| abstract |
The invention provides a preparation method of 1-cyano-2-propenyl acetate, which comprises esterification reaction and distillation, wherein acrolein cyanohydrin and liquid acetic anhydride are subjected to esterification reaction in the presence of a catalyst and inorganic acid to prepare reaction liquid containing ACA, and an ACA product is obtained after distillation, and the esterification reaction also comprises introducing gaseous acetic anhydride into a reaction system; the invention also provides a preparation device of the 1-cyano-2-propenyl acetate, the method and the device skillfully divide the acetic anhydride into two parts for feeding, and the separated part is taken as acetic anhydride steam and sent into the esterification reaction tower from the bottom of the tower, thereby not only providing the heat required by the reaction, but also effectively blowing off the acetic acid, effectively removing the acetic acid and accelerating the esterification reaction, and improving the reaction efficiency. The device is characterized in that a conductivity meter is arranged in the esterification reaction tower to monitor the reaction process on line, so as to ensure the timeliness and effectiveness of the control of the reaction process. |