Publication

A microreactor-based system for the study of fast exothermic reactions in liquid phase: characterization of the system

Thomas Maeder, Peter Ryser, Marie-Agnès Schneider
2004
Journal Articles

Abstract

A new system combining a microreactor and a microcalorimetric chip was investigated. The small size of the microreactor channel permits maintaining isothermal conditions necessary for the kinetic characterization of highly exothermic reactions. These conditions are not easily obtained in classical calorimetric systems. The degree of mixing in the microchannel, which plays an important role for the characterization of fast reactions, was determined experimentally using an iodate–iodide system and confirmed by calculations. The calorimetric system was calibrated by performing the neutralization reaction of NaOH with H2SO4 in the microchannel. Several optimizations of the microreactor design allowed to raise the sensitivity of the system and to preheat the entering fluids. The results obtained were repeatable and reproducible. The establishment of the heat balance and the evaluation of the various resistances allowed a better global understanding of the system.

Official source

https://infoscience.epfl.ch/entities/publication/34b69488-76c3-41ba-b143-da4f9b5b7845

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Thomas Maeder, Peter Ryser, Marie-Agnès Schneider
2004
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/34b69488-76c3-41ba-b143-da4f9b5b7845

About this result

Related concepts (32)

Calorimetry

In chemistry and thermodynamics, calorimetry () is the science or act of measuring changes in state variables of a body for the purpose of deriving the heat transfer associated with changes of its state due, for example, to chemical reactions, physical changes, or phase transitions under specified constraints. Calorimetry is performed with a calorimeter. Scottish physician and scientist Joseph Black, who was the first to recognize the distinction between heat and temperature, is said to be the founder of the science of calorimetry.

Chemical reaction

A chemical reaction is a process that leads to the chemical transformation of one set of chemical substances to another. Classically, chemical reactions encompass changes that only involve the positions of electrons in the forming and breaking of chemical bonds between atoms, with no change to the nuclei (no change to the elements present), and can often be described by a chemical equation. Nuclear chemistry is a sub-discipline of chemistry that involves the chemical reactions of unstable and radioactive elements where both electronic and nuclear changes can occur.

First law of thermodynamics

The first law of thermodynamics is a formulation of the law of conservation of energy, adapted for thermodynamic processes. A simple formulation is: "The total energy in a system remains constant, although it may be converted from one form to another." Another common phrasing is that "energy can neither be created nor destroyed". While there are many subtleties and implications that may be more precisely captured in more complex formulations, this is the essential principle of the First Law.

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A microreactor-based system for the study of fast exothermic reactions in liquid phase: characterization of the system

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