Butadiene oligomerization reaction solvent recovery process and system

The invention discloses a butadiene oligomerization solvent recovery process and system, and in the process, after a to-be-purified material from butadiene oligomerization is rectified by a first rectifying tower, a first mixture is extracted from the tower top, and a second mixture is extracted from the tower kettle. After the second mixture is rectified through a second rectifying tower, a third mixture is extracted from the tower top, the third compound is subjected to segregation treatment to obtain a gas-phase fourth mixture and a liquid-phase fifth mixture, after the fourth mixture is rectified through a third rectifying tower, the solvent is extracted from the tower top, and a seventh mixture is extracted from the tower kettle; and extracting a sixth mixture from the tower kettle of the second rectifying tower, rectifying the sixth mixture in a fourth rectifying tower, extracting CDT from the tower top, and extracting heavy components from the tower kettle. According to the method, water and butadiene