Production of pure ethanol from azeotropic solution by pressure swing adsorption |
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Authors: | Pit Pruksathorn and Tharapong Vitidsant |
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Affiliation: | (1) Department of Chemical Technology, Faculty of Science, Chulalongkorn University, Phayai Rd, Patumwan, Bangkok, 10330, Thailand |
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Abstract: | Pressure swing adsorption (PSA) is attractive for final separation in the process of water removal especially for fuel ethanol
production. Despite many researches on simulation and experimental works on adsorption of water on 3A zeolite in a fixed bed,
none have studied a process with the actual PSA system. The purpose of this research was to study the PSA process with two
adsorbers and effects of several parameters. The research also included analysis of kinetic and thermodynamic data of ethanol-water
adsorption on commercial 3A zeolites in a single fixed bed. A two-level factorial design experiment was used in this research
work to preliminarily screen the influence and interaction among the factors. Effects of important parameters such as initial
temperature, feed concentration and feed rate were investigated. It was proven that the Langmuir isotherm could best predict
the experimental results. In the PSA pilot test, the principal factors, which had effects on the performance, were feed rate,
feed concentration, adsorption pressure and the cycle time. Prediction of the process efficiency in terms of ethanol recovery
and enrichment was proposed in the form of regression models. The results of the study in a fixed bed adsorber could help
designing a pilot-scale PSA unit. The experiments proved to be successful in terms of producing high concentration ethanol
with high percentage of ethanol recovery. With further simulation work the process could be scaled up for an industrial use. |
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Keywords: | PSA Adsorption Separation 3A Zeolites |
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