The utility model discloses a pilot scale rectifier unit, bend and the fraction groove including reation kettle, rectifying column, condenser, respirator, U type, there is the rectifying column through fixed intercommunication between reation kettle and the condenser, is equipped with the stirring rake in the reation kettle, agitator motor is installed at the stirring rake top, the baiting valve is installed to reation kettle's bottom, the top of condenser is connected with respirator, fraction groove respectively, still install the condenser pipe between condenser and the fraction groove, the bottom of condenser pipe communicates to the U type curvedly, the curved junction of condenser pipe and U type is installed and to be swung funnel and control of reflux ratio ware, the control of reflux ratio ware still is equipped with solenoid with the junction of condenser pipe, the curved both ends of U type communicate with rectifying column and fraction groove respectively. The utility model discloses rational in infrastructure, with low costs, the effect is showing, and production efficiency is high.