Retrofitting of extractive distillation columns with high flux, low separation factor membranes: A way to reduce the energy demand?
| Autor: | Giuseppe Genduso, E. Colombini, B. Van der Bruggen, Patricia Luis, Antonio Amelio, Jan Degrève |
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| Rok vydání: | 2016 |
| Předmět: |
Chromatography
General Chemical Engineering Methyl acetate Ethyl acetate 02 engineering and technology General Chemistry 021001 nanoscience & nanotechnology chemistry.chemical_compound Acetic acid Membrane 020401 chemical engineering chemistry Chemical engineering Azeotropic distillation Extractive distillation Pervaporation Methanol 0204 chemical engineering 0210 nano-technology |
| Zdroj: | Chemical Engineering Research and Design. 109:127-140 |
| ISSN: | 0263-8762 |
| DOI: | 10.1016/j.cherd.2016.01.013 |
| Popis: | In the context of the production of n-butyl acetate, acetic acid or ethyl acetate from methyl acetate, a pervaporation module was employed in order to retrofit the extractive distillation unit used to recover methyl acetate from a methanol/methyl acetate industrial waste stream. The PolyAl TypM1® membrane (from PolyAn™) was first tested using a wide feed concentration range (11–90 mol% methanol) and three temperatures (30, 36, 44 °C). Then, it was compared with other commercial membranes reported in literature (at 40–45 °C) at the methanol/methyl acetate azeotropic composition, resulting in a medium/low separation factor and with the highest flux. This ensured the simulation of a very challenging condition for the retrofitting from an energetic point of view (i.e., for moderate or low separation factor membranes: the higher the flux, the higher the process energy requirement). The retrofitting permits to avoid the use of a solvent during azeotropic separation. Moreover, during comparison of the retrofitted hybrid pervaporation-distillation unit with the source industrial extractive distillation unit, an overall energy saving up to ∼38% was demonstrated (∼23% when only the energy consumed by the heaters is taken into account). In addition, major hydraulic modifications could be avoided employing structured packing and membranes of higher separation factors. |
| Databáze: | OpenAIRE |
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