Fig. 1 is the structural representation of the utility model alpa-acetyl-gama-butyl ester synthesis device. In the figure, 1, the reaction kettle, 2, the condenser, 3, the upper tank, 4, the first pump, 5, the extraction kettle, 6, the second pump, 7, the rectifying tower, 8, the valve.
The ratio of γ-butyrolactone and methyl acetate of 1:1.5-1.8 is added into the reactor 1, and the 30% sodium methoxide liquid equivalent to 3 equivalents of γ-butyrolactone is pumped into the upper tank 3 through a pump, Start stirring, pass the steam into the heating jacket of the reaction kettle 1 and start heating, when heated to the beginning of reflux, start to drip the sodium methoxide liquid, adjust the steam amount and the speed of dripping so that the reaction is maintained at the temperature of micro-reflux, dripping. After adding, the heat preservation reaction is performed for 5-6 hours, the volatilized steam is cooled and refluxed into the reactor 1 through the condenser 2, and the uncooled gas enters the gas absorption device through the upper outlet of the condenser 2 to minimize the overflow of the waste gas. . After completion of the reaction, the sodium salt of alpa-acetyl-gama-butyl ester is obtained. The acetic acid solution is pumped into the upper tank 3, and the solution after the reaction in the reactor 1 is added dropwise by the upper tank 3, and the pH value of the adjustment solution is 5-6 to obtain the crude product of alpa-acetyl-gama-butyl ester. The crude product of the product is concentrated by distillation in the reactor 1, and a part of the excess solvent is removed. The obtained crude product is transferred to the extraction kettle 5 through the first pump 4, and the dichloromethane extractant is added to the extraction kettle 5, stirred for 1-2 h, and then the layers are statically separated, and the organic layer is transferred to the rectification distillation through the second pump 6. In the tower 7, the dichloromethane extractant is added again to the aqueous phase layer, so that the extraction is performed three times to reduce product loss, and the three extraction phases are combined to enter the rectifying tower rectification product, and other fractions obtained by rectification are passed through the liquid storage tank. Collect and recycle into production.