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CN-121972016-A - Gas separation membrane and preparation method and application thereof

CN121972016ACN 121972016 ACN121972016 ACN 121972016ACN-121972016-A

Abstract

The invention relates to a gas separation membrane, a preparation method and application thereof, and relates to the technical field of gas separation membranes, wherein the gas separation membrane comprises a modified polysulfone polymer membrane and an MOF layer positioned on at least part of the surface of the modified polysulfone polymer membrane, the modified polysulfone polymer membrane is obtained by sequentially carrying out oxygen-enriched microwave plasma physical modification treatment and chitosan chemical modification treatment on the polysulfone polymer membrane, and the deacetylation degree of chitosan is 70% -85%. The invention mainly carries out physical-chemical combined modification on the polysulfone high molecular membrane by using an oxygen-enriched microwave plasma technology and chitosan with specific deacetylation degree, and composites the polysulfone high molecular membrane with a metal organic framework MOF layer to form the gas separation membrane with a multi-layer structure, thereby obviously improving the separation selectivity of the gas separation membrane for mixed gases such as propylene/propane and the like, and having wide industrial application prospect.

Inventors

  • SHI YUQI

Assignees

  • 北京潜锋科技有限公司

Dates

Publication Date
20260505
Application Date
20260302

Claims (10)

  1. 1. The gas separation membrane is characterized by comprising a modified polysulfone polymer membrane and an MOF layer positioned on at least part of the surface of the modified polysulfone polymer membrane; The modified polysulfone polymer membrane is obtained by sequentially carrying out oxygen-enriched microwave plasma physical modification treatment and chitosan chemical modification treatment on the polysulfone polymer membrane, and the deacetylation degree of the chitosan is 70% -85%.
  2. 2. The gas separation membrane of claim 1, wherein the polysulfone-based polymeric membrane comprises at least one of a polysulfone ultrafiltration membrane and a polyethersulfone ultrafiltration membrane.
  3. 3. The gas separation membrane of claim 1, wherein the material of the MOF layer comprises at least one of ZIF-8, ZIF-67, and ZIF-90.
  4. 4. The gas separation membrane of claim 1, wherein the chitosan has a degree of deacetylation of 80%.
  5. 5. A method for producing a gas separation membrane according to any one of claims 1 to 4, comprising the steps of: Carrying out oxygen-enriched microwave plasma treatment on the polysulfone polymer membrane to obtain a first polysulfone polymer membrane; spin-coating a chitosan solution on the first polysulfone high polymer membrane, and then performing heat treatment to obtain a modified polysulfone high polymer membrane; And (3) placing the modified polysulfone polymer membrane into MOF synthetic solution for soaking treatment, and drying to obtain the gas separation membrane.
  6. 6. The method for preparing a gas separation membrane according to claim 5, wherein the operating condition parameters of the oxygen-enriched microwave plasma treatment comprise that the operating medium is a mixed gas consisting of oxygen and argon in a volume ratio of (8-12): 1, the microwave power is 300-400 w, and the treatment time is 60-90 s.
  7. 7. The method for producing a gas separation membrane according to claim 5, wherein the step of spin-coating a chitosan solution on the first polysulfone polymer membrane and then performing a heat treatment to obtain a modified polysulfone polymer membrane comprises the steps of: Dissolving chitosan in an acetic acid aqueous solution to obtain a chitosan solution with the mass fraction of 2% -3%; And spin-coating the chitosan solution on the first polysulfone polymer membrane under the conditions of spin-coating rotating speed of 800-1200 rpm and spin-coating time of 50-70 s, and then performing heat treatment for 1-2 h at the temperature of 80-90 ℃ to obtain the modified polysulfone polymer membrane.
  8. 8. The method for producing a gas separation membrane according to claim 5, wherein the step of immersing the modified polysulfone polymer film in a MOF synthesis solution and drying the immersed film to obtain the gas separation membrane comprises the steps of: Preparing the MOF synthesis solution according to the chemical composition of the MOF material; and placing the modified polysulfone polymer membrane in the MOF synthesis solution, carrying out soaking treatment for 10-60 min at 25-45 ℃ and 0.8-1.2b ar, taking out the membrane, and drying to obtain the gas separation membrane.
  9. 9. Use of a gas separation membrane according to any one of claims 1 to 4 or a gas separation membrane produced by a process for producing a gas separation membrane according to any one of claims 5 to 8 in mixed gas separation.
  10. 10. The use according to claim 9, wherein the mixed gas comprises a mixed gas consisting of propylene and propane.

