Distillation Modeling
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Distillation Modeling - Process Design Practice - Lecture Slides, Slides of Process Engineering
Some topics for Process Design Practice course are Mass integration, Advanced column design, Physical property prediction, Process risk assessment and Integration of design and control. This lecture includes: Distillation Modeling, Distillation Fundamentals, Mccabe-Thiele Diagram, Distillation Column Design, Distillation Column Rating, Tray Sizing and Rating, Reactive Distillation, Balancing Kinetics and Hydraulics, Aspen Plus Input Forms, Chemistry
Typology: Slides
2012/2013
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Distillation Modeling
Distillation Fundamentals
•^
Understanding the Design Problem–^
Distillation Column Design vs. Distillation Column Rating
-^
Requires different tools, i.e. DISTWU and RADFRAC
-^
Remember you must
design
the columns for 100%
capacity, but
rate
them for 67% capacity
•^
DISTWU–^
This model uses the Winn-Underwood-Gilliland methodto estimate minimum reflux and number of stages
•^
RADFRAC–^
Rigorous distillation rating model for a given number ofstages, feed location and reflux ratio
Distillation Column Design
Using DISTWU in ASPEN Plus
Distillation Column Rating
Using RADFRAC in ASPEN Plus
Reactive Distillation
•^
Specifying Reactions and Chemistry–^
Reactive
distillation
is
often
employed
in
equilibrium
systems to drive the reaction forward by removing oneof the components:
-^
In a Reactive Distillation column, each theoretical stagecan be considered as an individual CSTR
-^
From a kinetic standpoint, the design problem can beequated to the “CSTRs in Series” problem from yourreactor design course
-^
In
ASPEN
Plus
“REACTIONS”
and
“CHEMISTRY”
are
NOT
the same thing!
A + B
C + D
Reactive Distillation
•^
ASPEN Plus Input Forms
Defining the Reaction
RADFRAC Input Form
Reactive Distillation
•^
Balancing Kinetics and Hydraulics (Cont’d)
Tray Hold-up Specification
Troubleshooting RADFRAC
•^
Common Problems–^
Over specified column
-^
Not enough iterations
-^
Infeasible design specifications
-^
Operation below minimum reflux
-^
Wrong initialization routine