Using the Transfer Function of an Isoperibolic Reaction Calorimeter for Thermo‐kinetic Analysis

Gaulke, Arnd‐Lüder; Pauer, Werner; Moritz, Hans‐Ulrich

doi:10.1002/masy.200690046

Cited by 2 publications

References 12 publications

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Comparing Methods for Calculating the Heat Flow Rate of Reactions in Different Bench‐Scale Calorimeters

Gaulke

Pauer

Moritz

2007

Macromolecular Symposia

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Summary: A transfer function of the RC1e™ (Mettler‐Toledo) calorimeter was obtained by calibration with a heating cartridge. With this function it was possible to determine the heat flow rate and total heat of different polymerization reactions. The calorimeter operates in isothermal as well as in isoperibolic mode. Additionally, 1‐vinyl‐2‐pyrrolidone and acrylic acid were polymerized in a three‐neck flask. In this common laboratory device the heat flow rate was obtained by using a transfer function calculated by calibration with a heating cartridge. Thus, the heat of polymerization can be obtained without using a calorimeter and without solving the heat balance equation.

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Comparing Methods for Calculating the Heat Flow Rate of Reactions in Different Bench‐Scale Calorimeters

Gaulke

Pauer

Moritz

2007

Macromolecular Symposia

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Avaliação de técnicas calorimétricas aplicadas ao monitoramento de processos químicos.

Hirota¹

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AGRADECIMENTOS Agradeço ao Prof. Reinaldo Giudici pela oportunidade, apoio, paciência e pela valiosa orientação durante esses três anos de trabalho em conjunto. Agradeço a Prof. Cláudia Sayer pela co-orientação e pela sua participação em mais esta etapa da minha formação. Agradeço aos professores Darci Odloak e Galo A. Carrillo Le Roux pela participação em minha qualificação e pelas sugestões e devidas correções. Agradeço ao Departamento de Engenharia Química da Escola Politécnica da Universidade de São Paulo pelo apoio e pelas oportunidades proporcionadas. Agradeço à Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) pela concessão da bolsa e pelo suporte financeiro a este projeto. A BASF pelo fornecimento dos monômeros. ABSTRACTThe increasing demand for the production of polymers with more tight properties has placed great emphasis on the development of accurate and robust online monitoring techniques of polymerization reactions.Unfortunately, most of the main characteristics are not measurable online from analytical methodologies currently available and, therefore, in practice, the final properties of polymer latexes are obtained through off line characterization of discrete samples collected from the process, resulting in measurement delay which is undesirable for real-time control. On the other hand, since most of the polymerization reactions are highly exothermic, it is possible to quantify continuously the heat release rate based on temperature measurements and energy balance equations that, in turn, can be used to infer valuable information about the state of process.However, this approach requires up-dating the value of the global heat exchange coefficient through reaction, once this parameter is subject to significant time variations.Therefore, this work aims to examine the feasibility of joint implementation of the concepts of reaction calorimetry and nonlinear state observers for estimation of the states of a chemical process. In order to do that, two distinct chemical reactions will be considered: a) a hydrolysis of acetic anhydride reaction, b) an emulsion copolymerization reaction.The results showed that this approach shows a strong dependence of the tuning parameters, preventing its use for online monitoring of a chemical process. On the other hand, applying the heat balance it is possible to infer continuously the heat release rate and the states of polymerization reactions. Keywords: nonlinear state observer, reaction calorimetry, hydrolysis of acetic anhydride, emulsion polymerization.   = J J J J J J J p n

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Using the Transfer Function of an Isoperibolic Reaction Calorimeter for Thermo‐kinetic Analysis

Cited by 2 publications

References 12 publications

Comparing Methods for Calculating the Heat Flow Rate of Reactions in Different Bench‐Scale Calorimeters

Comparing Methods for Calculating the Heat Flow Rate of Reactions in Different Bench‐Scale Calorimeters

Avaliação de técnicas calorimétricas aplicadas ao monitoramento de processos químicos.

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