Distillation column for recovering vapor from aqueous solution, especially alcohol-containing fermentation solution, has rectification plates with back-flow device separate from steam outlet

摘要

In a distillation column for recovering vapor (especially alcohol vapor) from an aqueous solution using steam in a countercurrent process, having rectification plates with a back-flow device for the aqueous solution, the back-flow device (5) is separate from a steam outlet (7.1, 7.2) in at least one of the rectification plates (2.1, 2.2, 2.3).