Device for recovering light components in high-boiling substances during rectification process

The utility model relates to a device for recovering light components in high-boiling substances during a rectification process and belongs to the field of fine chemicals. The bottom of a gasification chamber is connected with the top of a heating portion through a flange, the heating portion is composed of a large casing and small casings, the large casing is arranged at the center, the small casings are arranged on two sides of the large casing, tube nests are arranged in annular gaps between casings, tube plates are arranged at the ends of the tube nests and the large and small casings, a feed automatic control device is connected with the heating portion, and a liquid level automatic control device is connected with the gasification chamber and the heating portion respectively. The device has the advantages that volatile light components are recovered from high-viscosity heavy components at the bottom of a rectification column, rectification gases are purified simultaneously, consumption of raw materials