Method for preparing tetramethylethylene by olefin metathesis in fluidized bed
A technology for the disproportionation of tetramethylethylene and olefins, applied in chemical instruments and methods, physical/chemical process catalysts, organic chemistry, etc., can solve the problems of low yield of tetramethylethylene and short service life of catalysts, etc. Methylethylene selectivity, life extension, and effect of improving service life
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Embodiment 1
[0026] MCM-48 mesoporous molecular sieves were produced by conventional methods, with a pore size of 3.4 nm and a specific surface area of 1213 m 2 / gram.
[0027] Soak 1 kilogram of MCM-48 in 2 kilograms of deionized water for 10 minutes, beat for 10 minutes, add 200 grams of ammonium metatungstate solution containing 63 grams, and finally add 200 grams of silica sol (silicon oxide content 40%) and beat for 15 minutes to obtain 40% solids slurry. The slurry was spray-dried at an inlet air temperature of 600°C and an outlet air temperature of 350°C, and then baked in a muffle furnace at 550°C for 4 hours to make a catalyst. The average particle size of the catalyst was 60 microns. The bulk density and Wear index, results list 1.
[0028] Install 30 grams of catalyst in a Φ30mm fluidized bed reactor, use isobutylene as raw material at space velocity WHSV for 6 hours -1 , Catalyst performance was evaluated under the conditions of 400°C and 0.5MPa, the result list 2.
Embodiment 2～6
[0030] The same preparation process as in Example 1, only changing the proportion of different components and mesoporous molecular sieves, to obtain different catalysts, the average particle size of the catalysts is 60 microns, the bulk density and wear index of the catalysts are tested, and the results are listed in Table 1.
[0031] Install 30 grams of catalyst in a Φ30mm fluidized bed reactor, use isobutylene as raw material at space velocity WHSV for 6 hours -1 , Catalyst performance was evaluated under the conditions of 400°C and 0.5MPa, the result list 2.
[0032] Table 1 Physical property data of different catalysts
[0033]
[0034] Evaluation results of different catalysts in table 2
[0035] example
Embodiment 7～11
[0037] With the catalyst of Example 1, change the evaluation result list 3 of different process conditions.
[0038] Table 3 Catalyst activity evaluation results under different process conditions
[0039]
[0040] Note: Pressure is measured in absolute pressure.
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