Reaction Engineering III

Code:

EQ0089

Acronym:

ER III

Keywords
Classification	Keyword
OFICIAL	Technological Sciences (Chemical Engineering)

Instance: 2011/2012 - 1S

Active?	Yes
Responsible unit:	Department of Chemical Engineering
Course/CS Responsible:	Master in Chemical Engineering

Cycles of Study/Courses

Acronym	No. of Students	Study Plan	Curricular Years	Credits UCN	Credits ECTS	Contact hours	Total Time
MIEQ	31	Syllabus	4	-	7	56	189

Teaching language

Suitable for English-speaking students

Objectives

Provide the methodology for the analysis of competition between transport phenomena and reaction in the heterogeneous catalytic reactors in view of the simulation, design and optimisation of operation conditions.

Program

I. Problems at the catalytic particle scale

I.1.1 Spherical, slab and cylindrical geometries.
Qualitative treatment of the competition reaction/diffusion. Catalyst effectiveness factor.
I.1.2 Pore diffusion and reaction in isothermal catalysts.
I.1.3 Pore diffusion, film diffusion and reaction in isothermal catalysts.
I.1.4 Pore diffusion, pore convection and reaction in isothermal catalysts.
I.2 Diffusion/conduction and reaction in non-isothermal catalysts.
I.2.1 Damköhler equation.
I.2.2 Heat and mass transfer in the film and chemical reaction for non-isothermal catalysts.
I.2.3 Weisz-Prater number for the catalyst at chemical regime.
I.3 The effect of diffusional limitations on the measurement of kinetic parameters.
I.4 Models for catalyst poisoning: uniform and progressive poisoning. Poisoning factor.

II. Problems at reactor scale

II.1 General transient model for a fixed bed reactor. Dimensionless model equations. Model parameters.
II.2 Pseudohomogeneous and heterogeneous models of fixed bed reactors.
II.3 Unidimensional and bidimensional models. Model equivalence.
II.4 Stability diagrams
II.5 Fluidized bed reactors.

III. Multiphase reactors.

III.1 Applications.
III.2 Classification of multiphase reactors. Operation modes.
III.3 Overall mass transfer rate in multiphase systems.
III.4 Overall effectiveness factor.

IV. Non-catalytic heterogeneous reactors.

IV.1 Uses of solid/fluid reactions.
IV.2 Models for fluid/solid reactions: uniform and shrinking core models.
IV.3 Time for complete conversion of a particle: controlling film mass transfer, control by chemical reaction and control by diffusion in the ash layer.
IV.4 Relations between time, conversion and radius of unconverted core for various geometries.

Mandatory literature

Froment, Gilbert F.; Chemical Reactor Analysis and Design. ISBN: 0-471-51044-0 s
Levenspiel, Octave; Chemical reaction engineering. ISBN: 0-471-25424-X
Rodrigues, A.E.; Scientific basis for the design of two phase catalytic reactors, em “Multiphase Chemical Reactors”, Volume II – Design Methods, Rodrigues, A.E., Calo, J.M. and Sweed, N.H. (Eds.), 1981

Teaching methods and learning activities

Lectures with emphasis on methods to handle catalytic reactors supported by concrete examples.
The solving problems sessions address techniques to solve concrete problems of reactor design and examples in emerging and frontier areas.

Software

Matlab

keywords

Technological sciences > Engineering > Chemical engineering
Technological sciences > Engineering > Simulation engineering

Evaluation Type

Distributed evaluation with final exam

Assessment Components

Description	Type	Time (hours)	Weight (%)	End date
Attendance (estimated)	Participação presencial	56,00
	Total:	-	0,00

Eligibility for exams

Class attendance is compulsory, according to the conditions determined by the law.

Calculation formula of final grade

Final mark (FM):
FM = 0.3 DE + 0.7 FE

Distributed evaluation (DE) with final exam (FE).

Distributed evaluation (DE):
- Home-works (HW) and at least one oral presentation/discussion (OD) of them will be taken into account: DE = 0.5 HW + 0.5 OD
- Students will be distributed, by the teacher, in groups of 2-3 elements (depending on the number of students registered in the subject and performing DE);
- Students registered in the course unit should indicate, to the responsible teacher and until the end of the 1st week of classes, if they want to be enrolled in the distributed evaluation (DE) + final exam (FE) evaluation; otherwise they will be evaluated by FE only;
- Students that got attendance should indicate, to the responsible teacher and until the end of the 1st week of classes, if they want to be enrolled in the distributed evaluation (DE); otherwise they will be evaluated by FE only, keeping the previous DE;
- Each group will perform, along the semester, 4-5 home-works, with 1-2 problems each;
- 2 home-works of each group will be corrected and evaluated;
- In the problem-solving classes, students from a few groups will be randomly selected to solve one of the problems of the last home-work; then a short oral discussion (ca. 20 min/group) with the teacher occurs (OD);
- When all the students of the selected group are not present in the class, the oral discussion is not done (except if this situation is repeated by missing the same students, so that the colleagues are not affected). If such a group is not selected again along the semester, at the end a session will be carried out with all groups in such conditions. In such a session the groups have to present and discuss 1 of the home-works, which should be randomly selected during the session.

Special assessment (TE, DA, ...)

SStudents under these circumstances must indicate, to the responsible teacher and until the end of the 1st week of classes, if they want to be enrolled in the distributed evaluation (DE) + final exam (FE) evaluation, respecting the above mentioned rules; otherwise they will be evaluated by FE only;

Classification improvement

By a new exam, according to the law.
Either in the normal exam or in the one for classification improvement, the distributed evaluation will be ignored if this decreases the final mark.
There is no possibility for improving the distributed classification.

Observations

Final exam without consulting any type of document.