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Preparation method for PDMS (polydimethylsiloxane)/PTFE polytetrafluoroethylene pervaporation hollow-fiber membrane

A technology of pervaporation and fiber membrane, applied in chemical instruments and methods, semi-permeable membrane separation, membrane technology, etc., can solve the problems of expensive materials, poor stability, etc., and achieve good selectivity, good support strength, and convenient operation Effect

Inactive Publication Date: 2014-10-01
陈雄
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of inorganic membranes due to expensive materials and liquid membranes due to their poor stability limit their industrial applications.

Method used

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  • Preparation method for PDMS (polydimethylsiloxane)/PTFE polytetrafluoroethylene pervaporation hollow-fiber membrane
  • Preparation method for PDMS (polydimethylsiloxane)/PTFE polytetrafluoroethylene pervaporation hollow-fiber membrane
  • Preparation method for PDMS (polydimethylsiloxane)/PTFE polytetrafluoroethylene pervaporation hollow-fiber membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Dissolve 10g of polydimethylsiloxane (PDMS) in 100g of n-hexane, add 0.4g of cross-linking agent ethyl orthosilicate, mix and stir at room temperature for 0.5 hours, add 0.1g of catalyst dibutyltin dilaurate, add n-hexane alkane until the concentration of polydimethylsiloxane in the mixed solution is 5 wt%, and after sealing, stir at room temperature for 4 hours, and the obtained solution is centrifuged and defoamed to make a film-making solution. Rinse polytetrafluoroethylene (PTFE) hollow fiber membranes with distilled water until neutral, dry them at room temperature, and use them as base membranes. The treated basement membrane is immersed in the membrane-forming solution for 1-3 seconds, taken out, and dried at room temperature. Repeat the film coating 4 times, then put it into a vacuum oven and dry it under vacuum at 110°C for 12 hours until it is completely cross-linked to obtain a PDMS / PTFE composite hollow fiber membrane. The outer layer of the obtained compos...

Embodiment 2

[0017] Dissolve 20g of polydimethylsiloxane in 40g of n-hexane, add 1.5g of crosslinking agent ethyl orthosilicate, mix and stir at room temperature for 4 hours, then add 1.0g of catalyst dibutyltin dilaurate, add n-hexane to mix The concentration of polydimethylsiloxane in the liquid is 30wt%, and after being sealed, it is stirred at room temperature for 24 hours, and the obtained solution is centrifuged and defoamed to make a film-making liquid. Rinse the PTFE hollow fiber membrane with distilled water until neutral, dry it at room temperature, and use it as the base membrane. The treated basement membrane is immersed in the membrane-forming solution for 1-3 seconds, taken out, and dried at room temperature. Repeat the film coating once, then put it into a vacuum oven and dry it under vacuum at 50°C for 12 hours until it is completely cross-linked to obtain a PDMS / PTFE composite hollow fiber membrane. The outer layer of the obtained composite hollow fiber membrane is a dens...

Embodiment 3

[0022] Dissolve 20g of polydimethylsiloxane in 100g of n-hexane, add 1.5g of crosslinking agent ethyl orthosilicate, mix and stir at room temperature for 2 hours, then add 0.3g of catalyst dibutyltin dilaurate, add n-hexane until mixed The concentration of polydimethylsiloxane in the liquid is 15 wt%, and after being sealed, it is stirred at room temperature for 14 hours, and the obtained solution is centrifuged and defoamed to make a film-making liquid. Rinse the PTFE hollow fiber membrane with distilled water until neutral, dry it at room temperature, and use it as the base membrane. The treated basement membrane is immersed in the membrane-forming solution for 1-3 seconds, taken out, and dried at room temperature. The coating was repeated twice, and then placed in a vacuum oven at 90°C for 14 hours in a vacuum until it was completely cross-linked to obtain a PDMS / PTFE composite hollow fiber membrane. The outer layer of the obtained composite hollow fiber membrane is a dens...

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Abstract

The invention discloses a preparation method for a PDMS (polydimethylsiloxane) / PTFE polytetrafluoroethylene pervaporation hollow-fiber membrane. The method comprises the following steps: dissolving 1 weight part of PDMS into n-hexane, adding 0.04 to 0.15 part of a cross-linking agent TEOS, carrying out mixing and stirring for 0.5 to 4 hours, adding 0.01 to 0.1 part of a catalyst dibutyltin dilaurate, supplementing n-hexane till the mass concentration percentage of PDMS in the mixed liquor is 5 to 35 percent, carrying out stirring at the room temperature for 4 to 24 hours, and carrying out centrifugation and defoaming to obtain a membrane preparation liquid; cleaning a PTFE hollow-fiber membrane with distilled water till the hollow-fiber membrane is neutral, airing the neutral hollow-fiber membrane, dipping the aired hollow-fiber membrane in the membrane preparation liquid for 1 to 3 seconds, taking out the hollow-fiber membrane for airing at the room temperature, carrying out membrane dipping and airing repeatedly for 1 to 4 times, placing the aired hollow-fiber membrane into a vacuum oven for 35 to 115 DEG C' vacuum drying till crosslinking is complete, so as to obtain the PDMS / PTFE compound hollow-fiber membrane. The method is simple in technology; the hollow-fiber membrane has better separation effect for an acetone / butanol / ethyl alcohol solution in a fermentation liquid.

Description

technical field [0001] The invention relates to a preparation method of a PDMS / PTFE (polydimethylsiloxane / polytetrafluoroethylene) composite hollow fiber membrane used for pervaporation preferentially permeating organic matter, and belongs to the field of pervaporation membrane separation. Background technique [0002] As early as 1861, Pasteur had discovered that bacteria could produce butanol. The product of butanol produced by biological fermentation (ABE fermentation) mainly contains acetone, butanol and ethanol, and the ratio of the three is 3:6:1. Inhibited by the product butanol, the total solvent concentration in the fermentation broth can only reach about 20gL -1 , lower production capacity. Because the boiling point of butanol is higher than that of water, 98% of the water needs to be separated from the fermentation broth when industrially using rectification to separate butanol. The whole process is economical and costly. In order to solve the above problems, sc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/70B01D69/12B01D67/00
Inventor 陈雄
Owner 陈雄
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