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Fribourg, Switzerland

Guinand C.,Institute ChemTech | Guinand C.,Ecole Polytechnique Federale de Lausanne | Dabros M.,Institute ChemTech | Roduit B.,AKTS Inc. | And 2 more authors.
Chimia | Year: 2014

Chemical incidents are typically caused by loss of control, resulting in runaway reactions or process deviations in different stages of the production. In the case of fedbatch reactors, the problem generally encountered is the accumulation of heat. This is directly related to the temperature of the process, the reaction kinetics and adiabatic temperature rise, which is the maximum temperature attainable in the event of cooling failure. The main possibility to control the heat accumulation is the use of a well-controlled adapted feed. The feed rate can be adjusted by using reaction and reactor dynamic models coupled to Model Predictive Control. Thereby, it is possible to predict the best feed profile respecting the safety constraints. © 2014, Swiss Chemical Society. All rights reserved.

Sanglard P.,Institute ChemTech | Vorlet O.,Institute ChemTech | Marti R.,Institute ChemTech | Naef O.,University of Applied Sciences and Arts Western Switzerland | Vanoli E.,Institute ChemTech
Chimia | Year: 2013

Ionic liquids (ILs) are efficient solvents for the selective removal of CO2 from flue gas. Conventional, offthe-shelf ILs are limited in use to physisorption, which restricts their absorption capacity. After adding a chemical functionality like amines or alcohols, absorption of CO2 occurs mainly by chemisorption. This greatly enhances CO2 absorption and makes ILs suitable for potential industrial applications. By carefully choosing the anion and the cation of the IL, equimolar absorption of CO 2 is possible. This paper reviews the current state of the art of CO2 capture by ILs and presents the current research in this field performed at the ChemTech Institute of the Ecole d'Ingénieurs et d'Architectes de Fribourg. © Schweizerische Chemische Gesellschaft.

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