A kind of propylene epoxidation reaction method
A technology of propylene and propylene oxide, applied in the field of preparation of known compounds, can solve the problems of interphase backmixing and particle loss in a fluidized bed, high pressure drop in a fixed bed, affecting reaction performance, etc. Effects of reduced lamination and high mass transfer efficiency
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Embodiment 1
[0046] This example illustrates the preparation method of composite magnetic Ti-MWW molecular sieve catalyst microspheres
[0047] (1) Superparamagnetic NiFe 2 o 4 The material powder is mixed with silica sol (30wt%), kale powder and deionized water in a mass ratio of 1:20:0.02 to form a 35wt% slurry, and then prepared into 50-70 micron SiO 2 Coated NiFe 2 o 4 Magnetic microspheres NiFe 2 o 4 @SiO 2 , and then baked at 500°C for 6h for later use.
[0048] (2) Tetrabutyl titanate (TBOT) was added dropwise to 35% concentration of H at a mass ratio of 1:2 at room temperature 2 o 2 solution, while stirring for 1 hour, a yellow clear Ti solution was obtained. Boric acid is mixed with the above-mentioned Ti solution under stirring, and the NiFe obtained in (1) is added 2 o 4 @SiO 2 Add magnetic microspheres as silicon source and piperidine (PI) to the above mixed solution, stir and mix evenly to obtain the following raw material molar ratio of the mixture slurry: SiO 2 ...
Embodiment 2～4
[0051] This example illustrates the preparation method of composite magnetic Ti-MWW molecular sieve catalyst microspheres
[0052] Examples The catalyst preparation process is the same as in Example 1, except that there are differences in the selection of superparamagnetic materials, and the molar composition of the template agent and crystallization precursor solution used in the synthesis is also different, as shown in Table 1. Show.
[0053] Table 1
[0054]
Embodiment 5～9
[0056] These examples illustrate that using different magnetic composite Ti-MWW molecular sieve catalysts, the processes provided by the present invention all have good propylene epoxidation reaction effects. For comparison, the VS-1 catalyst prepared in Comparative Example 1 was tested in the absence of a magnetic field, and the results are shown in Table 2.
[0057] In the test, 100 mg of different catalysts with a particle size of 50-70 microns were loaded into a reactor with an inner diameter of 16 mm and a height of 300 mm; four inner diameters were 60 mm, outer diameters were 165 mm, heights were 50 mm, and the number of turns 390 coils are arranged axially along the reactor to provide a uniform magnetic field, and the distance between the coils is 25 millimeters; the concentration is 30.0wt% H 2 o 2 The solution and the acetonitrile solvent are mixed and input into the preheater, wherein the concentration in the acetonitrile mixed solution is 65wt%, and mixed with the ...
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