Tower top gas phase separating, conveying and recycling system of chemical vacuum tower

The utility model relates to a tower top gas phase separating, conveying and recycling system of a chemical vacuum tower. Comprising a heavy pressure reduction tower top gas phase pipeline, a heavy pressure reduction first-stage ejector, a heavy pressure reduction second-stage ejector, a light pressure reduction tower top gas phase pipeline, a light pressure reduction first-stage ejector, a first-stage condenser, a light pressure reduction second-stage ejector, a second-stage condenser, a water separation tank, a steam pipeline, a vacuum device and a chemical furnace, the first-stage heavy pressure reduction ejector is connected to the second-stage heavy pressure reduction ejector through a pipeline, the first-stage condenser is connected to the second-stage light pressure reduction ejector through a pipeline, the second-stage light pressure reduction ejector is connected to the second-stage condenser through a pipeline, and the first-stage condenser and the second-stage condenser are both connected to the wa