The ionic liquid 1-ethyl-3-methylimidazolium dicyanamide, [C2mim]N(CN)2 is a suitable solvent for the extractive distillation of ethanol/water mixtures. This IL has comparable relative ethanol/water volatility as the benchmark solvent ethylene glycol (EG). Pilot plant experiments with both EG and [C2mim]N(CN)2 as solvent proved that the developed model for the extractive distillation of ethanol/water could well describe the experimental results. The achieved purity of the ethanol in the pilot plant using [C2mim]N(CN)2 as solvent was 99.91%. A conceptual process was designed for both the benchmark solvent EG and the IL. The process with the IL as solvent required 11% more energy than that with EG as solvent. However, if heat integration is implemented, the extractive distillation with the IL requires 16% less energy than the EG-based process. The key performance points for extractive distillation of ethanol/water mixtures are the recovery of the ionic liquid and the heat integration.
|Title of host publication||Ionic Liquids : Science and Applications|
|Editors||A.E. Visser, N.J. Bridges, R.D. Rogers|
|Place of Publication||Washington D.C.|
|Publisher||American Chemical Society|
|Publication status||Published - 2012|
|Name||ACS Symposium Series|
Meindersma, G. W., Quijada-Maldonado, E., Aelmans, T. A. M., Gutierrez, J. P., & Haan, de, A. B. (2012). Ionic liquids in extractive distillation of ethanol/water : from laboratory to pilot plant. In A. E. Visser, N. J. Bridges, & R. D. Rogers (Eds.), Ionic Liquids : Science and Applications (pp. 239-257). (ACS Symposium Series; Vol. 1117). American Chemical Society. https://doi.org/10.1021/bk-2012-1117.ch011