The utility model relates to the technical field of
medicine extraction, in particular to an extraction device for preparing double-bond heterogeneous impurities of a
loratadine intermediate. The device comprises a mixing module, an extraction module, a separation module and a
control system, the mixing module, the extraction module and the separation module are sequentially connected, the
control system is in communication connection with the mixing module, the extraction module and the separation module, and the mixing module comprises a high-speed stirrer and a mixing cavity. The extraction module comprises an extraction
tower and a
distributor, the
distributor is mounted at the top of the extraction
tower, the separation module comprises a
centrifugal separator and a gravity
settling tank, the
control system comprises temperature sensors, a flow sensor and a PLC (
programmable logic controller), the temperature sensors are mounted in the mixing cavity and the extraction
tower, and the flow sensor is mounted in the gravity
settling tank. According to the utility model, the problems of reduction of extraction efficiency and incomplete
impurity separation caused by temperature fluctuation are avoided, so that the preparation quality and stability of the double-bond isomeric impurities of the
loratadine intermediate are improved.