A method and plant for purifying ethylene carbonate

A plant for purifying ethylene carbonate from a crude ethylene carbonate composition, the plant comprising:

• at least one distillation column;
• and
• at least one crystallizer,
• the distillation column being a bottom dividing-wall distillation column, comprising a dividing wall connected with and extending from a bottom of the bottom dividing-wall distillation column upwards over a part of a height of the bottom dividing-wall distillation column to subdivide a bottom section of the dividing-wall distillation column, seen in cross-section of the dividing-wall distillation column, into a first bottom subsection and into a second bottom subsection, the bottom dividing-wall distillation column further comprising an inlet line for a crude composition containing ethylene carbonate, an overhead outlet line a bottom outlet line and a side outlet line,
• the at least one crystallizer comprising an inlet line for a pre-purified composition and an outlet line for purified ethylene carbonate composition, the side outlet line of the bottom dividing-wall distillation column being directly or indirectly connected with the inlet line for pre-purified composition of the at least one crystallizer.