Effect Of Vacuum Distillation On Extraction Of Cellulosic Ethanol

The development of today’s world economy is highly dependent on oil, global oil production is decreasing year by year, it is imminent to look for renewable energy. As a renewable energy, cellulosic ethanol increasingly attracted people’s attention, how to produce cellulosic ethanol with low energy and high efficient has become a bottleneck in the development of cellulosic ethanol industrialization, vacuum distillation extraction of cellulose ethanol makes cellulase recycling become possible, also improves concentration and yield of cellulosic ethanol, effectively reduce the cost of preparation of cellulosic ethanol.In this study, vacuum distillation experiments of ethanol and water was carried out firstly to debug distillation equipment, the optimal operating conditions of vacuum distillation process was obtained, which verified that it was feasible to extract cellulosic ethanol with vacuum distillation In the guarantee cellulose enzyme activity of the premise. The vacuum distillation experiment of the fermented mash was carried out based on vacuum distillation of ethanol and water system. The effect of operation pressure, reflux ratio, feed location on the distillation process of fermented system were studied on the conditions of the feed rate7L/h, the feed temperature25℃, the heating power1500W, the obtained optimum operating conditions as follows:operating pressure6.3kPa, the reflux ratio8.0, the first13plate feed, under this operating condition the cellulose enzyme recycling was possible, while allowing the distillation process to reduce energy consumption by about20%, the top ethanol concentration increased about47%, and the recovery rate increased about3%.Finally, the simulation of vacuum distillation process of ethanol-water system and fermented mash system were carried out using ASPEN PLUS process simulation software. The vapor-liquid equilibrium data for the ethanol-water system from ASPEN PLUS simulation are in good agreement with literature values at the atmospheric conditions, the simulation and the experimental values vary greatly under low-pressure conditions, thus using the vapor-liquid equilibrium data in the literature to revise binary interaction parameters of NRTL model in ASPEN PLUS, the obtained vapor-liquid equilibrium data using the revised NRTL model are in good agreement with literature values. The distillation process of fermented mash system was simulated with the revised NRTL model, simulation and experimental values are in good agreement, which provide guidance for future industrial scale and production adjustments.