A kind of method that mtbe and tba mixture prepares isobutylene
A mixture and isobutylene technology, applied in chemical instruments and methods, from oxygen-containing organic compounds to hydrocarbons, metal/metal oxides/metal hydroxide catalysts, etc., to achieve high conversion rate, save operation steps, and high selectivity Effect
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Embodiment 1
[0045] The aluminum hydroxide slurry LRJ1-2 containing tin and silicon in Comparative Example 2 was sprayed and dipped on the amorphous silicon-aluminum powder FM1-1 in Comparative Example 1, then dried at 120°C for 4h and calcined at 500°C for 6h. Then add small-pore alumina with a weight ratio of 10wt% as a binder, shape it into catalyst pellets with a particle size between 2.2 mm and 2.5 mm by spherical granulation molding method, dry at 120 ° C for 4 hours, and pass through 400 The catalyst was calcined at ℃ for 6h to obtain the catalyst SL-1, in which the weight ratio of alumina modified by silicon and tin to amorphous silicon aluminum was 1:10. The specific evaluation results in the fixed bed process are shown in Table 1.
Embodiment 2
[0047]Under the condition of stirring, tin tetrachloride and trimethylchlorosilane were slowly added to the aluminum hydroxide slurry LRJ2 (solid content 31.2wt%) respectively. A mixed slurry containing silicon and tin (LRJ2-2) was obtained, wherein the amount of tin tetrachloride added in terms of tin accounted for 0.65wt% of pseudo-boehmite based on the weight of alumina; the amount of trimethylchlorosilane calculated in terms of silicon The added amount accounts for 0.85wt% of the pseudo-boehmite based on the weight of alumina. This slurry was spray-dipped on the amorphous silicon-alumina powder FM1-1 in Comparative Example 1, then dried at 90°C for 8 hours, and then calcined at 600°C for 3 hours. Then add 7.5wt% small-porous alumina and 2.0wt% methylcellulose as binder and molding aid respectively, and shape it into a particle size of 2.6mm-2.9mm by spherical granulation molding method The catalyst pellets were dried at 90°C for 8h and calcined at 650°C for 3h to obtain c...
Embodiment 3
[0049] The amorphous silicon aluminum powder FM2 (wherein SiO 2 Content 82.2wt%, Al 2 o 3 The content is 17.8wt%; the specific surface area is 335m 2 / g, the pore volume is 0.78mL / g), after being treated with saturated water vapor at 200℃ for 16h, impregnated in an appropriate amount of Be(NO 3 ) 2 Aqueous solution (solution concentration: 1.50mol / L), then roasted at 500°C for 5h to obtain amorphous silicon-aluminum powder FM2-1 containing 1.02wt% beryllium oxide. The mixed slurry LRJ1-2 containing tin and silicon in Comparative Example 2 was sprayed and dipped onto the amorphous silicon-aluminum powder FM2-1, then dried at 150°C for 1.5h, and calcined at 650°C for 4h. Then add small-pore alumina with a weight ratio of 18wt% as a binder, shape it into catalyst pellets with a particle size between 2.2 mm and 2.5 mm by spherical granulation molding method, dry at 120 ° C for 4 hours, and pass through 400 The catalyst was calcined at ℃ for 6h to obtain catalyst SL-3, in whic...
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