Description

Gas separation membrane and preparation method and application thereof Technical Field The invention relates to the technical field of gas separation membranes, in particular to a gas separation membrane, a preparation method and application thereof. Background In modern industrial production and daily life, gas separation is a crucial technical link. Many industries, such as chemical industry, energy sources, environmental protection and the like, rely on high-efficiency gas separation technology to realize separation, purification and recycling of different gas components. Taking the chemical field as an example, in the production process of propylene and propane, the propylene and the propane often exist in the form of mixed gas, and propylene is taken as an important chemical raw material, and the purity of the propylene has a decisive influence on the quality and production efficiency of subsequent products. In recent years, gas separation membrane technology has been widely focused and studied in recent years as an emerging gas separation method, by virtue of its remarkable advantages of low energy consumption, simple operation, compact equipment, environmental friendliness, and the like. The core of the gas separation membrane is the membrane material, and the performance of the membrane material directly determines the separation efficiency and selectivity of the gas separation membrane. At present, common gas separation membrane materials mainly comprise polymer membranes, inorganic membranes, composite membranes and the like. However, the gas separation performance of the existing gas separation membrane material is still to be improved, and the gas permeability and the selectivity of the existing gas separation membrane material have a mutually restricted relationship, so that the application scene with high requirements on the separation selectivity of mixed gas such as propylene/propane in industry is difficult to meet. Disclosure of Invention In order to solve the problems, the invention provides a gas separation membrane, and a preparation method and application thereof. In a first aspect, the present invention provides a gas separation membrane, including a modified polysulfone polymer membrane and a MOF layer located on at least a portion of the surface of the modified polysulfone polymer membrane; The modified polysulfone polymer membrane is obtained by sequentially carrying out oxygen-enriched microwave plasma physical modification treatment and chitosan chemical modification treatment on the polysulfone polymer membrane, and the deacetylation degree of the chitosan is 70% -85%. Further, the polysulfone polymer membrane comprises at least one of a polysulfone ultrafiltration membrane and a polyethersulfone ultrafiltration membrane. Further, the MOF layer material comprises at least one of ZIF-8, ZIF-67 and ZIF-90. Further, the chitosan has a degree of deacetylation of 80%. In a second aspect, the present invention provides a method for preparing a gas separation membrane according to the first aspect, comprising the steps of: Carrying out oxygen-enriched microwave plasma treatment on the polysulfone polymer membrane to obtain a first polysulfone polymer membrane; spin-coating a chitosan solution on the first polysulfone high polymer membrane, and then performing heat treatment to obtain a modified polysulfone high polymer membrane; And (3) placing the modified polysulfone polymer membrane into MOF synthetic solution for soaking treatment, and drying to obtain the gas separation membrane. Further, the working condition parameters of the oxygen-enriched microwave plasma treatment comprise that a working medium is mixed gas composed of oxygen and argon with the volume ratio of (8-12): 1, the microwave power is 300-400W, and the treatment time is 60-90 s. Further, the step of spin-coating the chitosan solution on the first polysulfone polymer film and then performing heat treatment to obtain the modified polysulfone polymer film comprises the following steps: Dissolving chitosan in an acetic acid aqueous solution to obtain a chitosan solution with the mass fraction of 2% -3%; And spin-coating the chitosan solution on the first polysulfone polymer membrane under the conditions of spin-coating rotating speed of 800-1200 rpm and spin-coating time of 50-70 s, and then performing heat treatment for 1-2 h at the temperature of 80-90 ℃ to obtain the modified polysulfone polymer membrane. Further, the step of immersing the modified polysulfone polymer membrane in MOF synthetic solution and drying to obtain the gas separation membrane comprises the following steps: Preparing the MOF synthesis solution according to the chemical composition of the MOF material; and placing the modified polysulfone polymer membrane in the MOF synthesis solution, carrying out soaking treatment for 10-60 min at 25-45 ℃ and 0.8-1.2b ar, taking out the membrane, and drying to obtain the gas separation membrane. In a third as