Method for continuously purifying crude glycolide

The invention relates to a method for continuously purifying crude glycolide, which comprises the following steps: (1) adding liquid crude glycolide into a crystal generation kettle containing a washing solvent in a stirring state to form a crystal solution, and simultaneously cooling the crystal solution to-10 DEG C to 40 DEG C; (2) introducing the crystal solution into a pressurized rotary drum filter, feeding the crude glycolide crystals to a glycolide dryer after the crude glycolide crystals sequentially pass through a filtering area, a washing area, a drying area and a discharging area, washing the glycolide crystals with a lean solvent in the washing area, and feeding a rich solvent discharged from the filtering area to a solvent recovery unit; and (3) drying the glycolide in a glycolide dryer to obtain purified glycolide. Compared with the prior art, on the premise that the operation process is simple and energy consumption is reduced, purified glycolide can be continuously produced on a large scale, a