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A method for improving the gas separation performance of supported MOF membranes by using polymer coatings

A polymer coating and gas separation technology, applied in the field of membrane separation, can solve the problems of poor stability, poor repeatability, and selectivity decline of MOF membranes

Active Publication Date: 2021-08-20
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to improve the poor stability of existing MOF membranes, poor repeatability, and the flexibility of the MOF material skeleton under high pressure, resulting in a decrease in selectivity, and to provide a method for improving the gas separation performance of supported MOF membranes by using polymer coatings , the method described is a simple and effective method for improving the performance of MOF membranes; using the good film-forming properties, thermal stability and mechanical stability of polymers, a dense polymer coating is formed on the surface of MOF membranes, which can effectively prevent The MOF membrane is protected from damage and can inhibit the skeleton flexibility of the MOF material, thereby improving the separation performance of the MOF membrane

Method used

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  • A method for improving the gas separation performance of supported MOF membranes by using polymer coatings
  • A method for improving the gas separation performance of supported MOF membranes by using polymer coatings
  • A method for improving the gas separation performance of supported MOF membranes by using polymer coatings

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Embodiment 1

[0034] Embodiment 1 surface is coated with the Zn (MIM) of silicone rubber coating 2 The preparation of the film, the preparation steps are as follows:

[0035] Step 1: Zn(MIM) 2 Membrane preparation, using secondary growth method for Zn(MIM) 2 film preparation,

[0036] Zn(MIM) according to the method reported by Pan et al. 2 The membrane is synthesized,

[0037] (1) Carry out pretreatment to porous alumina carrier, adopt 600 # 、1000 # Polish the porous alumina carrier with sandpaper until the surface is smooth, then put the carrier in clean water and ultrasonically clean it for 10 minutes, the ultrasonic frequency is 120KHz, after drying, put it into a muffle furnace at 300°C for calcination for 5 hours, take it out for use,

[0038] (2) Preparation of seed liquid, 1.17g zinc nitrate hexahydrate and 22.7g 2-methylimidazole were dissolved in 88ml deionized water, stirred at room temperature for 5h, centrifuged and washed, then evenly dispersed in methanol solution to ma...

Embodiment 2

[0047] The Co(MIM) that embodiment 2 surface is coated with silicone rubber coating 2 Membrane preparation, prepared as follows,

[0048] Carry out the Co(MIM) that surface is coated with silicone rubber coating according to the preparation method of embodiment 1 2 membrane. Co(MIM) 2 The raw materials for membrane preparation are cobalt nitrate hexahydrate and 2-methylimidazole, and the molar ratio is 1:80. The resulting Co(MIM) 2 The membrane thickness is 2 μm with pore sizes ranging from 0.2 nm to 0.5 nm. Prepare a 40wt.% silicone rubber solution according to the method in Example 1, and the solution is evenly drip-coated on the Co(MIM) 2 The surface of the membrane was dried at 80°C for 3 days to remove the solvent, and the Co(MIM) coated with a silicone rubber coating was obtained. 2 Membrane, in which the thickness of the silicone rubber coating is 40 μm. It has been determined that at 35°C and 0.1MPa, pure Co(MIM) 2 The permeation fluxes of propylene and propane...

Embodiment 3

[0049] Embodiment 3 surface is coated with the Zn (BIM) of silicone rubber coating 2 Membrane preparation, prepared as follows,

[0050] Carry out the Zn(BIM) that the surface is coated with silicone rubber coating according to the preparation method of embodiment 1 2 membrane. Among them, Zn(BIM) 2 The raw materials of the membrane are zinc nitrate hexahydrate and benzimidazole, the molar ratio of which is 1:2, and the obtained Zn(BIM) 2 The thickness of the membrane is 1 μm and the pore size ranges from 0.2 nm to 0.5 nm. Prepare a 10wt.% silicone rubber solution according to the method in Example 1, and apply the solution evenly on the Zn(BIM) by spin coating 2 On the surface of the film, the rotation speed of the spin coater is 1500 rpm, the spin time is 10s, and the Zn(BIM) coated with silicone rubber coating is obtained after drying at 60°C for 1 day. 2 Membranes, in which the thickness of the silicone rubber coating is 0.5 μm. It has been determined that at 35°C an...

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Abstract

The invention provides a method for improving the gas separation performance of a supported MOF membrane by using a polymer coating. A layer of polymer coating is coated on the surface of the MOF membrane, which can repair the defects of the MOF membrane; The material coating can effectively prevent the flexibility of the MOF framework and limit the expansion of its pore size, thereby effectively improving the gas separation performance. In addition, the externally applied polymer coating can significantly improve the hydrothermal stability of the MOF membrane, and the coating also effectively protects the brittleness of the MOF membrane itself. The method for repairing the MOF membrane by using the polymer coating mentioned in the present invention has wide application value in the field of gas separation.

Description

technical field [0001] The invention belongs to the field of membrane separation, and relates to a method for improving the gas separation performance of an MOF membrane by using a polymer coating. Background technique [0002] Compared with traditional separation technologies, gas separation membrane technology is considered to be a new technology for effectively separating mixed gases due to its advantages of high efficiency, energy saving and environmental friendliness. At present, many different types of membranes have been tried for the separation of mixed gases, such as polymer membranes, zeolite membranes, and molecular sieve membranes. However, most of these membranes are limited by certain factors and cannot satisfy high selectivity and high permeability at the same time. [0003] Metal-organic frameworks (MOFs) are a new type of membrane material for gas separation, composed of inorganic metal particles and organic ligands through coordination, and have both the p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/76B01D69/10B01D67/00B01D53/22
CPCB01D53/228B01D67/0079B01D69/105B01D71/76
Inventor 潘宜昌盛露倩杨帆俞健王重庆
Owner NANJING TECH UNIV
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