MIHAELA NEAGU (PETRE), DIANA CURSARU BIOETHANOL DEHYDRATION BY EXTRACTIVE DISTILLATION WITH PROPYLENE GLYCOL ENTRAINER A PRELIMINARY CASE STUDY
The purpose of the paper is to evaluate the selection criteria of entrainers for bioethanol dehydration by extractive distillation process. The entrainer candidate is propylene glycol (1,2 propanediol). This entrainer provide slightly lower selectivity and capacity compared to well known entrainers such as ethylene glycol or glycerol. The minimum number of theoretical stages and minimum reflux ratio for extractive distillation column were estimated based on pseudo-binary equilibrium curves on entrainer-free base, also. Despite of some unfavorable characteristics, the propylene glycol is safety and environmentally friendly, compared to the ethylene glycol, which is considerably toxic moreover, propylene glycol is a renewable product derived from bio-glycerol.