Patent ID: 11970445
Assignee: LG CHEM, LTD.
Field: Chemical engineering (Chemistry)
Classification: CPC C  B | IPC B  C

Claim 13:
14. An apparatus for recovering an amide-based compound, comprising a distillation column equipped with a dividing wall,
wherein the distillation column is divided into a column top region and a column bottom region in which the dividing wall is not located, and a middle region in which the dividing wall is located, and the middle region is divided into an extraction region and a distillation region divided by the dividing wall,
wherein the extraction region comprises at least one feed port for introducing a mixed solution containing water and an amide-based compound and an extraction solvent, wherein the feed port of the extraction region is located at 2% to 98% of the number of theoretical plates calculated based on the column top region of the distillation column, and at least one first outflow port for discharging liquid/liquid separated solution containing water, and
an outflow port on the distillation region side and comprises at least one second outflow port for discharging separated solution of an upper stream containing an extraction solvent, at least one third outflow port for discharging separated solution of a middle stream containing water, and at least one fourth outflow port for discharging separated solution of a lower stream containing an amide-based compound.