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Chemcial Industry and Engineering 2015, Vol. 32 Issue (4) :50-55    DOI: 10.13353/j.issn.1004.9533.2015.04.010
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Two-Phase and Three-Phase Azeotropic Distillation Investigation in Ethanol Dehydration Column
Han Zhenwei1,2, Fan Yongmei1,2, Liu Tong1,2
1. School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China;
2. National Engineering and Research Center of Distillation Technology, Tianjin 300072, China

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Abstract 

In this paper, two-phase azeotropic distillation and VLL three-phase azeotropic distillation process in ethanol dehydration tower were studied. Distillation curves, entrainer concentration distribution, reflux flow and energy consumption of ethanol dehydration tower in four conditions were analyzed and compared by Aspen plus simulation software. The results reveal that distillation curves, entrainer concentration distribution, reflux flow and energy consumption are about the same for two-phase and VLL three-phase azeotropic dehydration column when benzene is selected as the entrainer, meanwhile, the distillation curves stride over the distillation boundary, and the entrainer concentration on most trays remains high. However when cyclohexane is selected as the entrainer, distillation curves, entrainer concentration distribution, reflux flow and energy consumption are quite different in VLL three-phase azeotropic distillation from those in two-phase azeotropic distillation cases in the dehydration column. In the case of VLL three-phase azeotropic distillation, cyclohexane has a relatively high concentration on most trays and plays a good role as a dehydrating agent; but in the two-phase azeotropic dehydration column,entrainer only exists on a few trays at the top of the tower, and does not contribute to azeotropic distillation process on most trays.

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Han Zhenwei
Fan Yongmei
Liu Tong
KeywordsAspen;   two-phase azeotropic distillation;   VLL three-phase azeotropic distillation     
Received 2013-05-09;
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Han Zhenwei, Fan Yongmei, Liu Tong.Two-Phase and Three-Phase Azeotropic Distillation Investigation in Ethanol Dehydration Column[J]  Chemcial Industry and Engineering, 2015,V32(4): 50-55
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