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CHEMCAD Distillation. David Weglein Savannah Green Heather Cook Michael Wellen. Recently used files. Tabs to access other things. Data tree from simulation. Access VBA programming. Errors and warnings, run trace, and notes. Palette. Workspace. Checklist. What if…. - PowerPoint PPT Presentation
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CHEMCAD Distillation
David WegleinSavannah Green
Heather CookMichael Wellen
Recently used files
Tabs to access other things
Data tree from simulation
Access VBA programming
Errors and warnings, run trace, and notes
Palette
Workspace
Checklist
What if…• You have a Japanese client working in Yen, who liked everything about the metric scale
except length measurements, thinks the Rankine scale is underrated, and likes his vapor density in lb/ft3
• No problem!
Checklist
Choosing a Thermodynamic Model
Recommendations
Gas Phase Only
Ideal Solution
Non-ideal Solution
Checking Equilibrium Data
CHEMCAD Distillation Columns
• 4 types of columns, differ in:– What algorithm they use– What information load they can handle– What parameters you can find from simulation
#1 – Shortcut Column• Uses Fenske-Underwood
method• One feed, bottoms and
distillate• Typically used as a way to
get rough estimates– Reboiler/condenser duties,
number of theoretical stages, optimum feed location, fractional recoveries.
• Industrial users will (should) not use this one
#2 - SCDS• Simultaneous Correction Distillation
System– Uses a “simultaneous correction”
algorithm• Can do reactive distillation, mass
transfer distillation (packing)• Stable with non-ideal
thermodynamics• Handles a large number of stages• Multiple feeds, side stream possible• In addition to what the SHOR
column can do, can also do mass transfer and tray efficiency
• Commonly used
#3 - Tower• “Inside-out algorithm”• Used for large number of
components, small number of stages
• Can do dynamic (non-steady-state) simulations
• No efficiencies, mass transfer, or reactive distillation
• Used more for hydrocarbons
#4 – Tower+
• Used for crude oil• Complex columns
Recommendations
Demo