Session 3 Bioengineering research

Applied Biochemistry and Biotechnology

, Volume 20, Issue 1, pp 621-633

First online:

Computer simulation of the dartmouth process for separation of dilute Ethanol/Water mixtures

  • José L. TorresAffiliated withThayer School of Engineering, Dartmouth College
  • , Hans E. GrethleinAffiliated withThayer School of Engineering, Dartmouth College
  • , Lee R. LyndAffiliated withThayer School of Engineering, Dartmouth College

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High energy costs are associated with the recovery of ethanol from fermentation broths. This paper discusses a computer simulation of the Dartmouth Process, which aims to reduce these costs by the use of IHOSR distillation, extensive heat integration, and extractive distillation using a salt.

To resolve the uncertainty in modeling alcohol-water-salt vapor-liquid equilibrium, a new and more accurate activity coefficient model was used. An Aspen™ model was used to generate capital and energy costs for a range of ethanol concentrations in the feed. Simulation results show that the Dartmouth Process offers substantial economic advantages over benzene azeotropic distillation, particularly at low feed concentrations.

Index Entries

Ethanol separation activity coefficients computer simulation