Form 20
Version 3.0 (2007/2008)
Heriot-Watt University - Module Descriptor Template (RAY)
Module Title
Separation Processes A
School
Engineering and Physical Sciences
Module
Co-ordinator
3rd Year Director of Studies
SCQF
Level
9
1. Pre-requisites
B48BB Process Engineering A
2. Linked Modules
(specify if synoptic)
3. Excluded Modules
B48CD Separation Processes B (Synoptic)
4. Replacement Module
Code:
5.
Module
Code
Semester
B49CA
Availability as an
Elective
Yes
1
No
On or OffCampus
ON
Credits
15
X
Date Of Replacement:
6. Degrees for which this
is a core module
7. Aims
All BEng and MEng Chemical Engineering Degrees
The aim of this module synoptic set is to introduce separation of mixtures, where process is dictated by either an equilibrium condition or a rate of transfer. This first
module in the synoptic set deals with liquid systems and covers the application of theory to the design and operation of key unit operations, including distillation, liquidliquid extraction, gas absorption and evaporation. Practical experiments reinforce subject matter covered with learning materials.
8. Syllabus







Fundamental concepts in mass transfer, particularly two-film models, film and overall MT coefficients.
Determination of local MT rates. Correlations for MT coefficients and similarities between heat and mass transfer.
Liquid-liquid extraction: equilibrium data for immiscible and partially miscible systems. Stage calculations for single-stage, cross-flow and countercurrent
systems.
Binary distillation: continuous distillation (column configuration, condensers, reboilers). McCabe-Thiele approach for binary systems. Total, minimum, and
optimum reflux. Effect of feed thermal condition, product specifications and relative volatility. Sidestreams and multiple feeds. Binary batch distillation (single
stage, multi-stage).
Evaporation: types of evaporators. Multi-effect evaporators and their arrangement. Evaporator sizing calculations. Steam economy. Condensing and vacuum
equipment.
Design of packed contacting columns: height and number of transfer units, concentrated and dilute applications. Minimum liquid flow rate, operating lines.
Methods for determining the number of transfer units. Determining HTU values. Heat effects – isothermal, adiabatic treatments.
Hydraulic design of packed and plate columns: types and configurations of internals, pressure drop and hold up characteristics.
Form 20
Version 3.0 (2007/2008)
Heriot-Watt University - Module Descriptor Template (RAY)
Module Title
Separation Processes A
School
Engineering and Physical Sciences
Module
Co-ordinator
3rd Year Director of Studies
SCQF
Level
9
Module
Code
B49CA
Semester
1
On or OffCampus
ON
Credits
15
9. Learning Outcomes (HWU Core Skills: Employability and Professional Career Readiness)
Subject Mastery
Understanding, Knowledge and Cognitive Skills
Scholarship, Enquiry and Research (Research-Informed Learning)

Personal Abilities
Apply principles of equilibrium and material balances to the sizing of typical process unit operations; distillation, liquid-liquid extraction
systems.
 Understand the limitations imposed for processes which are dictated by rate of transfer; absorption columns.
 Describe interconnected mass and heat transfer processes, e.g. evaporation, flash separation, mathematically. Solve the equations
developed.
 Apply design procedures for a range of unit operations: distillation, absorption, adsorption, liquid-liquid extraction.
 Develop knowledge of evaporator types and other related equipment. Be able to perform basic evaporation calculations.
 Appreciate the differences between single effect evaporation and multi-effect evaporation and know when and why to use multi-effect
evaporators.
Industrial, Commercial & Professional Practice
Autonomy, Accountability & Working with Others Communication, Numeracy & ICT





10. Assessment Methods
Method
Examination
Coursework
Increase awareness of the theory behind key separation operations.
Develop skills in mathematical analysis of physical phenomena to generate mathematical equations to ease the design of separation
process equipment.
Acquire knowledge of the industrial practices relating to key unit operations.
Work in small groups on specific technical problems in the separations area and demonstrate proper use of the appropriate tools to solve
problems.
Demonstrate competency in reporting findings and relating them to other learning material.
11. Re-assessment Methods
Duration of Exam
(if applicable)
2 hours
Weighting (%)
Synoptic modules?
70%
B49CD
Method
Duration of Exam
(if applicable)
30%
Examination (synoptic with
B49CD)
Coursework
3 hours
12. Date and Version
Date of Proposal
29 Feb 2008
Date of Approval by
School Committee
Date of
Implementation
Version
Number
1.0