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Preparation method and application of mixed matrix membrane with thermoplastic elastomer as matrix

A thermoplastic elastomer, mixed matrix membrane technology, applied in separation methods, chemical instruments and methods, membrane technology, etc., to achieve excellent separation performance, break through the effect of compromise relationship

Active Publication Date: 2015-06-10
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Afterwards, the study found that ethanol / water (70 / 30wt%) mixed solvent can dissolve Pebax1657 well. The advantage of this solvent is that the casting solution is stable at room temperature, but the dissolution temperature still needs to be 80°C

Method used

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  • Preparation method and application of mixed matrix membrane with thermoplastic elastomer as matrix
  • Preparation method and application of mixed matrix membrane with thermoplastic elastomer as matrix
  • Preparation method and application of mixed matrix membrane with thermoplastic elastomer as matrix

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Weigh a certain amount of Pebax particles and add them to acetic acid, stir at ~50°C for 6 hours to prepare a uniform and transparent 5wt% Pebax solution, let it stand overnight for degassing, then cast the solution onto a PTFE plate, and evaporate the solvent at room temperature After the film is formed, peel it off and put it in an oven at 60°C for at least 24 hours to remove the solvent, then transfer the film to a vacuum oven at 70°C to dry for at least 48 hours, continue to remove the residual solvent, and finally obtain a pure Pebax film, the structure of which is shown in figure 2 .

[0042] Test the gas permeability of the pure Pebax membrane. See Table 1 for the test results at 35°C and an inlet pressure of 0.3MPa.

[0043] Table 1 Gas permeation properties of pure Pebax membranes

[0044]

Embodiment 2

[0046] Prepare a Pebax acetic acid solution with a certain concentration (≤5wt%) as described in Example 1, add SAPO-34 with 30% polymer mass, stir for pre-dispersion and ultrasonication for 2 hours, then continue to stir for at least 2 hours, and then cast the mixed solution to On the PTFE plate, the mixed solution was ultrasonicated for 10 minutes before casting, and the solvent was evaporated at room temperature. After the film was formed, it was peeled off and placed in a 60°C oven for at least 24 hours to remove the solvent, and then the film was transferred to a 70°C vacuum oven for drying. At least 48h, continue to remove the residual solvent to obtain a Pebax / SAPO-34 (10 / 3) mixed matrix membrane.

[0047] The gas permeability of the Pebax / SAPO-34 (10 / 3) mixed matrix membrane was tested. The test results at 35°C and an inlet pressure of 0.3MPa are shown in Table 2.

[0048] Table 2 Pebax / SAPO-34 (10 / 3) gas permeability properties of mixed matrix membranes

[0049]

Embodiment 3

[0051] Prepare a Pebax acetic acid solution with a certain concentration (≤5wt%) as described in Example 1, add SAPO-34 with 50% polymer mass, stir for pre-dispersion and ultrasonication for 2 hours, then continue stirring for at least 2 hours, and then cast the mixed solution to On the PTFE plate, the mixed solution was ultrasonicated for 10 minutes before casting, and the solvent was evaporated at room temperature. After the film was formed, it was peeled off and placed in a 60°C oven for at least 24 hours to remove the solvent, and then the film was transferred to a 70°C vacuum oven for drying. At least 48h, continue to remove the residual solvent to obtain a Pebax / SAPO-34 (10 / 5) mixed matrix membrane.

[0052] The gas permeability of the Pebax / SAPO-34 (10 / 5) mixed matrix membrane was tested, and the test results at 35°C and an inlet pressure of 0.3 MPa are shown in Table 3.

[0053] Table 3 Gas permeability of Pebax / SAPO-34(10 / 5) mixed matrix membrane

[0054]

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Abstract

The invention relates to a preparation method and application of a mixed matrix membrane with a thermoplastic elastomer as the matrix. An unconventional solvent (acid) is employed to prepare a casting solution, and casting is carried out to prepare the mixed matrix membrane. When the molecular sieve content reaches certain degree, a layered structure similar to a composite membrane is formed, under the circumstance of substantial increase of the permeation flux, the selectivity remains unchanged, and the compromise relationship between traditional permeability / selectivity can be overcome. The method has a simple process and is convenient, and the obtained membrane can be used for gas separation, especially CO2 / light gas (N2, CH4, H2, O2) separation.

Description

technical field [0001] The invention belongs to the technical field of gas separation membranes, and in particular relates to a preparation method and application of a mixed matrix membrane with a thermoplastic elastomer as a matrix. Background technique [0002] At present, with the increasing global impact of the greenhouse effect, CO 2 It has become one of the focuses of public attention. reduce CO 2 There are two ways of emission, one is CO 2 capture and storage, and the second is to use CO 2 As a raw material, it is converted into downstream products such as dimethyl ether. Membrane separation method is a new type of CO 2 capture technology. Membrane separation method has been applied in practice, such as CO 2 / CH 4 separation, but generally speaking, the membrane separation method is still in the development stage, CO 2 with other light gases (such as H 2 , N 2 ) is still limited. The key factor restricting its development is high CO 2 Research and develop...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/80B01D71/56B01D71/02B01D71/54B01D67/00B01D53/22
CPCY02C20/40
Inventor 任吉中赵丹李晖邓麦村
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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