Preparation method of polymethoxy acetal
A technology of polymethoxymethylacetal and trioxymethylene, applied in chemical instruments and methods, preparation of organic compounds, molecular sieve catalysts, etc., can solve problems such as catalyst corrosion, achieve simple separation, high reaction conversion rate and Product yield and low energy consumption
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Embodiment 1
[0024] By 1SiO 2 : 0.01Al 2 o 3 : 0.41TEAOH: 0.31 acetylacetone: 31.76H 2 O Weigh each material, dissolve sodium aluminate in distilled water, add tetraethylammonium hydroxide dropwise, stir for 1 hour, then add ethyl orthosilicate dropwise, stir for 1 hour, then add acetylacetone, stir for 1 hour , adjusted to pH = 13.0 with 0.1N sodium hydroxide solution, and continued to stir for 5 hours. The resulting mixture was crystallized under hydrothermal conditions at 170°C for 4 days, washed, filtered and dried. The XRD spectrum of the obtained product is shown in figure 2 In curve 1, the relative intensity of (020), (040), (060) and (080) peaks in the diffraction spectrum is significantly increased, which shows that the synthesized product grows preferentially in the (010) direction (b-axis).
[0025] The synthesized raw ZSM-5 zeolite powder was treated with 0.8 mol / L acetic acid at 70°C for 5 hours for 4 consecutive times, wherein the weight ratio of the acid solution to the...
Embodiment 2
[0028] By 1SiO 2 : 0.01Al 2 o 3 : 0.25TPAOH : 0.05 sodium oxalate : 32.0H 2 O Weigh each material, dissolve sodium aluminate in distilled water, add tetrapropylammonium hydroxide dropwise, stir for 1 hour, then add silica sol dropwise, stir for 1 hour, then add sodium oxalate, stir for 1 hour, use 0.1 N sodium hydroxide solution was used to adjust the pH to 12.0, and stirring was continued for another 5 hours. The resulting mixture was crystallized under hydrothermal conditions at 200°C for 3 days, washed, filtered and dried. XRD spectrum see figure 2 In curve 2, the relative intensity of (020), (040), (060) and (080) peaks in the diffraction spectrum is significantly increased, which shows that the synthesized product grows preferentially in the (010) direction (b-axis). The synthesized raw ZSM-5 zeolite powder was treated with 0.8 mol / L acetic acid at 70°C for 5 hours for 4 consecutive times, wherein the weight ratio of the acid solution to the ZSM-5 zeolite was 9 to obt...
Embodiment 3
[0031] By 1SiO 2 : 0.02Al 2 o 3 : 0.23TEAOH: 0.278-hydroxyquinoline: 44.64H 2 O Weigh each material, dissolve aluminum triethoxide in distilled water, add tetraethylammonium hydroxide dropwise, stir for 1 hour, then add silica sol dropwise, stir for 1 hour, then add 8-hydroxyquinoline, stir for 1 hour , adjust pH=11.0 with 0.1N sodium hydroxide solution, and continue stirring for 5 hours. The resulting mixture was crystallized under hydrothermal conditions at 150°C for 6 days, washed, filtered and dried. XRD spectrum see figure 2 In curve 3, the relative intensity of (020), (040), (060) and (080) peaks in the diffraction spectrum is significantly increased, which shows that the synthesized product grows preferentially in the (010) direction (b-axis). The synthesized raw ZSM-5 zeolite powder was treated with 0.8 mol / L acetic acid at 80°C for 5 hours for 3 consecutive times, wherein the weight ratio of the acid solution to the ZSM-5 zeolite was 8 to obtain HZSM-5.
[0032...
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