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Mainz, Germany

Huebschmann S.,Friedrich - Schiller University of Jena | Kralisch D.,Friedrich - Schiller University of Jena | Breuch D.,Johannes Gutenberg University Mainz | Loewe H.,Johannes Gutenberg University Mainz | And 2 more authors.
Chemical Engineering Transactions | Year: 2010

Process intensification via continuously running syntheses in microstructured reactors offers new possibilities to realize environmentally benign chemical processes. To evaluate the environmental impacts induced by the reactions under investigation, a research accompanying life cycle assessment (LCA) has been applied in several projects dealing with process intensification in microreactors. The same adapted method was applied during the development of a phase transfer catalytic process in microstructured reactors giving phenyl benzoate. It could be shown that the overall life cycle impact of this reaction highly depends on the yield of phenyl benzoate, but can be significantly improved by the implementation of ionic liquids as phase transfer catalysts compared to the same reaction without implementing any catalyst. Copyright © 2010 AIDIC Servizi S.r.l. Source


Huebschmann S.,Friedrich - Schiller University of Jena | Kralisch D.,Friedrich - Schiller University of Jena | Loewe H.,Johannes Gutenberg University Mainz | Loewe H.,Fraunhofer Institute of Microtechnology Mainz | And 4 more authors.
Green Chemistry | Year: 2011

Continuously running syntheses in microstructured reactors offers novel ways to intensify conventional chemical processes. An outstanding advantage of microreaction technology is the high surface-to-volume-ratio which enables intensive mixing phenomena as well as high mass and heat transfer rates. Thus, microstructured reactors may be a suitable means to improve multiphase reactions by increasing the interfacial area and the intensification of internal mixing. This improvement in reaction performances may lead to reduced environmental burdens of the process under consideration. The method of simplified life cycle assessment (SLCA) is a suitable tool to evaluate the environmental burdens caused by chemical processes. It has been applied already in research and development to identify the key parameters for a deliberate green process design of two biphasic reactions, the esterification of phenol and benzoyl chloride resulting in phenyl benzoate and the synthesis of one of the corresponding phase transfer catalysts, [BMIM]Cl. Further, SLCA is complemented by a simple cost estimation to investigate the main cost drivers relevant for possible industrial application of the syntheses investigated. © 2011 The Royal Society of Chemistry. Source


Caspary R.,TU Braunschweig | Schutz S.,TU Braunschweig | Kowalsky W.,TU Braunschweig | Zoheidi M.,Leoni Fiber Optics GmbH | And 7 more authors.
International Conference on Transparent Optical Networks | Year: 2011

The fast expanding market of micro fluidic reactor systems in the chemical industry demands for small spectrometers in the mid-infrared (MIR) as analyzer for automatic process control. Conventional free-space MIR spectrometers are usually large and conventional fiber spectrometers are limited to the near-infrared (NIR) range up to 2.5 μm. We developed a fiber spectrometer for micro fluidic reactors and fluoride fibers with a spectral range up to 4 - 5 μm covering characteristic vibration bands of many molecules. The fluoride fibers with robust jacket and fiber connectors have a core/cladding diameter of 450/600 μm, a length of 2 - 5 m, and a minimum bending radius of 100 mm. © 2011 IEEE. Source


Dietrich T.,Mikroglas Chemtech GmbH | Freitag A.,Mikroglas Chemtech GmbH | Schlecht U.,Biosensor GmbH
Chemical Engineering Journal | Year: 2010

The authors developed within a project funded by the German government a micro reaction plant which allows to produce polymers out of up to 8 monomers by using the Suzuki coupling method. Micro reactors can have a positive influence on the quality of the polymer product. Especially the mixing quality of the monomers, the catalyst solution, and end capper solutions have a great influence on the molecular weight distribution. With micro reactors it is possible to have a very narrow distribution which is not achievable in typical batch processes. To monitor the product quality a new sensor was developed to measure online the product viscosity and with this the molecular weight of the polymer. © 2010 Elsevier B.V. All rights reserved. Source

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