Filtration method of nanometer molecular screen
A nano-molecular sieve and filtration method technology, which is applied in the field of nano-molecular sieve filtration, can solve the problems of easy flocculation, clogged pores, and affecting the life of molecular sieves, and achieve the effects of avoiding flocculation, promoting flocculation, and accelerating the filtration rate
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Embodiment 1
[0030] Mix 170 ml of the above-mentioned nano-beta molecular sieve slurry (50 g on a dry basis) with 7 ml of 45% NaOH solution, stir evenly, and the slurry is viscous; add a mixture of 220 ml of ethanol and 70 ml of water, and stir evenly until the slurry flocculates. The pH was 12-13 and the solid product was isolated by filtration. Filtration was completed within 6 min, and the filtrate was clarified. Determination of SiO in filtrate and filter cake respectively 2 and SiO 2 / Al 2 o 3 . To evaluate the catalytic performance. Record it as A1. Properties are listed in Table 1.
Embodiment 2
[0032] Mix 170 ml of the above-mentioned nano-beta molecular sieve slurry (50 g on a dry basis) with 7 ml of 45% NaOH solution, stir evenly, and the slurry is viscous; then add a mixture of 600 ml of ethanol and 120 ml of water, and stir until the slurry is flocculated to maintain a pH of 12 -13, the filtration is completed within 30 minutes, the water content of the filter cake is large, and the filtrate is clear. Determination of SiO in filtrate and filter cake respectively 2 and SiO 2 / Al 2 o 3 . To evaluate the catalytic performance. Record it as A2. Properties are listed in Table 1.
Embodiment 3
[0034] Mix 170 ml of the above-mentioned nano-beta molecular sieve slurry (50 g on a dry basis) with 7 ml of 45% NaOH solution, stir evenly, and the slurry becomes viscous; add 220 ml of ethanol, and stir evenly until the slurry flocculates. The pH was 12-13 and the solid product was isolated by filtration. Filtration was completed within 6 min, and the filtrate was clarified. Determination of SiO in filtrate and filter cake respectively 2 and SiO 2 / Al 2 o 3 . To evaluate the catalytic performance. Record it as A3. Properties are listed in Table 1.
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