacuum oven and dried at 30°C for 1 day; the dried Pebax / ATBC (20) film was placed on the into the desiccator, and finally test the gas separation performance of the membrane material, and the test results are shown in Table 5.

[0087] image 3 SEM image of the section of the Pebax / ATBC(20) blend film: due to the increase in the flexibility of the polymer chain due to the addition of ATBC, the section of the Pebax / ATBC(20) blend film has a corrugated structure. Figure 4 is the thermogravimetric graph of ATBC; Figure 5 It is the thermogravimetric curve of Pebax / ATBC(20) blend film: the mass loss of the fir...

Embodiment 2

[0091] Weigh 0.5g of Pebax particles into 20mL ethanol solvent, heat to 50°C and stir to form a uniform and transparent Pebax solution; then, add 0.5g of acetyl tributyl citrate (ATBC) to the Pebax solution, and continue to stir evenly; finally The Pebax / ATBC(50) blend was cast onto a PTFE plate, and after the solvent evaporated to form a film, it was dried in a vacuum oven for 1 day; the dried Pebax / ATBC(50) blend film was placed in a desiccator Finally, the gas separation performance of the membrane material was tested, and the test results are shown in Table 6. Figure 6 It is the thermogravimetric curve of the Pebax / ATBC(50) blend film: the thermal stability test shows that the mass loss of the first stage of the blend film is ATBC; the initial mass temperature of ATBC in the blend film is above 200°C, The onset temperature of mass loss is higher than that of pure ATBC, indicating that Pebax and ATBC in the blend film have good compatibility and high thermal stability.

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Embodiment 3

[0095] Weigh 1.6g of TPU particles and add them to 40mL tetrahydrofuran solvent, heat to 40°C and stir to form a uniform and transparent polyurethane solution; then, add 0.4g triethyl citrate (TEC) to the polyurethane solution and continue to stir evenly; The mixed solution was cast onto a PTFE plate, and after the solvent evaporated to form a film, it was placed in a vacuum drying oven at 30°C and dried for 1 day; the dried TPU / TEC (20) film was placed in a desiccator, and finally the film material was tested. Gas separation performance, the test results are shown in Table 7. Figure 7 is the thermogravimetric curve of TEC; Figure 8 It is the thermogravimetric curve of TPU / TEC (20) blend film: the mass loss of the first stage of the blend film is TEC; the initial mass temperature of TEC in the blend film is above 170°C, which is higher than the mass of pure TEC Loss of onset temperature, TPU and TEC in the blend film have good compatibility and good thermal stability.

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Abstract

The application discloses a polymer-based blend film, comprising a polymer matrix and a blending agent; the polymer matrix includes at least one of thermoplastic polymers; the blending agent includes citric acid ester, citric acid derivative at least one of esters. with high CO 2 Polymer-based blended membrane with separation performance and high thermal stability; by adding a blending agent, the structure of the polymer membrane material is modified to increase the CO of the polymer membrane 2 Affinity to improve the CO of polymer-based blend membrane materials 2 separation performance.

Description

technical field [0001] The invention relates to gas separation membrane technology, in particular to a polymer-based blend membrane with high carbon dioxide separation performance and thermal stability. Background technique [0002] With the development of industry, the separation process has become an indispensable part of the chemical process. Among them, gas separation is mainly used in the enrichment, recovery and purification of gases. Compared with traditional gas separation methods such as absorption, adsorption, and rectification, membrane separation methods have the advantages of less energy consumption, small footprint, and low cost. Therefore, membrane separation methods are expected to replace some traditional gas separation methods. [0003] Polymer gas separation membranes can be applied to H 2 (H 2 / N 2 、H 2 / CH 4 、H 2 / CO) recovery, separation, N 2 (O 2 / N 2 ) enrichment, natural gas purification (CO 2 / CH 4 、H 2 S / CH 4 、He / CH 4 ), steam (C 3 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/82B01D69/02B01D67/00B01D53/22
CPCB01D53/228B01D67/0002B01D69/02B01D71/82B01D2257/504Y02C20/40
Inventor 任吉中伍勇东赵丹邓麦村
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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