The EDC from the oxychlorination process and the unconverted EDC from the cracking process are purified in the EDC distillation unit.
Water and low boiling components are removed in the dewatering column.
The dry bottom product from the dewatering column together with the unconverted EDC from the cracking process are separated from the high boiling components in the high boils and vacuum columns. The high boils are withdrawn from the bottom of the vacuum column and sent to the by-product recovery unit.
By default, the high-boil column is operated at elevated pressure and the overhead vapours of this column are used to heat the heads column and the vacuum column. Depending on customer’s requirements also other heat recovery options can be realized.