Journal of South China University of Technology (Natural Science Edition) ›› 2010, Vol. 38 ›› Issue (8): 40-44.doi: 10.3969/j.issn.1000-565X.2010.08.008

• Chemistry & Chemical Engineering • Previous Articles     Next Articles

Exergy Analysis of Extractive Distillation for Fuel Ethanol

Yang Hui  Chen Li  Yan Zong-cheng  Wang Hong-lin   

  1. School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, Guangdong, China
  • Received:2009-09-03 Revised:2009-12-04 Online:2010-08-25 Published:2010-08-25
  • Contact: 杨慧（1984-），女，博士生，主要从事可再生资源理论与应用研究． E-mail:yanghui198410@yahoo．cn
  • About author:杨慧（1984-），女，博士生，主要从事可再生资源理论与应用研究．
  • Supported by:

    广东省科技计划项目（2002C20809,2004850101001,2006A50102002）;科技部中泰科技合作项目（18-509J）

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Abstract:

In order to effectively produce fuel ethanol with low energy consumption, four columns of extractive distillation for fuel ethanol are analyzed by the exergy method. It is found that （ 1 ） the exergy efficiency of the prefractionator increases from 33.3% to 61.0% when the top pressure varies from 101. 325 kPa to 50 kPa and the feed is preheated by waste water in the bottom instead of by water vapor; （2） the exergy efficiency of the distillation column increases from 1.6% to 64. 0% when the top pressure improves from 101. 325kPa to 200kPa; （3） the exergy efficiency of the extractive distillation column increases from 25.0% to 29.0% after the addition of KAc in the extractant glycol; and （4） the exergy efficiency of the extractant recovery tower is up to 25.9%. All this demonstrates that exergy analysis is feasible in distinguishing the position of high energy consumption in an extractive distillation system.

Key words: fuel ethanol, extractive distillation, exergy, exergy analysis