It is a kind of to extract the method for being coupled with rectifying and realizing the dehydration of 2 picolines

The invention discloses a kind of method for extracting and being coupled with rectifying and realize the dehydration of 2 picolines, belong to purification organic high molecular compound technical field, it is characterised in that：Comprise the following steps：（1）Mixing：Dichloromethane is mixed with 2 picoline solutions to be drained off, mixed liquor is obtained, the mass ratio of dichloromethane and 2 picolines is 6~10 in mixed liquor：1；（2）Extraction split-phase：Mixed liquor is placed in carries out split-phase in phase-splitter, obtain water phase and organic phase, completes single extraction；（3）Split-phase is extracted again：Detecting step（2）In obtained water phase, if 2 picolines account for weight/mass percentage composition >=1% of water phase, add dichloromethane in Xiang Shuixiang, the mass ratio of dichloromethane and 2 picolines is 6~10：1, and perform step（2）With（3）；（4）Rectifying：By step（2）With（3）Middle gained organic phase carries out rectifying, top extraction extractant, 2 picolines of bottom extraction.The dewatering has good separating effect, low production cost, low power consumption and other advantages.