Method for preparing acrylic acid through dehydration and oxidization of glycerin in one-step method
A technology of acrylic acid and glycerin aqueous solution, which is applied in the field of catalytic chemistry to achieve the effects of mild reaction conditions, simple separation, and reproducible equipment corrosion.
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Embodiment 1
[0019] Take 0.01 mol of ammonium metavanadate and 0.01 mol of ammonium tetramolybdate, mix and dissolve, and maintain a constant temperature of 90 °C until the solid is completely dissolved and condensed by evaporation to form a powder. The evaporated powder was dried in an oven at 150 °C for 4 h, and then calcined at 550 °C for 2 h. The calcined powder was compressed, crushed, and sieved into 20-40 mesh particles. The atomic ratio of molybdenum and vanadium in the prepared molybdenum vanadium composite oxide is 4:1, and the catalyst is named Mo / V=4:1.
[0020] 5 mL of catalyst was loaded into the fixed-bed continuous flow reaction device, and the raw glycerin aqueous solution was continuously sent into the reactor with a non-pulse metering pump. The speed is 0.5 h ?1 , the reaction results are shown in Table 1.
[0021] Table 1
[0022] Reaction time / h Glycerin conversion rate / % Acrylic acid selectivity / % Acrolein selectivity / % 4 97.9 25.4 46.0 8...
Embodiment 2-5
[0024] The catalyst and reaction conditions were the same as in Example 1, only the reaction temperature was changed, and the reaction time was 4 h. The reaction results are shown in Table 2.
[0025] Table 2
[0026] Example Reaction temperature / ℃ Glycerin conversion rate / % Acrylic acid selectivity / % Acrolein selectivity / % 2 200 92.3 20.1 20.2 3 250 96.1 28.9 39.4 4 350 97.5 29.5 35.6 5 400 100 27.7 30.1
Embodiment 6-7
[0028] The catalyst and reaction conditions were the same as in Example 1, only the liquid hourly space velocity was changed, and the reaction time was 4 h. The reaction results are shown in Table 3.
[0029] table 3
[0030] Example Liquid hourly space velocity / h -1 Glycerin conversion rate / % Acrylic acid selectivity / % Acrolein selectivity / % 6 10.8 95.9 21.1 47.2 7 20.0 91.1 18.9 35.6
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