Method for intermittent preparing diisopropyl ester amber acid

This invention provides an intermittent method for preparing diisopropyl succinate. The method comprises: (1) adding succinic acid, isopropanol, catalyst and dehydrating agent into an esterification kettle with a rectification column with condenser and water separator at the top, esterifying, recovering dehydrating agent and excess isopropanol when there is no water from the water separator, and refining; (2) adding recovered dehydrating agent and excess isopropanol, and new succinic acid, isopropanol, catalyst and dehydrating agent into the reactor, and dropping front cut fraction; (3) refluxing, and esterifying; (4) recovering dehydrating agent and excess isopropanol; (5) refining crude ester to obtain diisopropyl succinate and front cut fraction. The method has such advantages as recoverable dehydrating agent and excess isopropanol, low energy consumption, low raw material consumption, short process, low investment, easy operation and stable product quality.