The invention relates to a process
system and method for refining an extraction
solvent dimethylformamide of a C5 separation device. The process
system comprises the following steps: a
solvent regeneration kettle carries out decoking treatment on the fed
solvent dimethylformamide needing to be refined, and the decoked material is extracted from a
gas phase, is condensed by a first condenser and then enters a crude solvent tank; conveying the crude solvent to a
solvent refining tower by a crude solvent pump; the
solvent refining tower, the second condenser, the
reflux tank and the
reflux pump of the
solvent refining tower form a circulation loop, the solvent refining tower carries out reduced pressure rectification operation on a material subjected to
coke removal, the material subjected to reduced pressure rectification is extracted from a
gas phase and enters the
reflux tank after being condensed by the second condenser, and azeotropic rectification is carried out by taking water as reflux liquid;
hydrolysis inhibitor
hydrocarbon substances are added into water and intermittently extracted from the tower top through azeotropy, materials subjected to azeotropic rectification are conveyed back to the solvent refining tower through a reflux pump of the solvent refining tower, and after multiple cycles, a tower kettle pump of the solvent refining tower is used for pumping out a refining solvent
dimethylformamide, and a tower top extraction pump of the solvent refining tower is used for pumping out impurities.