Preparation of SAPO-34 molecular sieve film for selectively separating methane gas
A SAPO-34, a technology for separating methane, applied in semi-permeable membrane separation, chemical instruments and methods, membrane technology and other directions, can solve the problems of no patent reports, reduce membrane permeability, increase paths, etc., to achieve good separation performance, repeatability Good performance and high repeatability
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[0030] Example 1
[0031] Step A: Synthesis of SAPO-34 Molecular Sieve Seeds
[0032] Add 2 g of aluminum isopropoxide to 5 g of deionized water and stir well for hydrolysis. 1 g phosphoric acid solution (H 3 PO 4 , mass fraction 85%), 8.47 g tetraethylammonium hydroxide aqueous solution (TEAOH, mass fraction 20%), 0.32 g silica sol (SiO 2 Aqueous solution, mass fraction 30%), add 0.3 g of concentrated hydrochloric acid solution (HCl, mass fraction 37%), the pH value of the reaction mother liquor is 6 at this time, 180 ° C hydrothermal crystallization for 3 days, the product is taken out and washed with deionized water Drying to obtain seed crystal powder, the grain size of which is 3-5 microns.
[0033] Step B: Preparation of Seed Base Film
[0034] Add deionized water to the crystal seed powder obtained in step A, make a suspension of 3g / L, and use an ultrasonic cleaner (KQ-100DE type CNC ultrasonic Cleaner, Kunshan Ultrasonic Instrument Co., Ltd.) with deionized water...
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[0037] Example 2
[0038] The difference from Example 1 is that after the synthesis, step C of Example 1 is repeated to synthesize the SAPO-34 molecular sieve membrane once again to repair the intercrystalline defects on the surface of the membrane. It can be seen from Table 1 that the separation performance of the membrane is further improved.
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[0039] Example 3
[0040] The difference from Example 1 is that three samples are used in parallel tests according to this ratio to test the repeatability, and the rest are the same as those in Example 1. The results are listed in Table 2, and it can be seen that this method has good repeatability.
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