Method for synthesizing mesityl oxide and isophorone

[0027] Weigh 40g of magnesium aluminum hydrotalcite and 12g of 30% alkaline silica sol, mix them evenly, extrude into a strip, let stand in the air for 8 hours to obtain mixture I, dry in an oven at 150°C for 4h, and then roast at 450°C for 6h to obtain compound II, Compound II was hydrothermally treated at 180°C for 48 hours to obtain Compound III. After compound III was dried, it was calcined again at 450°C for 6 hours to obtain magnesium-aluminum composite oxide IV, which is the desired catalyst. The catalyst performance evaluation test was carried out on a fixed-bed tubular reactor (Ф25×500mm stainless steel), with a catalyst loading of 10ml, evaluation conditions: temperature 300°C, normal pressure, space velocity 0.5h -1 . Gas chromatographic analysis: selectivity of mesityl oxide is 35%, selectivity of isophorone is 36%, total effective selectivity is 71%.

[0029] Weigh 40g of magnesium aluminum hydrotalcite, 20g of 30% alkaline silica sol, mix them evenly, extrude into a strip, let stand in the air for 8 hours to obtain mixture I, dry in an oven at 150°C for 4h, and then roast at 450°C for 6h to obtain compound II, Compound II was hydrothermally treated at 180°C for 48 hours to obtain Compound III. After compound III was dried, it was calcined again at 450°C for 6 hours to obtain magnesium-aluminum composite oxide IV, which is the desired catalyst. The catalyst performance evaluation test was carried out on a fixed-bed tubular reactor (Ф25×500mm stainless steel), with a catalyst loading of 10ml, evaluation conditions: temperature 310°C, normal pressure, space velocity 1h -1 . Gas chromatography analysis: mesityl oxide selectivity 38%, isophorone selectivity 34%, total effective selectivity 72%.

[0031] Weigh 40g of magnesium aluminum hydrotalcite and 40g of 30% alkaline silica sol, mix them uniformly, extrude into a strip, let stand in the air for 8 hours to obtain mixture I, dry in an oven at 150°C for 6h, and then roast at 450°C for 8h to obtain compound II. Compound II was hydrothermally treated at 180°C for 48 hours to obtain Compound III, which was dried and calcined again at 450°C for 8 hours to obtain magnesium-aluminum composite oxide IV, which is the desired catalyst. The catalyst performance evaluation test was carried out on a fixed-bed tubular reactor (Ф25×500mm stainless steel), with a catalyst loading of 10ml, evaluation conditions: temperature 310°C, normal pressure, space velocity 0.5h -1 . Gas chromatographic analysis: the selectivity of mesityl oxide is 40%, the selectivity of isophorone is 33%, and the total effective selectivity is 73%.