Method for synthesizing methyl acrylate
A technology of methyl acrylate and synthesis method, applied in the preparation of carboxylate, chemical instruments and methods, preparation of organic compounds, etc., can solve the problems of low product yield, easy deactivation of catalysts, etc.
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Embodiment 1
[0034] 1,4-dioxane as solvent, paraformaldehyde and methyl acetate as raw materials, the reaction raw material gas with a solid-liquid ratio of 0.3:1:1 is passed through the reactor with catalyst A, and the reaction temperature is 300°C , 320°C, 340°C, 360°C, 380°C, 400°C. The reaction pressure is 0.4 MPa, and the reaction time is 100 h. The reaction results are shown in Table 1:
[0035] Table 1 Effect of reaction temperature on the selectivity of methyl acrylate with paraformaldehyde as raw material
[0036]
[0037]It can be seen from the above table that with the increase of the reaction temperature, the conversion rate of the raw material methyl acetate gradually increases, and when the temperature reaches 400°C, the conversion rate of methyl acetate reaches a maximum of 99.96%. The selectivity of the product methyl acrylate increases first and then decreases with the increase of temperature. When the reaction temperature was 340°C, the conversion rate of the raw ma...
Embodiment 2
[0039] Use 1,4-dioxane as solvent, tetramethylene and methyl acetate as raw materials, and the reaction raw material gas with a solid-liquid ratio of 0.3:1:1 passes through the reactor with catalyst A, and the reaction temperature is 300°C , 320°C, 340°C, 360°C, 380°C, 400°C. The reaction pressure is 0.4 MPa, and the reaction time is 100 h. The reaction results are shown in Table 2:
[0040] Table 2 The effect of reaction temperature on the selectivity of methyl acrylate when polyoxymethylene is used as raw material
[0041]
[0042] It can be seen from the above table that with the increase of the reaction temperature, the conversion rate of the raw material methyl acetate gradually increases, and when the temperature reaches 400°C, the conversion rate of methyl acetate reaches a maximum of 99.95%. The selectivity of the product methyl acrylate increases first and then decreases with the increase of temperature. When the reaction temperature was 340°C, the conversion ra...
Embodiment 3
[0044] Use 1,4-dioxane as a solvent, paraformaldehyde and methyl acetate as raw materials, and the reaction raw material gas with a solid-liquid ratio of 0.3:1:1 passes through the reactor with catalyst A, and the reaction pressure is 0.2 , 0.4, 0.6, 0.8, 1.0, 1.2 MPa. The reaction temperature was 340°C, and the reaction time was 100 h. The reaction results are shown in Table 3:
[0045] Table 3 Effect of reaction pressure on the selectivity of methyl acrylate with paraformaldehyde as raw material
[0046]
[0047] It can be found from the above table that with the increase of reaction pressure, the conversion rate of methyl acetate increases, and the selectivity of product methyl acrylate increases first and tends to be stable. When the reaction pressure reaches 0.4 MPa, the conversion rate of methyl acetate reaches 97.62%. When the methyl acrylate selectivity can reach 91.21%.
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