| 摘要 |
A distillation process for recovering concentrated ethanol from an aqueous fermentate comprises fractionation of components of the aqueous fermentate under reduced pressure with vapor recompression and recovery of waste heat in a manner which obviates the need for substantial external sources of heat to operate the fractionation apparatus. The process includes a preliminary enrichment of the fermentate to separate volatile components, the enrichment also including recompression of a vapor phase and utilization of waste heat. The compression means used during enrichment and fractionation are run by engines which produce the recoverable waste heat. The utilization of vapor recompression and the use of waste heat to dry solid matter separated during the enrichment of the fermentate, for preheating the fermentate and for heating other process streams provides an energy efficient manner in which to recover ethanol from a fermentate.
|
