Preparation method and application of a hollow fiber composite molecular sieve membrane
A fiber composite and molecular sieve membrane technology, applied in chemical instruments and methods, membranes, membrane technology, etc., can solve the problems of poor binding force, performance degradation, poor binding force of molecular sieve membrane layers, etc., and achieve the effect of preventing poor binding force
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Embodiment 1
[0054] Prepare support body: choose four-channel α-Al 2 o 3 The hollow fiber support has an average pore diameter of 640nm, a porosity of 48%, and an outer diameter of 3.75mm. There are finger-shaped holes distributed on the inside / outside of the support. Wash and dry after 3 minutes. Its surface, cross-sectional view as Figure 2a , Figure 2b shown.
[0055] Preparation of the first molecular sieve membrane: Put the support body into the seed liquid with a concentration of 1wt% MOR (+0.125% HPC hydroxypropyl cellulose) and vacuum suction, so that the seed crystals are oriented from the outer surface into the finger-shaped holes, and the MOR The size of the seed crystal is about 100nm, pumped for 2min, and the vacuum degree of suction is controlled at 0.05MPa, then wipe the surface, repeat twice, put it in an oven at 60°C for 4h, and then put it in a muffle furnace for 4h at 400°C. Put the support body into the MOR synthesis solution, the molar ratio of the synthesis sol...
Embodiment 2
[0065] Prepare support body: choose four-channel α-Al 2 o 3 The hollow fiber support has an average pore diameter of 550 nm, a porosity of 50%, and an outer diameter of 3.65 mm. There are finger-shaped holes distributed on its outer surface, and the diameter of the holes ranges from 3 to 5 μm. The surface of the support body is polished with sandpaper for 30 seconds, cleaned and dried after ultrasonication for 3 minutes.
[0066] Preparation of the first molecular sieve membrane: Put the support body into the seed liquid with a concentration of 0.5wt% MOR (+0.125% HPC) and vacuum pump it, so that the seed crystals enter the finger-shaped holes from the outer surface. The size of the MOR seed crystals is about Pump at 100nm for 2min, control the suction vacuum at 0.05MPa, then wipe the surface, repeat twice, put it in an oven at 60°C for 4h, then put it in a muffle furnace for 4h at 400°C. Put the support body into the MOR synthesis solution, the ratio of the synthesis soluti...
Embodiment 3
[0070] Prepare support body: choose four-channel α-Al 2 o 3 The hollow fiber support has an average pore diameter of 480nm, a porosity of 39%, and an outer diameter of 3.72mm. There are finger-shaped pores distributed on the outer surface, and the diameter of the pores ranges from 3 to 5 μm. The outer surface of the support is polished, cleaned and dried.
[0071] Preparation of the first molecular sieve membrane: Put the support body into the seed liquid with a concentration of 1wt% MOR (+0.125wt%HPC) and vacuum pump it, so that the crystal seeds enter the finger-shaped holes from the outer surface. The size of the MOR seed crystals is 200nm, suction for 2min, the suction vacuum degree is controlled at 0.05MPa, then wipe the surface, repeat twice, put it in a 60℃ oven for 4h, then put it in a muffle furnace for 4h at 400℃. Put the support body into the MOR synthesis solution, the ratio of the synthesis solution: 0.36N0aOH:1SiO 2 :1 / 30Al 2 o 3 :100H 2 O, the synthesis tim...
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