Polymer-based blended membrane and preparation method and application thereof

A technology of polymer and blended membranes, which is applied in separation methods, chemical instruments and methods, membrane technology, etc., can solve the problems of difficult simultaneous realization of high permeability coefficient and high selectivity, and the limitation of the application range of polymer gas separation membranes. Achieve high CO2 separation performance, improve CO2 separation performance, and the effect of simple and easy method

Active Publication Date: 2020-06-19
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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  • Polymer-based blended membrane and preparation method and application thereof
  • Polymer-based blended membrane and preparation method and application thereof
  • Polymer-based blended membrane and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0085] 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.

[0086] image 3 It is the SEM image of the section of the Pebax / ATBC (20) blend film: due to the addition of ATBC, the flexibility of the polymer chain is increased, and the section of the Pebax / ATBC (20) blend film has a corrugated structure. Figure 4 is the thermogravimetric graph of ATBC; Figure 5 is the thermogravimetric curve of the Pebax / ATBC(20) blend film: the mass loss of...

Embodiment 2

[0090] Weigh 0.5g of Pebax particles and add them to 20mL of 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 , and 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 the...

Embodiment 3

[0094] 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 invention discloses a polymer-based blended membrane. The polymer-based blended membrane comprises a polymer matrix and a blending agent, the polymer matrix comprises at least one of thermoplasticpolymers, and the blending agent comprises at least one of citric acid ester and citric acid derivative ester. The polymer-based blended membrane has high CO2 separation performances and high thermalstability. By adding the blending agent, the structure of the polymer membrane material is modified, the CO2 affinity of the polymer membrane is improved, and the CO2 separation performance of the polymer-based blended membrane material is improved.

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 has the advantages of less energy consumption, small footprint, and low cost. Therefore, membrane separation is 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 h 6 / N 2 、C 2 h...

Claims

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Application Information

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Patent Type & Authority Applications(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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