High-stability MOF (Metal Organic Framework) membrane as well as preparation and gas-liquid separation application thereof

By depositing and thermally growing the MIL-140s seed layer on the porous carrier, a high-stable MOF film is formed, which solves the problem of insufficient separation performance of the existing MOF film under high temperature and high pressure and high humidity atmosphere, and achieves efficient gas-liquid separation under various complex operating conditions.

CN119701652AActive Publication Date: 2025-03-28DALIAN INSTITUTE OF CHEMICAL PHYSICS CHINESE ACADEMY OF SCIENCES
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Patent Information

Application Number
CN202311252645.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2023-09-26
Publication Date
2025-03-28
Estimated Expiration
2043-09-26

AI Technical Summary

Technical Problem

The existing high-stable MOF membranes have problems such as inappropriate pore size and unstable structure in gas-liquid separation applications under high temperature and high pressure and high humidity atmosphere, making it difficult to achieve efficient separation under multiple complex working conditions.

Method used

By depositing a dense MIL-140s seed layer on the porous support and thermally growing in the precursor fluid containing metal source and organic ligand, the gaps between the seed layer are gradually bridged to form a continuous and well-continuous MIL-140s film. This method optimizes the screening channel size to adapt to different separation systems by changing the micromesoscopic structure of the thermodynamic temperature regulation membrane.

Benefits of technology

The ultramicroporous high-stable crystalline MIL-140s film has been prepared, with excellent separation performance and operating stability, and can achieve efficient separation of gas-liquid systems under a variety of complex operating conditions, which has important scientific significance and great application value.

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Abstract

The invention discloses a high-stability MOF (Metal Organic Framework) membrane as well as preparation and gas-liquid separation application thereof. The method comprises the following steps: firstly, depositing a compact MIL-140s seed crystal layer on a porous carrier; then placing the MIL-140s film layer in a precursor liquid containing a metal source and an organic ligand, carrying out thermodynamic growth of a certain period, gradually bridging gaps between crystal seed layers through a coordination reaction of the metal source and the organic ligand, and finally forming a continuous and well-linked MIL-140s film layer; a gas (liquid) separation test shows that the MIL-140s membrane has excellent gas-liquid separation performance. It needs to be particularly pointed out that the micro-mesostructure (such as crystal orientation, film thickness, intergranular defects and the like) of the MIL-140s film can be remarkably regulated, controlled and optimized by changing the thermodynamic growth temperature, and then the size of a screening channel of the MIL-140s film and a corresponding separation system are changed. The research result is expected to realize directional design and controllable optimization of the microstructure and separation performance of the MOF membrane, and the method has a good industrial application prospect.
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