Method for producing tetramethylethylene by disproportionation of isobutene
A technology of tetramethylethylene and isobutylene, applied in chemical instruments and methods, organic chemistry, hydrocarbons and other directions, can solve the problem of low selectivity of target products, achieve increased weight selectivity, good technical effect, and improved selectivity Effect
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Embodiment 1
[0039] A solution containing 18.6 grams of diammonium hydrogen phosphate and 940 grams of γ-Al 2 o 3 Mix evenly and put it in a blender, add 10 grams of asparagus powder and stir for 12 minutes, then add 61.3 grams of ammonium dimolybdate, then add 2.5 kilograms of deionized water, knead for 0.5 hours and then extrude, and put the extruded catalyst at 100 ° C Dry at 550°C for 3 hours, and bake at 550°C for 4 hours to obtain a finished catalyst, which is designated as SL-1.
[0040] The evaluation of the catalyst was carried out on an olefin disproportionation evaluation device, and the raw material was 99.9% isobutene in terms of mass fraction. The reaction is at a temperature of 120°C, a pressure of 0.6MPa in absolute pressure, and a weight space velocity of isobutylene of 4 hours -1 Under the conditions, the evaluation results are shown in Table 1.
Embodiment 2
[0042] A solution containing 37.2 grams of diammonium hydrogen phosphate and 900 grams of γ-Al 2 o 3 Mix evenly and put it in a mixer, add 10 grams of scallop powder and stir for 12 minutes, then add 98 grams of ammonium dimolybdate and 10 grams of ammonium metatungstate, then add 2.5 kg of deionized water, knead for 0.5 hours and then extrude into strips. The strip-shaped catalyst was dried at 100°C for 3 hours and calcined at 550°C for 4 hours to obtain a finished catalyst, which was designated as SL-2.
[0043] The evaluation of the catalyst was carried out on an olefin disproportionation evaluation device, and the raw material was 99.9% isobutene in terms of mass fraction. The reaction is at a temperature of 120°C, a pressure of 0.6MPa in absolute pressure, and a weight space velocity of isobutylene of 4 hours -1 Under the conditions, the evaluation results are shown in Table 1.
Embodiment 3
[0045] A solution containing 55.8 grams of diammonium hydrogen phosphate and 820 grams of γ-Al 2 o 3 Mix evenly and put it in a blender, add 10 grams of asparagus powder and stir for 12 minutes, then add 183.9 grams of ammonium dimolybdate, then add 2.5 kilograms of deionized water, knead for 0.5 hours and then extrude, and put the extruded catalyst at 100 ° C Dry at 550°C for 3 hours, and bake at 550°C for 4 hours to obtain a finished catalyst, which is designated as SL-3.
[0046] The evaluation of the catalyst was carried out on an olefin disproportionation evaluation device, and the raw material was 99.9% isobutene in terms of mass fraction. The reaction is at a temperature of 120°C, a pressure of 0.6MPa in absolute pressure, and a weight space velocity of isobutylene of 4 hours -1 Under the conditions, the evaluation results are shown in Table 1.
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