Publication

Performance enhancement of a microchannel reactor under periodic operation

Albert Renken
2001
Book Chapters

Abstract

The transient behavior of the dehydration of isopropanol has been studied in a microreactor. The av. productivity under periodic operation is found to be considerably higher compared to steady state even for conversions reaching 80%. The optimal cycle periods range from 60 to 200 s, depending on the space time. Depending of the reaction conditions an increase of the av. reactor productivity of up to 80% is obtained. The predominant influence of the catalyst capacity and the reaction rate on the length of the optimal cycle period has been emphasized. It results from this study that high frequency periodic operation is a prerequisite for fast reactions and for catalysts with a low adsorption capacity. The exptl. results could be successfully described with a mechanistic model in the whole range of exptl. conditions. The model can be applied to predict the transient behavior of different types of reactors. [on SciFinder (R)]

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https://infoscience.epfl.ch/entities/publication/b9c4d633-42cd-408d-a067-03bd238c4b09

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Albert Renken
2001
Book Chapters

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/b9c4d633-42cd-408d-a067-03bd238c4b09

About this result

Related concepts (32)

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.

Reaction rate

The reaction rate or rate of reaction is the speed at which a chemical reaction takes place, defined as proportional to the increase in the concentration of a product per unit time and to the decrease in the concentration of a reactant per unit time. Reaction rates can vary dramatically. For example, the oxidative rusting of iron under Earth's atmosphere is a slow reaction that can take many years, but the combustion of cellulose in a fire is a reaction that takes place in fractions of a second.

Reaction rate constant

In chemical kinetics, a reaction rate constant or reaction rate coefficient (k) is a proportionality constant which quantifies the rate and direction of a chemical reaction by relating it with the concentration of reactants. For a reaction between reactants A and B to form a product C, where A and B are reactants C is a product a, b, and c are stoichiometric coefficients, the reaction rate is often found to have the form: Here k is the reaction rate constant that depends on temperature, and [A] and [B] are the molar concentrations of substances A and B in moles per unit volume of solution, assuming the reaction is taking place throughout the volume of the solution.

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Performance enhancement of a microchannel reactor under periodic operation

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