NaA molecular sieve membrane element internal membrane preparation method
A molecular sieve and membrane element technology, applied in the field of molecular sieve membrane preparation, can solve the problems of uneven coating and batch difference of molecular sieve membrane, and achieve the effects of high permeation flux, simple method and excellent performance
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[0032] Example 1
[0033] The preparation device of NaA molecular sieve inner membrane provided by the present invention is as follows figure 1 As shown, the preparation steps are as figure 2 Shown.
[0034] Step 1: Preparation of seeded support
[0035] Such as figure 1 As shown, 10g of NaA molecular sieve seeds with an average particle size of about 2μm were weighed, dispersed in 990g of deionized water, and placed in the seed tank 2 on the stirrer 1, after stirring for 10 hours, ultrasonic dispersion for 30 minutes, to obtain NaA type Molecular sieve seed suspension 3, the concentration of the seed suspension is 10g / L; fix the mullite single tube support body 5 with Teflon raw material tape wound on the outer surface of the sealed two ends in the membrane module 4. The end sealing method of the pipe support body is as follows image 3 As shown in the middle shaded part, the end surface of one end of the single tube and the outer wall of the end part are coated with glue or glaze...
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[0038] Example 2
[0039] Step 1: Preparation of seeded support
[0040] Weigh 10g of NaA molecular sieve seeds with an average particle size of about 2μm, disperse them in 990g of deionized water, stir for 10 hours and then ultrasonically disperse for 30 minutes to obtain a NaA molecular sieve seed suspension with a concentration of 10g / L; A mullite five-channel support (50μm thick) wrapped with polytetrafluoroethylene raw material tape on the sealed outer surfaces of both ends is fixed in the membrane module, and then the NaA molecular sieve suspension is transported to the membrane at a flow rate of 0.5m / s through a diaphragm pump In the inner cavity of the support body 5, the molecular sieve suspension is circulated back to the seed tank. After the circulation time is controlled to 10s, the seed suspension in the inner cavity and the pipeline of the support body is emptied in the opposite direction (with the flow direction of the suspension when the crystal is coated On the co...
Example Embodiment
[0043] Example 3
[0044] Step 1: Preparation of seeded support
[0045] Weigh 100g of NaA molecular sieve seeds with an average particle size of about 10μm, disperse them in 900g of deionized water, stir for 10h, and ultrasonically disperse for 30min to obtain a NaA molecular sieve seed suspension with a concentration of 100g / L; The aluminum oxide four-channel support body wrapped with PTFE raw material tape on the sealed outer surface at both ends is fixed in the membrane module, and then the NaA molecular sieve suspension is transported to the inner cavity of the support body at a flow rate of 0.01 m / s through a slurry pump. The molecular sieve suspension is circulated in the seed tank. After 30 seconds of circulation, the inner cavity of the support and the seed suspension in the pipeline are emptied in the opposite direction, and then the support is taken out and placed in an oven for drying for use.
[0046] Step 2: Preparation of NaA molecular sieve membrane
[0047] Add sodiu...
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