Rectifying column backward flow controlling means

The utility model relates to a rectifying column backward flow controlling means, it includes condenser, rectifying column, separation chamber, the condenser setting on the top of rectifying column, the output intercommunication of rectifying column have separation chamber's input, output and separation chamber's the input of rectifying column between be provided with and take out the material pipe, the input of rectifying column be connected with separation chamber's output, separation chamber's inside be provided with the sensor, separation chamber's bottom surface intercommunication have the extraction pipe, separation chamber's the input of output and rectifying column between be provided with the sampler, separation chamber's up end be provided with the controller, the controller electricity be connected with sensor and a plurality of pump, the utility model has the advantages of simple structure, efficient, stable performance, the security is high, the function is practical.