A modified porous membrane material, preparation method and liquid membrane separation method of carbon dioxide
A carbon dioxide and liquid membrane separation technology, which is applied in separation methods, semi-permeable membrane separation, dispersed particle separation, etc., can solve problems such as the loss of supporting liquid membrane membrane liquid, achieve the effect of avoiding loss and improving the convenience of use
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[0043] The preparation method of the above-mentioned modified porous membrane material comprises the following steps:
[0044] The silane coupling agent containing amine groups is dissolved in an organic solvent as a modifier; the porous membrane material is immersed in the modifier for grafting reaction. After the reaction is completed, it is cleaned and dried to obtain a modified porous membrane material.
[0045] In one embodiment, the silane coupling agent containing amine groups: selected from, for example, N, N-dimethyl-3-aminopropyltrimethoxysilane, (3-aminopropyl)trimethoxysilane, etc. wait.
[0046] In one embodiment, the organic solvent contains at least one of ethanol, acetone, dimethylacetamide (DMAC), and tetrahydrofuran (THF).
[0047] In one embodiment, the reaction conditions are that the temperature is 20-40° C., and the reaction time is 1-24 h.
Embodiment 1
[0049]Wash the inner membrane of the tubular ceramic membrane with an average pore diameter of 100 nm (geometric dimensions: the effective length of the membrane is 8cm, the outer diameter is 12cm, the inner diameter is 8cm, and the porosity is about 40%) and put it in a drying oven to dry for 1 to 2 hours , the silane coupling agent (N,N-dimethyl-3-aminopropyltrimethoxysilane (DMAPS)) containing amine groups was added dropwise into anhydrous ethanol to prepare a modified 15mmol / L Solution, immerse the porous membrane material in the modification solution, react in a constant temperature water bath at 35°C for 12 hours, wash and dry after the full reaction is completed, and obtain a membrane material with tertiary amine groups on the surface. The surface infrared spectrum of the modified membrane material is as follows: figure 1 shown. (N,N-Dimethyl-3-aminopropyl)trimethoxysilane (DMAPS) has the following structure:
[0050]
[0051] Comparing the infrared spectra of the ...
Embodiment 2
[0055] Wash the inner membrane of the tubular ceramic membrane with an average pore diameter of 200nm (geometric dimensions: the effective length of the membrane is 8cm, the outer diameter is 12cm, the inner diameter is 8cm, and the porosity is about 40%) and put it in a drying oven to dry for 1-2 hours. Add the silane coupling agent containing amine groups ((3-aminopropyl)trimethoxysilane) dropwise into acetone and dissolve to prepare a 50 mmol / L modification solution, and immerse the porous membrane material in the modification solution In the process, the reaction was carried out in a constant temperature water bath at a temperature of 30°C for 24 hours, and after the full reaction was completed, it was washed and dried to obtain a membrane material with tertiary amine groups on the surface. The membrane material is used in the gas absorption of the gas-liquid membrane contactor, and water is used as the absorbent, and it is found that the mass transfer flux of carbon dioxid...
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