Preparation method and application of acid-resistant T-NaY type zeolite molecular sieve composite membrane
A technology of zeolite molecular sieves and composite membranes, which is applied in separation methods, chemical instruments and methods, membranes, etc., can solve problems such as damaged structures, failures, and limited application ranges, and achieve high permeation flux effects
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Embodiment 1
[0039] The preparation method is carried out sequentially from step (1) to step (3), and each step is described.
[0040] Step (1): preparing T-type zeolite molecular sieve seed crystal suspension and NaY-type zeolite molecular sieve synthesis liquid;
[0041] ① configure the T-type zeolite molecular sieve seed crystal suspension, the process is:
[0042] Process (1-1): Dissolve NaOH and KOH in deionized water, cool to room temperature, add template agent tetramethylammonium hydroxide and stir until the solution is clear to obtain a mixed lye;
[0043] Process (1-2): NaAlO 2 The powder is gradually added to the mixed lye, and stirred until clarified, then slowly dropwise added silica sol, stirred at room temperature for 12 hours to obtain a milky synthetic liquid, the mole of the substance in the milky synthetic liquid than n(SiO 2 ):n(Al 2 o 3 ):n(Na 2 O):n(K 2 O):n(TMAOH):n(H 2 (0)=18.2:1:4.2:1.5:1.82:212.7;
[0044] Process (1-3): Transfer the milky synthetic liqui...
Embodiment 2
[0062] The preparation method is carried out sequentially from step (1) to step (3), and each step is described.
[0063] Step (1): preparing T-type zeolite molecular sieve seed crystal suspension and NaY-type zeolite molecular sieve synthesis liquid;
[0064] The specific process is exactly the same as that of Implementation 1, and will not be repeated here.
[0065] Step (2): coating the T-type zeolite molecular sieve seed crystal suspension on the surface of the carrier, drying, and roasting to obtain a carrier loaded with T-type zeolite molecular sieve seed crystals;
[0066] In this embodiment, the carrier is disc-shaped porous alumina (diameter: 13 mm, average pore diameter: 200 nm).
[0067] Put the disc-shaped porous alumina in a spin coater, drop 1 ml of the above-mentioned T-type zeolite molecular sieve seed crystal suspension on the carrier with a dropper, and keep the rotation speed of the spin coater at 2000 rpm for 30 seconds. After taking it out, put it in an ...
Embodiment 3
[0072] The preparation method is carried out sequentially from step (1) to step (3), and each step is described.
[0073] The preparation step (1) to step (3) of present embodiment 3, and the difference in embodiment 1 only lies in,
[0074] (i) In step (1), for process (1-5), the quality of the T-type zeolite molecular sieve powder used in Example 1 is 0.3g, and the T-type zeolite molecular sieve powder used in Example 3 is 0.1g;
[0075] (ii) In step (2), the porous α-Al of embodiment 1 2 o 3 Hollow ceramic fiber tube preheating time is 120 minutes, and embodiment 3 is to porous α-Al 2 o 3 The preheating time of the hollow ceramic fiber tube is 20 minutes;
[0076] Others are all the same and will not be described repeatedly.
[0077] Figure 7 For the surface SEM picture of the tubular carrier T-NaY type zeolite molecular sieve composite membrane obtained above, it can be seen from the picture that the prepared T-NaY type zeolite molecular sieve composite membrane is ...
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