Reaction Engineering III

Code:

EQ0032

Acronym:

ER III

Keywords
Classification	Keyword
OFICIAL	Chemical Engineering

Instance: 2007/2008 - 1S

Active?	Yes
Responsible unit:	Department of Chemical and Biological 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
LEQ	0	Plano de estudos de transição para 2006/07	4	7	7	-
MIEQ	103	Syllabus since 2006/2007	4	-	7	-

Teaching language

Portuguese

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 Catalyst particle as a dynamical system (analogies).
I.4 The effect of diffusional limitations on the measurement of kinetical parameters.
I.5 The effect of diffusional limitations on yield and selectivity of complex reaction schemes.
I.6 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

Teaching methods and learning activities

Lectures with emphasis on methods to handle catalytic reactors supported by examples from biotechnology, materials and microreactor technology.
The solving problems sessions address techniques to solve concrete problems of reactor design.

Evaluation Type

Evaluation with final exam

Assessment Components

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

Eligibility for exams

According to the law

Calculation formula of final grade

FC = FE

Classification improvement

By new exam

Observations

Final exam without consulting notes/books.