Continuous production method of propyl acetate

The invention relates to a continuous production method of propyl acetate, and is characterized by comprising the following steps: adding ionic liquid dissolving inorganic compound of the Lewis acid into the glacial acetic acid and the normal propyl alcohol as the catalyst; heating the components in an esterification kettle for esterification reaction; adding the mixed raw material of the glacial acetic acid and the normal propyl alcohol with the same proportion into the esterification kettle continuously after the reaction begins to reflux; separating the propyl acetate generated in the reaction in an esterification tower, and sending the unreacted raw materials back to the esterification kettle from the bottom of the kettle to continue the reaction; steaming the water and part of the normal propyl alcohol from the tower top; after the cooling, refluxing one part of the steam to the tower top, and sending the other part of the steam to a stratifying device at the tower top; refluxing part of the aqueous phase at the lower layer to the esterification tower through a reflux ratio distributor, and recovering the other part of the aqueous phase; and sending the ester phase at the upper layer to the production purification stage for the further separation to obtain the propyl acetate product. The method of the invention has simple process, high esterification conversion rate, good product selectivity, recyclable catalyst, no device corrosion, environmental protection, simple synthesis method of the selected ionic liquid catalyst, and better solubility of the acid inorganic compound.