# SEPARATION PROCESSES 2 - 2022/3

Module code: ENG3185

## Module Overview

Multicomponent separation is the most commonly used industrial separation process and a sound understanding of the fundamental principles (material/energy balances, vapour-liquid, liquid-solid, gas-solid and liquid-liquid equilibrium, separation efficiency and system hydrodynamics) defining the operation of such processes is essential to a graduate engineer.  This module extends a students knowledge and understanding to include multicomponent systems involving distillation, ultra-filtration and adsorption.

### Module provider

Chemical and Process Engineering

COSTELLO Katie (Chm Proc Eng)

### Module cap (Maximum number of students): N/A

Independent Learning Hours: 96

Lecture Hours: 33

Tutorial Hours: 10

Guided Learning: 11

Semester 1

None.

## Module content

Indicative content includes:

Introduction

• Yield and Separation Factor

• Effect of operating variables on separation performance

Multicomponent Liquid/Vapour Systems

Ideal Systems

• Definition of K value and use

• Dew/bubble point calculations

Non-ideal systems

• Cubic equations of state

• Fugacity and compressibility

• Activity and Gibbs-Duhem equation

• Activity models

• Azeotropes and azeotropic separation

Ideal Single Stage Vapour/Liquid Separation

• Isenthalpic single stage equilibrium

• Control of "flash" vessels

Multicomponent Distillation

• Effect of operating variables on separation efficiency

• Internal flow rates, concentration and temperature profiles

• Nmin and Rmin

• Key and non-key components

• Shortcut Design Method

• Fenske equation

• Underwood equation

• Gilliland / Eduljee correlation

• Kirkbride correlation

• Use of equation set

• Plate to plate design

• Generalised methods

• MESH equations, matrix solutions

• Inside out and rigorous solution

Complex Fractionation

• Complex petroleum fractionation

• TBP curves and pseudo components

• Pump-arounds, side streams, multiple products

• Control of complex fractionation

Column and Tray Efficiency

• Basic definitions and correlations

Tray and Column Hydraulics

• Hydraulic design and operation

• Hydraulic gradient and tray passes

• Pressure drop, tray pressure balance and downcomer backup

• Froth height and tray spacing

• Design variables and effects on operation

• Hydraulic malfunctions

Fluid/Solid and Bio-separations

• Membranes, ultrafiltration, reverse osmosis

• Design considerations

• Theory for porous and solution membranes

## Assessment pattern

Assessment type Unit of assessment Weighting
Coursework COURSEWORK 20
Examination 2 HOUR INVIGILATED EXAM 80

N/A

## Assessment Strategy

The assessment strategy is designed to provide students with the opportunity to demonstrate their knowledge and analytical skills over the full range of module material and to encourage progressive learning.

Thus, the summative assessment for this module consists of:

• Coursework - 20% (LO1, LO3)

• Examination – 80%, 2 hours (LO1, LO2, LO3, LO4)

Formative assessment

Formative assessments will include:

• A revision of pre-requisite knowledge from previous modules at the start of the semester

• Exam-style short questions during the semester to test ongoing knowledge and to practice exam technique.

Feedback

Verbal feedback during tutorial sessions, written feedback on the coursework.

## Module aims

• a systematic appreciation and critical awareness of the importance of component separation to the process industry
• a comprehensive appreciation of the characteristics of the separation of ideal and non-ideal multicomponent systems using a variety of techniques
• an in-depth appreciation of the inter-relationships between the separation performance and operating parameters of multicomponent separating devices
• a knowledge of the design methodologies of multicomponent distillation columns
• an appreciation of the effects of hydraulic malfunction on separation efficiency and the ability to propose feasible scenarios of malfunction based on operating data
• prepare a scoping design and initial sizing of some separation operations of complex biological systems, based on either adsorption or membranes

## Learning outcomes

 Attributes Developed 001 Propose suitable models to explain the complexity of multicomponent multiphase equilibrium and to test and confirm their applicability. KC 002 Explain the operating characteristics of multicomponent separating devices and their inter-relationship and analyse the appropriate equilibrium, material and energy balances. KC 003 Confidently scope out a distillation column design in sufficient detail to efficiently set up a process simulator to carry out a design simulation. KCP 004 Accurately prepare a scoping design and initial sizing of some biological separation operations based on either adsorption or membranes KC

Attributes Developed

C - Cognitive/analytical

K - Subject knowledge

T - Transferable skills

P - Professional/Practical skills

## Methods of Teaching / Learning

The learning and teaching strategy is designed to:

• Take students logically through the challenging material associated with complex multicomponent multiphase separation.

• To ensure a logical and progressive learning experience

• To allow students to practice their skills on a series of real life tutorial problems in a supportive environment.

The learning and teaching methods include:

• Lectures

• Tutorials

• Coursework

• Independent Learning

Indicated Lecture Hours (which may also include seminars, tutorials, workshops and other contact time) are approximate and may include in-class tests where one or more of these are an assessment on the module. In-class tests are scheduled/organised separately to taught content and will be published on to student personal timetables, where they apply to taken modules, as soon as they are finalised by central administration. This will usually be after the initial publication of the teaching timetable for the relevant semester.