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Schwolow S.,Institute For Chemische Verfahrenstechnik | Hollmann J.,Novartis | Schenkel B.,Novartis | Roder T.,Institute For Chemische Verfahrenstechnik
Organic Process Research and Development | Year: 2012

A methodology was developed to select adequate, commercially available micromixers for mixing sensitive chemical reactions. The range of flow rates can be derived at which the selected micromixers have to be operated to ensure the required mixing intensity. This methodology enables the selection of adequate micromixers for the scale up of the chemical reactions to higher flow rates. Two chemical test reactions were used for an experimental approach to characterize the selected microreactors. Both reactions are based on the effect of micromixing on the product distribution of competitive reaction systems. Flow rates and pressure drop were determined at which the mixing times are short relative to the reaction times. In this case, influences of mixing on the selectivity of the reference reaction can be neglected. Since two reference reactions with different time scales for mixing and reaction were tested, it was possible to study the mixing performance of a variety of micromixers over a wide range of flow rates. The investigated micromixers differ in their dimensions, internal geometry, and mixing principle. In the present work, overview tables are provided as a tool to evaluate the commercially available micromixers for specific applications. Further, the influence of mixing principle and pressure drop is discussed. © 2012 American Chemical Society.

Gunther P.,Institute For Chemische Verfahrenstechnik | Kunz P.,Institute For Chemische Verfahrenstechnik | Stierle R.,Institute For Chemische Verfahrenstechnik | Eigenberger G.,Institute For Chemische Verfahrenstechnik | Nieken U.,Institute For Chemische Verfahrenstechnik
Chemie-Ingenieur-Technik | Year: 2014

Adsorption heat pumps directly use thermal energy for cooling or heating. To minimize heat loss, multi-bed processes interchange the needed heat for desorption between beds, thereby re-using it. Since designing such processes is complex, it is beneficial to consider the theoretical limiting case of a stationary counter current process. This true moving bed approximation allows the use of parameter continuation methods as well as the implementation of design specifications. © 2014 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.

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