Process method for synthesizing ethyl acetate
The technology of an ethyl acetate and a process method is applied in the field of synthesizing ethyl acetate through a transesterification route of methyl acetate raw materials, which can solve the problems of loss of active components, poor stability of heterogeneous catalysts, etc., and achieves low production energy consumption, simple craftsmanship
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[0038]Example 1
[0039]Such asfigure 1 As shown, the molar ratio of the raw material methyl acetate to ethanol is 3.5:1. After being evenly mixed, it is reacted for 2 h in a 1% homogeneous sodium ethoxide catalyst reactor. The mixed product is pumped to the reaction-rectification tower, Reaction-the rectification tower separates first and then continues to react. The top temperature of the rectification tower is 53.8 ℃, and the extracted components are 82% by mass methyl acetate and 18% methanol. Use Cu-ZnO-Al for methyl acetate-methanol azeotrope between 180-250℃2O3The catalyst undergoes hydrogenation reaction, and ethanol and methanol are obtained through simple separation. The ethanol is recycled to the reaction raw material, and methanol is a by-product with a purity higher than 99.9%. The reaction rectification tower still contains ethyl acetate with a content of more than 95%, methyl acetate with a content of about 4%, ethanol with a content of less than 1%, and a very small amo...
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[0040]Example 2
[0041]Such asfigure 2As shown, the molar ratio of raw material methyl acetate and ethanol is 1:4, and after mixing uniformly, it passes through a MgO fixed-bed pre-reactor prepared by the precipitation method of excess sodium carbonate. The mixed product is pumped to the reaction-rectification tower, and the reaction- The rectification tower is filled with the formed solid MgO catalyst, and the reaction is continued after being separated in the reaction-rectification tower. The top temperature of the rectification tower is 53.8 ℃, and the extracted component is 82% by mass of methyl acetate and 18% of methanol. Use Cu-ZnO-Al for methyl acetate-methanol azeotrope between 180-250℃2O3Catalyst hydrogenation reaction, ethanol and methanol are obtained after rectification and separation, ethanol is recycled to the reaction raw material, methanol is a by-product, and the purity is higher than 99.9%. At this time, the mass composition of the reaction-rectification tower is ab...
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