Method for preparing acrylic acid/acrylate by adopting catalyst to catalyze condensation of acetic acid and methanol
A catalyst and acrylic acid technology, which is applied in the preparation of organic compounds, carboxylate salts, carboxylate esters, etc., can solve the problem of limited reserves of raw material propylene, and achieve good catalytic activity and stability
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[0018] Catalyst preparation:
[0019] Ag-VPO / SBA-15 catalyst was prepared by organic phase method: weigh NH 4 VO 3 0.8489g and H 2 C 2 o 4 2H 2 O 1.8287g in beaker A, then add deionized water to the beaker under the conditions of 50 ℃ water bath heating and magnetic stirring to dissolve, stir the solution until it turns green; take 2.1754g of phosphoric acid in beaker B, and then weigh 0.1427 Heat and dissolve g silver nitrate in beaker C to form a clear solution for use. Add the liquids in beakers A and B to SBA-15 in turn, wash beakers A and B with 20-40ml of water, and after the solution is completely added to the carrier, stir evenly, then add the prepared silver nitrate solution to the carrier, Stir once every half hour during 6 hours of immersion. After immersion, the sample is dried in a drying oven at 120°C. After drying, it is roasted at 500°C. The sample is pressed under a pressure of 10MPa and sieved into 20-40 mesh particles to make a catalyst. Recorded as ...
Embodiment 2
[0025] Same as Example 1, but the ratio of P / V / Ag in the catalyst was changed so that the P / V / Ag molar ratio was 2.2 / 1 / 0.3, and the obtained results are shown in Table 2. As can be seen from Table 2, Ag-VPO / SBA-15 with a P / V / Ag molar ratio of 2.2 / 1 / 0.3 was selected as the catalyst. When the reaction temperature was 400°C, the conversion rate of acetic acid was 71.9%. The selectivity of methyl acrylate is 22.9%, and the selectivity of methyl acrylate is 21.5%. With the increase of reaction temperature, the conversion of acetic acid, the selectivity of acrylic acid and methyl acrylate gradually increased.
[0026] Table 2.Ag-VPO / SBA-15 (P / V / Ag=2.2 / 1 / 0.3) catalyzed methanol acetate to prepare acrylic acid result table
[0027]
[0028]
Embodiment 3
[0030] Same as Example 1, but the ratio of P / V / Ag in the catalyst was changed so that the P / V / Ag molar ratio was 2.2 / 1 / 0, and the obtained results are shown in Table 3. As can be seen from Table 3, Ag-VPO / SBA-15 with a P / V / Ag molar ratio of 2.2 / 1 / 0.0 was selected as the catalyst. When the reaction temperature was 400°C, the conversion rate of acetic acid was 31.5%. The selectivity of methyl acrylate is 13.5%, and the selectivity of methyl acrylate is 10.3%. With the increase of reaction temperature, the conversion of acetic acid, the selectivity of acrylic acid and methyl acrylate gradually increased. Compared with Examples 1 and 2, the presence of component Ag in the catalyst improves the conversion rate of acetic acid and methanol, and is beneficial to the generation of acrylic acid and methyl acrylate. With the increase of Ag content in the Ag-VPO / SBA-15 catalyst, the conversion rate of acetic acid increased gradually.
[0031] Table 3.Ag-VPO / SBA-15 (P / V / Ag=2.2 / 1 / 0) catal...
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