主权项 |
1. A process for refining ethanol from a dilute acid stream, comprising:
introducing the dilute acid stream to an inlet zone of a distillation column to yield an overhead comprising ethanol; recirculating an intermediate stream, withdrawn from a removal zone, by passing the intermediate stream through an intermediate reboiler and returning the intermediate stream to the distillation column at or adjacent to the removal zone to supply heat to the distillation column, heating the distillation column below the removal zone with a bottoms reboiler and withdrawing a residue therefrom, wherein the residue comprises water and substantially all of the acid from the dilute acid stream; and recovering an ethanol product from the overhead. |