A kind of preparation method of mfi molecular sieve membrane
A molecular sieve and seed crystal technology, applied in membrane technology, semi-permeable membrane separation, chemical instruments and methods, etc., can solve the problems of many molecular sieve membrane defects, MFI molecular sieve membrane thickness, and permeability performance need to be improved, so as to achieve good compactness, Good thickness, easy to control the effect
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Embodiment 1
[0028] The MFI molecular sieve crystal seeds were mixed in 100 g of an aqueous solution with a mass concentration of 1% diethanolamine, wherein the quality of the added MFI molecular sieve crystal seeds was 1% of the quality of the aqueous solution of diethanolamine, and after stirring at room temperature for 1 hour, filtration and washing were performed to obtain the amine. base crystal seed; add silica sol, tetrapropyl ammonium hydroxide and water to a stainless steel reaction kettle with a polytetrafluoroethylene lining and mix evenly to obtain a mixed sol, in which the silicon source generates SiO according to the theory 2 Quantity, the added silica sol, tetrapropyl ammonium hydroxide (A) and water are by weight: H 2 O / SiO 2 =120; A / SiO 2 =0.15; will account for the silicon source in the mixed sol as SiO 2 1 wt % of the aminated seed crystals were added to the above mixed sol, stirred at room temperature for 3 h until uniform, to obtain a mixed material; then the pretrea...
Embodiment 2
[0030] The MFI molecular sieve crystal seeds were mixed in 100 g of an aqueous solution with a mass concentration of 1% diethanolamine, wherein the quality of the MFI molecular sieve crystal seeds was 0.5% of the quality of the aqueous solution of diethanolamine, and after stirring at 50 ° C for 1 hour, filtration and washing were performed to obtain amine base crystal seed; add alumina, silica sol, tetrapropyl ammonium hydroxide and water to a stainless steel reaction kettle with a polytetrafluoroethylene lining and mix evenly to obtain a mixed sol, in which the silicon source generates SiO according to the theory 2 Aluminium source produces Al theoretically 2 O 3 Quantity, the added silica sol, tetrapropyl ammonium hydroxide (A) and water are by weight: H 2 O / SiO 2 =500; A / SiO 2 = 0.10; Al 2 O 3 / SiO 2 =0.01; will account for the silicon source in the mixed sol as SiO 2 5 wt% of the aminated seed crystals were added to the above mixed sol, stirred at room temperature ...
Embodiment 3
[0032] Others are the same as in Example 2, except that the amination reagent is 100 g of an aqueous solution with a mass concentration of 0.5% diethanolamine. Mixed sol, silicon source generates SiO theoretically 2 Aluminium source produces Al theoretically 2 O 3 Quantity, the added silica sol, tetrapropyl ammonium hydroxide (A) and water are by weight: H 2 O / SiO 2 =500; A / SiO 2 = 0.10; Al 2 O 3 / SiO 2 =0.03. Finally, a dense and uniform MFI molecular sieve membrane c was obtained. The SEM and XRD patterns are similar to Example 1.
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