Solid superstrong acid catalyst of esterification of preparation thereof
A technology of solid superacid and esterification reaction, which is applied in the direction of physical/chemical process catalyst, carboxylate preparation, chemical instruments and methods, etc. It can solve the problems of large amount of esterification reaction catalyst, high cost, and harsh preparation conditions. Achieve the effects of easy control of preparation conditions, extended life, and convenient preparation conditions
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Embodiment 1
[0019] Catalyst preparation
[0020] Stir and mix the two salt solutions with the atomic ratio of Ti and Al of 1:0.3 (the molar content of Al is 23%) at room temperature, and use NH 3 ·H 2 O to adjust the pH of the solution to 10, age for 8 hours, filter and wash with suction, dry at 383-413K for 15-24 hours, and grind to ≤200 mesh. Then use 0.1mol·L -1 Tm(NO 3 ) 3 Solution according to 15ml·g -1 The ratio of reflux state impregnated 2h, with 0.5mol L -1 H 2 SO 4 Solution according to 10ml·g -1 Immerse for 20min, dry at 393K for 3h, bake at 653K for 5h in an air atmosphere, and store in a desiccator.
[0021] Catalytic synthesis of TOPM
[0022] Weigh 0.1 g (accounting for 1.8% of the average anhydride weight) of the catalyst, weigh 5.5 g of pyromellitic anhydride, and weigh 27 ml of isooctyl alcohol into a three-necked flask. Insert a thermometer, a reflux condenser, and a water separator into the three-necked flask, start timing from the beginning of reflux, and the...
Embodiment 2
[0024] Catalyst preparation
[0025] Stir and mix the two salt solutions with the atomic ratio of Ti and Al of 1:0.7 (the molar content of Al is 41.2%) at room temperature, and use NH 3 ·H 2 O to adjust the pH of the solution to 6, age for 8 hours, filter and wash with suction, dry at 383-393K for 24 hours, grind to ≤200 mesh, and then use 0.2mol·L -1 Tm(NO 3 ) 3 Solution according to 15ml·g -1 After impregnating for 50min in the reflux state, use 0.5mol·L -1 H 2 SO 4 Solution according to 10ml·g -1 Immerse in the ratio of 20min, dry at 393K for 2h, grind to ≤200 mesh, bake at 773K for 5h in air atmosphere, and store in a desiccator.
[0026] Catalytic synthesis of TOPM
[0027] The esterification reaction was carried out according to the method of Example 1, the reaction temperature was 169-185° C., and the reaction yield was 99.3%.
Embodiment 3
[0029] At room temperature, stir and mix the two salt solutions with the atomic ratio of Ti and Al of 1:1 (the molar content of Al is 50%) and mix them evenly with NH 3 ·H 2 O to adjust the pH value of the solution to 8, age for 6 hours, filter and wash with suction, dry at 383K for 24 hours, grind to ≤200 mesh, and then use 0.2mol·L -1 La(NO 3 ) 3 Solution according to 15ml·g -1 After immersing in the reflux state for 20min, use 0.1mol·L H 2 SO 4 The solution was impregnated at a ratio of 10ml·g for 25min, dried at 393K for 1h, ground to ≤200 mesh, calcined at 873K for 5h in an air atmosphere, and then stored in a desiccator.
[0030] Catalytic synthesis of TOPM
[0031] Esterification is carried out according to the method of example 1, and reaction temperature is 165~189 ℃, and reaction yield is 98.0%
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