Optimization of heterogeneous batch extractive distillation / Alien Arias Barreto in Industrial & engineering chemistry research, Vol. 50 N° 9 (Mai 2011)  

Optimization of heterogeneous batch extractive distillation [texte imprimé] / Alien Arias Barreto, Auteur ; Ivonne Rodriguez-Donis, Auteur ; Vincent Gerbaud, Auteur . - 2011 . - pp. 5204–5217.
Chimie industrielle
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 50 N° 9 (Mai 2011) . - pp. 5204–5217

Mots-clés :	Optimization
Résumé :	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 recovery of 99 mol % 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 α 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 flow rate FE/V, the portion αT3 of the distillate-rich phase refluxed to the column during chloroform distillation, and the reflux policy RT5 during methanol distillation. The optimization maximizes a profit function, penalized with recovery yield constraints, whereas purity targets are used as task ending events. All optimized solutions achieve higher than 90 mol % recovery yields and 99 mol % purity for both products chloroform and methanol. The results are confirmed by rigorous simulation showing the good performance of coupling a simplified model and a genetic algorithm as a first approach. The two-piece-wise parameter value operation policies for all three parameters increase profit by 41.8% and reduce total time by 43.8% compared to the single value parameter policy. The parameter influence study ranks RT5 first, αT3 second, and FE/V last. Keeping FE/V constant and using the two-piece-wise αT3 and RT5 value operation is recommended to increase profit.
DEWEY :	660
ISSN :	0888-5885
En ligne :	http://pubs.acs.org/doi/abs/10.1021/ie101965f