November 2018

Separation of liquid mixtures, frequently by distillation, consumes large amounts of energy in the chemical and process industries. This project proposes to develop, test, and demonstrate a continuous-flow, scalable, nonthermal, nonequilibrium liquid separation for the test case of ethanol + water that uses ultrasound, and avoids the heat transfer losses and azeotropic bottleneck of distillation. The basis of the separation is straightforward. When ultrasound passes through a nominally quiescent liquid with a free surface above, droplets are produced and form a mist.

Biofuels produced from fermentation processes have long been processed using decades-old distillation technology. Distilling a minor component of this broth to a high purity requires substantial amounts of energy that can lessen the net-energy and profitability of the fuel produced. This work will demonstrate a new technology concept developed by Mattershift, LLC that uses a carbon nanotube (CNT) membrane to selectively extract the biofuel, in this case ethanol, from a fermentation broth.