exchanged sepiolite has been studied.The product distribution indicates that the formation of diethylether and ethylene takes place by a series of consecutive and parallel reactions.A mechanism for the formation of both products has been derived by studying the influence of different operational variables on the reaction rates. www.minersoc.org
www.library.uow.edu.au
Dehydration of Ethanol: New Approach
Gives Positive Energy Balance
cobweb.ecn.purdue.edu
Simulation of Ethanol Extractive Distillation With a Glycols Mixture as Entrainer
Abstract. Extractive distillation is an alternative for alcohol dehydration processes that has shown to be more effective than azeotropic distillation and, in close proximity, to be very competitive against the process that uses molecular sieves. Glycols have shown be the most effective solvents in extractive distillation, mainly ethylene glycol and glycerol. In this work, an extractive distillation column was simulated with the ASPEN PLUS software platform, using the RadFrac module for distillation columns,to investigate the effect of the ethylene glycol and glycerol composition, the entrainer feed entry stages, the entrainer split stream feed,and the azeotropic feed temperature on the separation. The NRTL model was used to calculate the phase equilibrium of these strongly polar mixtures, and the thermodynamics of the system was verified by using the Aspen Split simulator to determine equilibrium diagrams. A rigorous simulation of the extractive
distillation column finally established was also performed, including a secondary recovery column for the mixture of solvents and recycle loop, to simulate an industrially relevant situation. This simulation allowed establishing complete parameters to dehydrate ethanol and more energetically efficient operating conditions for each one of the columns through a pinch analysis preliminary.
www.enpromer2005.eq.ufrj.br
