Propylene oxide purification apparatus, and method for producing propylene oxide

摘要

The propylene oxide purification apparatus liquefies at least a portion of the flows supplied from the top outlet (20t) of the first distillation column (10), the second distillation column (20), and the second distillation column, and converts the gas phase into the liquid phase from the gaseous phase outlet (22g) The liquefaction separation equipment (LQ) for discharging from the liquid phase outlet (22o), the third distillation column (30), and the column top outlet (10t) of the first distillation column (10) and the inlet (20i) of the second distillation column (20) are connected. Line (LA), a line (LC) connecting the liquid phase outlet (22o) of the liquefaction separation facility (LQ) and the reflux inlet (20r) of the second distillation column (20), and the bottom outlet (20b) of the second distillation column (20) and a line LD connecting the inlet 30i of the third distillation column 30, and an extractive source, a line LA, a liquefaction separation facility LQ, a line LC, and a second distillation column 20 ) and a line LE connecting at least one selected from the group consisting of.