Heat-pump assisted distillation versus double-effect distillation for bioethanol recovery followed by pressure swing adsorption for bioethanol dehydration

A Coupling Process of Distillation with Vapor Permeation and Adsorption for Production of Fuel Ethanol: A Comparative Analysis on Energy Consumption

“…Since the multieffect distillation technique was applied, the total heat consumption in the three-column distillation was only 3748 kW, so there was a 52.9% heat saving. Compared with an energy consumption of 4908 kW in the conventional three-column configuration of extractive distillation without any heat integration process, , energy consumption could be saved by 18.7% under the same feed characterization, a feed flow of 1694.24 kmol h –1 with ethanol mole fraction of 5%. Similarly, the energy efficiency could be also promoted by process intensification with heat integration, where at least 20% of energy consumption could be saved.…”

“…For instance, to overcome the disadvantage of the moderate permeation flux of the tubular NaA zeolite membrane, a four-channel alumina hollow fiber was developed in our group to replace the tubular support for the growth of the membrane layer. The obtained hollow fiber supported NaA zeolite membrane not only exhibited ultrahigh permeation fluxes of 12.8 kg m –2 h –1 and a separation factor of >10000, but also significantly promoted packing densities by several folds in the membrane module, thereby permitting a much lower facility investment. − Apart from the optimization of the membrane performance alone, the dehydration solution could be also explored by combining the membrane process with other separation techniques. , This not only avoids membrane contamination but also reduces energy consumption. , To produce the anhydrous ethanol, the VP unit could be combined with distillation to accomplish the separation task by balancing the operation parameters between the two units. − The industrial combination of the vapor permeation of NaA zeolite membrane and distillation has been successfully achieved. − For instance, Harvianto et al proposed the advantages of a cost-effective unit using a coupling distillation-VP unit for isopropyl alcohol (IPA) dehydration, while in our previous work, it was found that the placement of the NaA membrane unit could enhance the operation flexibility of the column.…”

Recovery of Biomass-Derived Polyols by Pressure Swing Adsorption: Experiments, Simulations, Scale-up Implementation and Economic Analysis

“…On the other hand, the investment for the distillation unit was mainly for the column shell, packings, column intervals, heat exchangers, and pumps, and energy was consumed by the heat exchangers and pumps. The energy and equipment costs in the distillation and adsorption processes could be estimated by methods obtained from reported studies about economic analysis of distillation − and adsorption, ,− respectively, for which the exchangers were in the form of shell and tube, all of the equipment was carbon steel, the heat medium was saturated vapor, and cooling water was used as a refrigerant. It was assumed that a plant operates for 8000 h in a year.…”

Energy-efficient bioethanol recovery process using deep eutectic solvent as entrainer

“…The recovery of ethanol from bioethanol involves removing approximately 90% of the water from the feedstock. Various techniques can be implemented for ethanol-only recovery from low-ethanolcontent water mixtures, including membrane distillation [7,8], supercritical extraction [9,10], hybrid extraction/distillation [11][12][13], pressure swing adsorption [14][15][16], direct gasohol production [17], and extractive distillation [18][19][20].…”