期刊
POLYMERS
卷 13, 期 1, 页码 -出版社
MDPI
DOI: 10.3390/polym13010093
关键词
pervaporation; Arrhenius; simulation; modeling; PDMS membrane; bioethanol
资金
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq) [140376/2013-5, 1414922015-5]
- Fundo de Apoio ao Ensino, a Pesquisa e Extensao (FAEPEX) UNICAMP [0754/2014]
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [2008/57 873-8, 2015/20630-4]
The study demonstrates the experimental ethanol recovery by pervaporation and the development of a semi-empirical model for partial fluxes, showing the effect of temperature and composition of the feed on separation efficiency. The model exhibits a modified Arrhenius-type behavior that accurately calculates partial-permeate fluxes, demonstrating versatility in various processes such as ethanol recovery and dehydration.
High energy demand, competitive fuel prices and the need for environmentally friendly processes have led to the constant development of the alcohol industry. Pervaporation is seen as a separation process, with low energy consumption, which has a high potential for application in the fermentation and dehydration of ethanol. This work presents the experimental ethanol recovery by pervaporation and the semi-empirical model of partial fluxes. Total permeate fluxes between 15.6-68.6 mol m(-2) h(-1) (289-1565 g m(-2) h(-1)), separation factor between 3.4-6.4 and ethanol molar fraction between 16-171 mM (4-35 wt%) were obtained using ethanol feed concentrations between 4-37 mM (1-9 wt%), temperature between 34-50 degrees C and commercial polydimethylsiloxane (PDMS) membrane. From the experimental data a semi-empirical model describing the behavior of partial-permeate fluxes was developed considering the effect of both the temperature and the composition of the feed, and the behavior of the apparent activation energy. Therefore, the model obtained shows a modified Arrhenius-type behavior that calculates with high precision the partial-permeate fluxes. Furthermore, the versatility of the model was demonstrated in process such as ethanol recovery and both ethanol and butanol dehydration.
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