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New configuration for heteroazeotropic batch distillation: I. Feasibility studies

ESCAPE 182nd June 2008. 2. Outline. 1. Introduction2. Column configurations and the feasibility method3. Calculations for a binary heteroazeotropic mixture (n-butanol - water)4. Calculations for a ternary mixture (isopropanol

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New configuration for heteroazeotropic batch distillation: I. Feasibility studies

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    1. ESCAPE 18 2nd June 2008 1 New configuration for heteroazeotropic batch distillation: I. Feasibility studies Peter Lang1, Ferenc Denes1, Xavier Joulia2 1BUTE Dept. of Building Services & Process Engineering H-1521 Budapest, Muegyetem rkp. 3-5 2LGC-ENSIACET-INPT 118 route de Narbonne, 31077 Toulouse, France

    2. ESCAPE 18 2nd June 2008 2 Outline 1. Introduction 2. Column configurations and the feasibility method 3. Calculations for a binary heteroazeotropic mixture (n-butanol - water) 4. Calculations for a ternary mixture (isopropanol water + benzene) 5. Conclusion

    3. ESCAPE 18 2nd June 2008 3 1. Introduction The recovery of the organic solvent streams is performed mainly by distillation. If components of a mixture form a heteroazeotrope or by the addition of an entrainer a heteroazeotrope can be formed, the azeotropic composition can be crossed by decantation. In the pharmaceutical and fine chemical industries because of the small amount of the products and the frequent product changes batch processes including the batch heteroazeotropic distillation (BHD) are widely applied.

    4. ESCAPE 18 2nd June 2008 4 The objectives of our work:

    5. ESCAPE 18 2nd June 2008 5 Configurations of the heteroazeotropic batch rectification

    6. ESCAPE 18 2nd June 2008 6

    7. ESCAPE 18 2nd June 2008 7

    8. ESCAPE 18 2nd June 2008 8 Feasibility method

    9. ESCAPE 18 2nd June 2008 9

    10. ESCAPE 18 2nd June 2008 10 3. Calculations for binary heteroazeotropic mixture

    11. ESCAPE 18 2nd June 2008 11 Calculation results for different compositions

    12. ESCAPE 18 2nd June 2008 12 In the cases studied the performance of the two configurations were nearly the same. In the case of the double-column configuration - greater recovery of butanol was reached, - more water was recovered, and - less byproduct was produced. However the energy demand increased to a small extent.

    13. ESCAPE 18 2nd June 2008 13 4. Calculations for the ternary mixture

    14. ESCAPE 18 2nd June 2008 14

    15. ESCAPE 18 2nd June 2008 15

    16. ESCAPE 18 2nd June 2008 16 Calculation results In the case of the double-column system - the recovery of IPA is greater, - more water is recovered, - there is no byproduct. However the process was somewhat quicker in the case of the single-column configuration (smaller energy consumption).

    17. ESCAPE 18 2nd June 2008 17 5. Conclusion

    18. ESCAPE 18 2nd June 2008 18 Thank you for your attention.

    19. ESCAPE 18 2nd June 2008 19 References - Modla G., P. Lang, K. Molnar, (2001). Batch Heteroazeotropic Rectification, 6th WCCE, Melbourne, Australia, (10 pages on CD). - Modla G., P. Lang , B. Kotai, K. Molnar, (2003). AIChE J, 49 (10), 2533. - Rodriguez-Donis I, V. Gerbaud, X. Joulia, (2002). AIChE J, 48 (6), 1168. - Rodriguez-Donis Y., J. Equijarosa, V. Gerbaud, X. Joulia, (2003). AIChE J, 49, 3074. - Skouras S., V. Kiva , S. Skogestad, (2005a). Chem. Eng. Sci., 60, 2895. - Skouras S., S. Skogestad, V. Kiva, (2005b). AIChE Journal, 51 (4), 1144-1157. - Lang P., G. Modla, (2006). Chem. Eng. Sci., 61, 4262-4270.

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