Products of ethanol products

摘要

An improved method and apparatus are provided for recovery of high quality ethanol. Substantial energy savings are realized by utilizing a pair of analyzer columns in which overhead vapours from column operating at a higher pressure supplies the heat required for column operating at a lower pressure. The fermented wash is split into two portions of unequal sizes, the larger portion supplied to the higher pressure analyzer column and the smaller portion to the lower pressure analyzer column to achieve efficient primary distillation of ethanol followed by a series of distillation steps including dehydration leading to high quality ethanol products.