A kind of preparation method of acetic acid dehydration ZSM-5 zeolite membrane
A technology of ZSM-5 and zeolite membrane, which is applied in the direction of crystalline aluminosilicate zeolite, borocarbane silicone crystalline aluminosilicate zeolite, etc., which can solve the problems of low separation selectivity and low acid-resistant flux of zeolite molecular sieve membrane , to achieve the effect of continuous and uniform film layer, stable performance of acetic acid dehydration and separation, and thin film layer
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[0042] Example 1
[0043] ①Pretreatment of the carrier tube: sand the surface of the carrier tube with 600 mesh and 800 mesh waterproof sandpaper in sequence until the carrier surface is smooth, and then ultrasonically vibrate with acid and alkali to remove the residue in the carrier hole, and wash with deionized water to neutral Then dry naturally, and finally dry at 150°C for use.
[0044] ②Pre-planting seed crystals: introducing large seed crystals by hot dipping method, using figure 1 The structural element shown is that the zeolite molecular sieve cluster composed of ZSM-5 with a grain size of about 100 nm is a large seed crystal, α-Al 2 O 3 The two ends of the carrier tube are sealed with polytetrafluoroethylene plugs. This is to force the seed crystals to be introduced only to the outer surface of the carrier, and the pressure difference on the carrier surface can be generated during thermal dipping; the sealed carrier tube is placed in an oven at 175℃ for heating 2h, then q...
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[0052] Example 2
[0053] The preparation method is the same as in Example 1. The Si / Al in the crystallization mother liquor is changed to 20, 30, and 40, which are respectively denoted as Z02, Z03, and Z04.
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[0054] Example 3
[0055] The preparation method was the same as in Example 1, and the synthesis time was changed to 24h and 72h, which were recorded as Z05 and Z06 respectively.
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