Code: | L.EQ022 | Acronym: | PSI |
Keywords | |
---|---|
Classification | Keyword |
OFICIAL | Technological Sciences (Chemical Engineering) |
Active? | Yes |
Responsible unit: | Department of Chemical and Biological Engineering |
Course/CS Responsible: | Bachelor in Chemical Engineering |
Acronym | No. of Students | Study Plan | Curricular Years | Credits UCN | Credits ECTS | Contact hours | Total Time |
---|---|---|---|---|---|---|---|
L.EQ | 108 | Syllabus | 3 | - | 6 | 58,5 | 162 |
Teacher | Responsibility |
---|---|
Domingos Azevedo Gonçalves Barbosa |
Recitations: | 4,50 |
Type | Teacher | Classes | Hour |
---|---|---|---|
Recitations | Totals | 1 | 4,50 |
Domingos Azevedo Gonçalves Barbosa | 4,50 |
The main aim of this course is to illustrate the importance of separation and purification processes for the technological and economical feasibility of industrial processes, giving the students the necessary background for the selection, analysis and design of some of the most common separation processes that can be found in the chemical and similar industries. In particular: solvent extraction, distillation, evaporation, drying and crystallization.
The students are expected to attain the following skills:
- Identify the basic principles governing the different classes of separation processes;
- Choose the process (or processes) more adequate to attain the desired separation/purification;
- Do the simplified design of the equipment for solvent extraction, distillation, evaporation, drying and crystallization, identifying the influence of the main operating and design variables in the final separation.
- Present alternatives for energy conservation in distillation processes.
Knowledge of thermodynamics and mass end energy balances.
INTRODUCTION: Characterization and classification of separation processes. Notion of separating agent, recovery and purity. Basic notions on selection of separation processes.
SOLVENT EXTRACTION: The importance of solvent extraction. Liquid-Liquid and solid-liquid extraction processes. Description of the liquid-liquid and solid-liquid equilibrium. Extraction in a single equilibrium stage and in units with several equilibrium stages operating in cross and counter-current flow. Analysis of the influence of the different operating and design variables in the separation using algebraic and graphic methods. Brief introduction to supercritical extraction and aqueous two phase systems. Reference to the use of ionic liquids as solvents.
BINARY DISTILLATION: The importance of distillation in the chemical and related industries. Brief revision on the design of flash units and calculation of vapour-liquid equilibrium. Design of conventional and complex distillation columns by the McCabe-Thiele method. Notion of overall, stage and point efficiency. Application of the Murphree and vaporization efficiencies to the design of distillation columns.
MULTICOMPONENT DISTILLATION: Distinction between simulation and design methods. Rigorous and shortcut design methods. Design of multicomponent distillation columns by the shortcut method of Gilliland - Underwood - Fenske –Kirkbride. Derivation of the MESH equations for rigorous design and simulation of distillation columns. The open access simulator COCO. Shortcut methods for sequencing of distillation columns for non-azeotropic mixtures. Reference to extractive, azeotropic and reactive distillation.
BATCH DISTILLATION: Comparison between batch and continuous distillation. Analysis of the simple distillation process (Rayleigh distillation), and distillation at constant reflux and constant composition.
ENERGY CONSERVATION IN DISTILLATION PROCESSES: Analysis of the different strategies for energy conservation in distillation processes including the optimization of the operating conditions, energy integration of the distillation columns, intermediate reboilers and condensers and vapour recompression.
EVAPORATION: Types of industrial evaporators and their applications. Economy and capacity of a system of evaporators. Calculation of the temperature of liquid solutions. Notion of boiling point rise (BPR) and the use of Duhring diagrams. Analysis of a single effect evaporator. Design of multiple-effect evaporators operating in counter and co-current.
DRYING AND HUMIDIFICATION: Types of industrial dryers and their applications. Definition of absolute humidity, relative humidity, adiabatic saturation temperature, and wet bulb temperature. Use of the psychrometric diagram. Drying velocity laws. Design of dryers. Brief introduction to the liofilization process.
CRYSTALLIZATION: Introduction, advantages and disadvantages of crystallization, examples of industrial application and main types of crystallizers. Material balance to a crystallizer and solubility calculations. Stages of the crystallization process and determination of crystal size distribution (CSD). Analysis and design of the perfectly stirred crystallizer (MSMPR).
Exposition of the theoretical concepts, using different audiovisual media, and analysis of problems exemplifying the application of these concepts.
Designation | Weight (%) |
---|---|
Teste | 66,70 |
Exame | 33,30 |
Total: | 100,00 |
Designation | Time (hours) |
---|---|
Estudo autónomo | 99,00 |
Frequência das aulas | 63,00 |
Total: | 162,00 |
According to FEUP's regulations.
The distributed evaluation will consist of 3 intermediate tests, which will focus on specific chapters of the subject taught, and students may choose to only take a final exam.
If the student chooses to carry out the distributed evaluation, the final classification will correspond to the arithmetic average of the classifications obtained in the 3 intermediate tests, the last of which will be carried out during the normal exam period.
Students who miss an intermediate test, or want to improve the classification obtained in one of the tests, may, on the date of the 3rd test / normal exam period, choose to take:
3rd + 1st Tests (T31)
3rd + 2nd Tests (T32)
Final Exam (EF) (i.e., 1st + 2nd + 3rd Tests)
Depending on the student's option, the Final Classification (CF) will be calculated as follows:
CF = (T1 + T2 + T3)/3
CF = (1/3)*T1 + (2/3)*T32
CF = (1/3)*T2 + (2/3)*T31
CF = EF
where,
Ti – Classification obtained in test i
Tij - Classification obtained in the i+j test
EF – Classification obtained in the final exam
The recourse exam, whether for approval or improvement of classification, will cover all the chapters taught.
Not applicable
By final exam.
By final exam.