Process for the preparation of tetramethylethylene
A technology of dimethyl and butene, applied in chemical instruments and methods, hydrocarbons, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of low weight selectivity of target products
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Embodiment 1
[0032] The chromatographic silica gel of 71 grams, 10 grams of silica sol (containing the silicon oxide of 40% by weight), 2 grams of samarium oxide and 2 grams of scallop powder are mixed and put into the blender, after stirring for 12 minutes, add 5 grams of niobium oxide and 20 grams of magnesia was added to 250 grams of deionized water, kneaded for 2 hours, extruded, dried at 100°C for 4 hours, and calcined at 550°C for 4 hours in an air atmosphere to obtain a catalyst, which was designated as SL-1.
[0033] The evaluation of the catalyst was carried out on an olefin disproportionation evaluation device, and the raw material was 99.7% isobutene in terms of mass fraction. The reaction is at a temperature of 350°C, a pressure of 0.6MPa in absolute pressure, and a weight space velocity of isobutylene of 10 hours -1 The evaluation was carried out under the conditions, and the evaluation results are shown in Table 1.
Embodiment 2
[0035] 46.25 grams of chromatographic silica gel, 15 grams of aluminum sol (containing 25% by weight of aluminum oxide), 5 grams of praseodymium oxide and 1 gram of scallop powder were mixed and put into a blender, and after stirring for 20 minutes, 10 grams of tin oxide and Add 25 grams of sodium oxide and 300 grams of deionized water, knead for 2.5 hours, extrude, dry at 100°C for 4 hours, and roast at 550°C for 6 hours under nitrogen atmosphere to obtain the catalyst, which is designated as SL-2.
[0036] The evaluation of the catalyst was carried out on an olefin disproportionation evaluation device, and the raw material was 99.7% isobutene in terms of mass fraction. The reaction is at a temperature of 350°C, a pressure of 0.6MPa in absolute pressure, and a weight space velocity of isobutylene of 10 hours -1 The evaluation was carried out under the conditions, and the evaluation results are shown in Table 1.
Embodiment 3
[0038] 12.5 g of γ-Al 2 o 3 , 50 grams of aluminum sol (containing 25% by weight of aluminum oxide) and 3 grams of turnip powder are mixed evenly and put into a blender, after stirring for 25 minutes, add 20 grams of bismuth oxide, 20 grams of magnesium oxide, 20 grams of rubidium oxide and 10 grams of Calcium oxide, then add 400 g of deionized water, knead for 2.5 hours, extrude, dry at 120°C for 3 hours, and roast at 500°C for 5 hours in air atmosphere to obtain the catalyst, which is designated as SL-3.
[0039] The evaluation of the catalyst was carried out on an olefin disproportionation evaluation device, and the raw material was 99.7% isobutene in terms of mass fraction. The reaction is at a temperature of 350°C, a pressure of 0.6MPa in absolute pressure, and a weight space velocity of isobutylene of 10 hours -1 The evaluation was carried out under the conditions, and the evaluation results are shown in Table 1.
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