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Modules

Modules

CME2024 : Reactor Engineering

Semesters
Semester 1 Credit Value: 10
ECTS Credits: 5.0

Aims

We start by showing how material balances should be performed for the three fundamental reactor types used in reaction engineering, namely the plug-flow reactor (PFR), the continuous stirred tank reactor (CSTR) and the perfectly-mixed batch reactor. We will see how these material balances can be used to design (by this we primarily mean how to calculate their volume or residence time) reactors when one reaction is taking place. We will also compare the behaviour of the different reactors. We will proceed to look at how the design process must be modified when more than one reaction is occurring. Further, we introduce and discuss behaviour of non-ideal reactors; this is intended to illustrate the limitations of always assuming that reactors behave in an ideal manner. This will allow us to calculate the residence time and conversion of any reactions in real reactors. Finally, we will see that reactors need not be isothermal. Therefore, we need to look at how reaction rate depends upon temperature for different classes of reaction. Then we will formulate the energy balance for the simple reactor models to show importance of energy balance in reactor design.

At the end of the course the student’s attitude should move away from:
‘All reactors are too complex to model’ or ‘All reactors are either perfectly mixed or plug flow’,
Towards:
‘It is possible to describe chemical reactors using models. However, all models have limitations. It is an engineer’s responsibility to be aware of these limitations and to choose a model which is of sufficient complexity to give an answer of the required accuracy’.

Outline Of Syllabus

Reactors
Introduction to batch and continuous reactor operation, batch reactor design equation
Plug flow reactor design equation
CSTR design equation

Single reactions
Constant pressure and constant volume batch reactors
Plug flow reactors
Problem class on PFRs
CSTRs
Comparison of PFR and CSTR and CSTRs in series
Similarity between series of CSTRs and PFR
Recycle reactor

Multiple reactions
Introduction to multiple reactions, parallel reaction of the same order, Parallel Reactions Example
Parallel reactions of different orders
Problem class on parallel reaction of different orders
Consecutive reactions

Non-ideal reactors
Non-ideal reactors, residence time distribution (RTD)
Calculation of conversion from RTD

Effect of temperature on reaction rate
Energy balance for the reactors: brief introduction
Energy balance problem class

Teaching Methods

Teaching Activities
Category Activity Number Length Student Hours Comment
Guided Independent StudyAssessment preparation and completion12:002:00Exam
Guided Independent StudyAssessment preparation and completion19:009:00Exam revision
Scheduled Learning And Teaching ActivitiesLecture211:0021:00N/A
Scheduled Learning And Teaching ActivitiesPractical23:006:00Solving complex reactor problems using MATLAB
Scheduled Learning And Teaching ActivitiesSmall group teaching42:008:00Tutorials
Guided Independent StudyIndependent study154:0054:00Working through problems in in-course text.
Total100:00
Teaching Rationale And Relationship

Lectures introduce theoretical concepts that will be practiced in tutorials. The case study provides an opportunity to apply knowledge gained together with knowledge from other modules, to solve a realistic problem.

Assessment Methods

The format of resits will be determined by the Board of Examiners

Exams
Description Length Semester When Set Percentage Comment
Written Examination1201A80N/A
Other Assessment
Description Semester When Set Percentage Comment
Computer assessment1M20In-class assessment and study report (max 1000 words)
Assessment Rationale And Relationship

Examination assesses the knowledge and skills gained on closed problems where all necessary information is supplied. Case study assesses the skills obtained on open-ended problems where students must consider what information is needed to achieve a solution.

Reading Lists

Timetable