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Preparation method of MIL-100 (Fe)/PDMS film

A technology of bottom membrane and casting liquid, applied in separation methods, chemical instruments and methods, membranes, etc., can solve the problem of low separation factor of organic gas, and achieve the effect of improving separation factor, good separation effect and good anti-swelling performance.

Active Publication Date: 2022-03-08
CHINA UNIV OF MINING & TECH (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The currently used silicone rubber materials (polydimethylsiloxane, etc.) have a low separation factor for organic gases, and there is still a lot of air in the permeated gas, which needs further treatment

Method used

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  • Preparation method of MIL-100 (Fe)/PDMS film
  • Preparation method of MIL-100 (Fe)/PDMS film
  • Preparation method of MIL-100 (Fe)/PDMS film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Add MIL-100(Fe) to 20 grams of n-heptane to form a suspension with a mass concentration of 1%. Take 2 grams of silicone oil with a viscosity of 20000mPa·s and dissolve it in the above suspension, make it fully mixed and dispersed, and then Add 0.2 gram of vinyltrimethoxysilane and 0.06 gram of dibutyltin dilaurate, stir well to obtain the casting solution; use the polyvinylidene fluoride ultrafiltration membrane as the base film, and apply the obtained casting solution evenly to the polyvinylidene fluoride ultrafiltration membrane. on vinyl fluoride ultrafiltration membranes. After standing at room temperature for 24 hours, it was heat-treated in an oven at 60° C. for 4 hours to make it fully crosslinked, and a MIL-100(Fe) filled PDMS gas permeable composite membrane was prepared.

[0042]The prepared composite membrane was used to test the separation performance of mixed gas. When the volume fraction of propane in the mixed gas was 24%, the inlet temperature was 25°C, ...

Embodiment 2

[0044] Add 20 grams of toluene to MIL-100(Fe) to form a suspension with a mass concentration of 5%, and dissolve 2 grams of silicone oil with a viscosity of 100,000 mPa·s into the above suspension, make it fully mixed and dispersed, and then add 0.3 gram of vinyltrimethoxysilane and 0.03 gram of dibutyltin dilaurate, stir well to obtain the casting solution; take the polyimide ultrafiltration membrane as the base film, and evenly coat the obtained casting solution on the polyimide on the ultrafiltration membrane. After standing at room temperature for 24 hours, heat treatment in an oven at 120° C. for 2 hours to make it fully cross-linked to prepare a MIL-100(Fe) filled PDMS gas permeable composite membrane.

[0045] The prepared composite membrane was used to test the separation performance of mixed gas. When the volume fraction of propane in the mixed gas was 24%, the inlet temperature was 25°C, and the inlet pressure was 0.20MPa, the permeation flux was 137.0L·m-2· h-1, th...

Embodiment 3

[0047] Add 20 grams of n-hexane to MIL-100(Fe) to form a suspension with a mass concentration of 10%. Take 2 grams of silicone oil with a viscosity of 5000mPa·s and dissolve it in the above suspension, make it fully mixed and dispersed, and then add 0.15 gram of vinyltrimethoxysilane and 0.1 gram of dibutyltin dilaurate, and stir to obtain a casting solution; the polyetherimide ultrafiltration membrane is used as a base film, and the obtained casting solution is evenly coated on polyetheramide imine ultrafiltration membrane. After standing at room temperature for 24 hours, it was heated in an oven at 60°C for 10 hours to make it fully cross-linked, and a MIL-100(Fe) filled PDMS gas permeable composite membrane was prepared.

[0048] The prepared composite membrane was used to test the separation performance of mixed gas. When the volume fraction of propane in the mixed gas was 24%, the inlet temperature was 25°C, and the inlet pressure was 0.20MPa, the permeation flux was 112....

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Abstract

The invention discloses a preparation method of an MIL-100 (Fe) / PDMS (polydimethylsiloxane) membrane, which comprises the following steps: preparing silicone oil PDMS, MIL-100 (Fe), a cross-linking agent, a catalyst and a solvent into a membrane casting solution, coating the membrane casting solution on a solvent-resistant ultrafiltration membrane, and heating after the solvent is volatilized to further crosslink and cure the membrane casting solution, thereby obtaining the MIL-100 (Fe) / PDMS organic gas permeable membrane. According to the prepared permeable membrane, MIL-100 (Fe) is directly added, the separation performance of the membrane can be greatly enhanced, and when the permeable membrane is used for recovering low-molecular-weight hydrocarbons from air and organic mixed gas, the separation factor is greatly increased.

Description

technical field [0001] The invention relates to the technical field of gas permeable composite membranes, in particular to a method for preparing a MIL-100(Fe) / PDMS composite membrane suitable for recovery of low molecular weight organic solvents. Background technique [0002] The main source of volatile organic compounds (VOCs) is in the artificial production process, including petroleum refining, oil and gas storage and transportation, chemical production, coatings and many other industries. Most of the current treatment methods of VOCs are destructive methods, which cause a huge waste of resources and environmental pollution. Recycling VOCs has good environmental and economic benefits and prospects. [0003] The current industrial VOCs recovery methods mainly include adsorption, absorption, condensation and other methods. Gas membrane separation is a membrane separation process that uses gas pressure as the driving force to separate specific gases from mixed gases. Com...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/82B01D71/70B01D69/12B01D69/02B01D67/00B01D53/22
CPCB01D71/82B01D71/70B01D69/125B01D69/02B01D67/0011B01D67/0013B01D53/228B01D2325/12
Inventor 蔡卫滨王泽众陈潇涵谢将煜
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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