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Chemical reaction engineering 2

Presentation

Programme (detailed contents):
Mass balances for ideal reactors- general balance and application to various ideal reactors – application to multiple reaction pathways, yields and selectivities.
Combination of ideal reactors for conversion and yield optimization
Influence of temperature on the performances of a reactor – Notion of Optimal Temperature Progression – Energy balances in ideal reactors
Description of real flows in reactors – Residence Time Distribution- Hydrodynamic interpretation and modelling – application to a packed bed reactor
Interactions mixing/reaction: mixing mechanisms, methodology to identify and solve a mixing/reaction problem, analysis and calculation of characteristic times, the probability density function, micromixing models. Modeling/simulation of a case study.



 
Organisation:

For every topic, a magister course presents the essential notions which will be applied in sessions of practical exercises. An experimental work on Distribution residential time (DRT) helps student to better understanding this method for characterizing flow into reactors.       

Main difficulties for students:

To understand and to calculate real (non-ideal) reactors.

Objectives

At the end of this module, the student will have understood and be able to explain (main concepts):

- reactors with variable volume / flow rates
- notions of yield and specificity of multiple reactions systems
- reactors combination (series- parallel – recycle plug flow reactor)
- the mechanisms of mixing and their link with the running of the reaction
- influence of non-ideal conditions on the conversion: Residence Time Distribution (notion of transfer function) and concentrations distribution (mixing)
- the influence of temperature on the performance of a reactor, the notion of Optimal Temperature Progression
- general equation for energy conservation in a reactor


The student will be able to:
- calculate ideal open reactors for variable flow conditions
- calculate the size or yield or selectivity of ideal open reactors for multiple reaction systems and the conversion obtained through reactors combination
- determine the RTD of a reactor
- apply a model for mixing or for mass flow to predict the conversion for a non-uniform reactor
- calculate the OTP for a given system
establish and solve energy balances on systems with or without reactions.


Form of assessment

The evaluation of outcome prior learning is made as a continuous training during the semester. According ot the teaching, the assessment will be different: as a written exam, an oral exam, a record, a written report, peers review...