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Hydrophobic modified PDMS membrane and preparation method thereof
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A hydrophobic modification, membrane embryo technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc. Simple, low production cost effect
Inactive Publication Date: 2011-09-21
ZHEJIANG UNIV
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Other polymer materials such as polyvinylidene fluoride, Chinese invention patent CN1239012 prepared a polyvinylidene fluoride membrane for pervaporation separation of ethanol aqueous solution, when the concentration of the feed liquid is 0.1%, the separation factor reaches 13.1, and the permeation flux reaches 1125g / m 2 h, when the concentration of feed liquid increases, the separation factor shows a downward trend. At the same time, due to the influence of polyvinylidene fluoridecrystallinity on the membrane, the prepared membrane has defects, which limits the wide application of this material in pervaporation membranes
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Embodiment 1
[0020] 1) Dissolve 2g of PDMS with a viscosity-average molecular weight of 20,000 in 20g of n-hexane, and stir evenly at 60°C;
[0022] 3) After stirring for 4 hours, scrape the film directly on the polyacrylonitrile base film to obtain a 15 μm film blank;
[0023] 4) The film blank was vulcanized at room temperature for 2 hours, then placed in a vacuum oven at 60°C for 8 hours, taken out, and stored at room temperature.
[0024] The preferential alcohol permeability of the obtained PDMS membrane to ethanol aqueous solution with a concentration of 5wt%-7wt% was measured, and the results are shown in Table 1.
[0025] Under the different temperatures of table 1, the preferential alcoholpenetration test result of example 1
[0026] temperature(℃)
Embodiment 2
[0042] 1) Dissolve 2g of PDMS with a viscosity-average molecular weight of 15,000 in 20g of n-hexane, and stir evenly at 60°C;
[0044] 3) After stirring for 4 hours, scrape the film directly on the polyacrylonitrile base film to obtain a 35 μm film blank;
[0045] 4) The film blank was vulcanized at room temperature for 2 hours, then placed in a vacuum oven at 60°C for 8 hours, taken out, and stored at room temperature.
[0046]At 60°C, the prepared PDMS membrane was measured for its alcohol-preferential permeation performance to a concentration of 5wt%-7wt% ethanol aqueous solution,
[0047] The permeation flux is 806.2g / m 2 h, the separation factor is 15.4.
Embodiment 3
[0049] 1) Dissolve 2g of PDMS with a viscosity-average molecular weight of 5000 in 20g of n-heptane, and stir evenly at 60°C;
[0051] 3) After stirring for 4 hours, scrape the film directly on the polyacrylonitrile base film to obtain a 20 μm film blank;
[0052] 4) The film blank was vulcanized at room temperature for 2 hours, then placed in a vacuum oven at 60°C for 8 hours, taken out, and stored at room temperature.
[0053] At 60°C, the prepared PDMS membrane was measured for its alcohol-preferential permeation performance to a concentration of 5wt%-7wt% ethanol aqueous solution,
[0054] The permeation flux is 792.3g / m 2 h, the separation factor is 14.2.
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Abstract
The invention discloses a hydrophobic modified PDMS membrane and a preparation method thereof. The preparation method comprises: dissolving PDMS, a crosslinking agent and a catalyst in solvent according to a certain proportion to obtain a casting membrane solution through reaction; deaerating and standing the casting membrane solution and obtaining a membrane blank by scraping a bottom membrane; and carrying out heating sulfuration of the membrane blank after sulfuration at room temperature to obtain a PDMS pervaporation membrane. The preparation method adopts vinyltriethoxysilane as the crosslinking agent, and the obtained PDMS membrane has the characteristics of high separation performance and ideal stability when used in pervaporation separation of ethanolaqueous solution. As for a 6 wt percent ethanolaqueous solution, a separation factor is equal to 16.0 at 60 DEG C, and penetration flux J is equal to 644.8g / m<2>h. Moreover, the preparation method and the membrane have low production cost and excellent industrial application prospects.
Description
technical field [0001] The invention relates to a PDMS membrane which can be used for pervaporation preferentially permeating alcohol, and belongs to the field of pervaporation membrane separation. Background technique [0002] In recent years, with the increasingly prominent environmental and energy issues, cleaner production and energy regeneration have received widespread attention. Membrane separation technology, as a clean and energy-saving industrial technology, has also been widely used in industry, among which , the removal of volatile organic compounds in water is a typical direction. [0003] With the development of biomass energy, fermentation to ethanol has become an important direction for the development of clean energy in the future. Since the fermentation method generally can only produce 8%-10% ethanol dilute solution, and ethanol as a product has a strong inhibitory effect on the reaction, for most yeasts, when the ethanol concentration reaches 5%, it will...
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Application Information
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