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Optimization of Heterogeneous Batch Extractive Distillation

Barreto, Alien Arias and Rodriguez-Donis, Ivonne and Gerbaud, Vincent and Joulia, Xavier Optimization of Heterogeneous Batch Extractive Distillation. (2011) Industrial & Engineering Chemistry Research, 50 . ISSN 0888-5885

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Official URL: http://dx.doi.org/10.1021/ie101965f

Abstract

Heterogeneous extractive batch distillation of the chloroform – methanol minimum boiling temperature azeotropic mixture is studied with water as a heterogeneous entrainer. The continuous feeding of water allows recovering 99%molar chloroform after condensation of the saddle binary heteroazeotrope water –chloroform. Unlike a homogeneous process, the reflux composition is different from the heteroazeotrope water – chloroform in the vapor overhead. Besides, the distillate recovery is improved by refluxing a portion a of the chloroform-rich distillate phase along with the water-rich entrainer phase. A genetic algorithm is coupled to a constant molar overflow model to study seven operation policies. Optimization parameters are the entrainer flowrate FE/V, the portion aT3 of distillate-rich phase refluxed to the column during chloroform distillation, the reflux policy RT5 during methanol distillation. The optimization maximizes a profit function, penalized with recovery yields constraints whereas purity targets are used as Task ending events. All optimized solutions achieve higher than 90%molar recovery yield and 99%molar purity for both products chloroform and methanol. Results are confirmed by rigorous simulation showing the good performance of coupling simplified model and genetic algorithm as a first approach. The two piece-wise parameter values operation policies for all three parameters increases profit by 41.8% and reduces total time by 43.8% compared to single value parameter policy. The parameter influence study ranks RT5 first, aT3 second and FE/V last. Keeping FE/V constant and using two piece-wise aT3 and RT5 value operation is recommended to increase profit.

Item Type:Article
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
Other partners > Instituto Superior de Tecnologias y Ciencias Aplicadas - InSTEC (CUBA)
Laboratory name:
Laboratoire de Génie Chimique - LGC (Toulouse, France) - Procédés Systèmes Industriels (PSI) - Analyse fonctionnelle des Procédés
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Deposited By: Vincent GERBAUD

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