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Isopropyl alcohol recovery by heteroazeotropic batch distillation

Van Baelen, Guy and Vreysen, Steven and Gerbaud, Vincent and Rodríguez-Donis, Ivonne and Geens, Jeroen and Janssens, Bart Isopropyl alcohol recovery by heteroazeotropic batch distillation. (2010) In: European Meeting on Chemical Industry and Environment EMChiE 2010, 17-19 May 2010, Mechelen, Belgium .

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Solvent recovery is becoming a major issue in the pharmaceutical and specialty chemical industries. Solvent recovery by conventional batch distillation is limited by the frequent presence of azeotropes in the used solvent mixtures. Most distillation processes for the separation of azeotropic or difficult zeotropic mixtures involve the addition of an entrainer (homogeneous and heterogeneous azeotropic distillation or extractive distillation). In this study the recovery of IPA (isopropyl alcohol) from an industrial waste stream (IPA/water mixture) was studied by conventional batch distillation and heteroazeotropic batch distillation, using cyclohexane as entrainer. First the ternary IPA/water/cyclohexane azeotrope (boiling temperature of 64.1 °C), then the binary IPA/cyclohexane azeotrope (boiling temperature of 69.3°C) and finally pure IPA was distilled. 99.96 mass% IPA could be obtained by heteroazeotropic distillation, using cyclohexane as entrainer. By using this procedure the IPA recovery is 97.6%, which is high compared to the conventional distillation techniques. The binary azeotrope could be reused in a subsequent heteroazeotropic batch distillation.

Item Type:Conference or Workshop Item (UNSPECIFIED)
Audience (conference):International conference proceedings
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Other partners > Instituto Superior de Tecnologias y Ciencias Aplicadas - InSTEC (CUBA)
Other partners > Janssen Pharmaceutica (BELGIUM)
Other partners > Katholieke Universiteit Leuven - KU LEUVEN (BELGIUM)
Laboratory name:
Laboratoire de Génie Chimique - LGC (Toulouse, France) - Procédés Systèmes Industriels (PSI) - Analyse fonctionnelle des Procédés
Deposited On:20 Oct 2010 14:26

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