Refining method and device for n-propyl acetate esterification synthesis

• Main Authors: QING ZUSEN, GUO HAICHAO, YU CONGLI
• Format: Patent
• Language: English
• Published: 29.04.2015
• Subjects: ACYCLIC OR CARBOCYCLIC COMPOUNDS; CHEMISTRY; METALLURGY; ORGANIC CHEMISTRY

The invention relates to a refining method and device for n-propyl acetate esterification synthesis. The refining method comprises the following steps: feeding a crude product obtained in an n-propyl acetate reaction section into an esterification tower, performing preliminary separation on the n-propyl acetate in the esterification tower through a rectifying mode, and evaporating out raw ester consisting of the n-propyl acetate, water and part of n-propyl alcohol from the tower top of the esterification tower; after condensing the raw ester through a tower-top condenser, feeding the condensed raw ester into a tower-top layering machine for layering, refluxing a lower-layer water-phase part to an esterification tower, completely extracting and feeding an upper-layer organic phase into a pervaporation membrane separator to perform separation, so as to obtain dehydrated raw ester; enabling water and a little n-propyl acetate in a solution at a feed liquid side to penetrate through the pervaporation membrane in the form of steam, so as to obtain a penetrating fluid, and returning the penetrating fluid to tower-top layering machine of the esterification tower and discharging the layered penetrating fluid from the water phase; re-feeding the dehydrated raw ester into a refining tower to obtain a n-propyl acetate finished product. According to the refining method, the recovery rate is high, the process is simple, the safety coefficient is high, the feed liquid circulation volume is small, the operation energy consumption is low, and a third component is not added.