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ChemCad Introduction: Separation Unit-Ops
Joseph Dadzie Julia Lamb Nivetita Ravi Anju Thottakara Joe
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Shortcut Distillation
Conclusion Example SCDS Distillation Shortcut Distillation Component Separator Batch Distillation Flash Distillation
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Flash Distillation Basics
Single stage separation Isothermal and adiabatic Water-hydrocarbon systems Flash Distillation Component Separator SCDS Distillation 3 Batch Distillation Shortcut Distillation Conclusion Example
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Shortcut Distillation
Flash Distillation Component Separator SCDS Distillation 4 Batch Distillation Shortcut Distillation Conclusion Example
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Shortcut Distillation
Flash Distillation Component Separator SCDS Distillation 5 Batch Distillation Shortcut Distillation Conclusion Example
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Shortcut Distillation
When to Use Remove volatile components Prepare for further processing Pdew < Poperating < Pbubble Flash Distillation Component Separator SCDS Distillation 6 Batch Distillation Shortcut Distillation Conclusion Example
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Batch Distillation Column
Batch distillation rather than continuous smaller quantities specialty chemicals Specify still pot composition, column design parameters Flash Distillation Component Separator SCDS Distillation 7 Batch Distillation Shortcut Distillation Conclusion Example
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Batch Distillation Column
What it is How to use When to use it Flash Distillation Component Separator SCDS Distillation 8 Batch Distillation Shortcut Distillation Conclusion Example
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Shortcut Distillation
Component Separator General separator can specify split fractions or split flow rates for components Useful when trying to model steady state conditions of unusual separation equipment and conditions (i.e. membrane separation) -can specify split fraction or split flow rate for each component -more of an “abstract” separator; black-box separator -can be used to isolate a pure component from a mixture or Flash Distillation Component Separator SCDS Distillation 9 Batch Distillation Shortcut Distillation Conclusion Example
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Shortcut Distillation
Component Separator Flash Distillation Component Separator SCDS Distillation 10 Batch Distillation Shortcut Distillation Conclusion Example
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Shortcut Distillation
General Setup General purpose Information for SCDS Column Flash Distillation Component Separator SCDS Distillation 11 Batch Distillation Shortcut Distillation Conclusion Example
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Shortcut Distillation
Fenske equation to find Nmin, Use Biegler notes Flash Distillation Component Separator SCDS Distillation 12 Batch Distillation Shortcut Distillation Conclusion Example
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Shortcut Distillation
SCDS Distillation General Setup General Purpose Liquid/Liquid Separation Multi-Stage Distillation Multi-Feed Distillation Flash Distillation Component Separator SCDS Distillation 13 Batch Distillation Shortcut Distillation Conclusion Example
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Shortcut Distillation
SCDS Distillation Flash Distillation Component Separator SCDS Distillation 14 Batch Distillation Shortcut Distillation Conclusion Example
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Shortcut Distillation
Separation Example Separating alkanes of different molecular weights: Pentane, Heptane, Octane Flash Distillation Component Separator SCDS Distillation 15 Batch Distillation Shortcut Distillation Conclusion Example
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Shortcut Distillation
Separation Example Determine Number of Stages and reflux ratio using desired equations. Fenske equation from Biegler notes: Determine the feed stage from the shortcut column Input stage values into SCDS Column Flash Distillation Component Separator SCDS Distillation 16 Batch Distillation Shortcut Distillation Conclusion Example
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Shortcut Distillation
Heuristics Separation Hierarchy (What should be removed first) Direct Sequence Indirect Mixed Separation Order (pg. 828 Process Design) Corrosives Remove heaviest first if there are solids Remove if non condensable with cooling water Remove any components in excess Flash Distillation Component Separator SCDS Distillation 17 Batch Distillation Shortcut Distillation Conclusion Example
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Shortcut Distillation
Final Comments T-XY and X-Y Diagrams (Plot -> TPXY) Specific column properties (Report -> Distillation) Reflux rate – impacts sizing and cost Flash Distillation Component Separator SCDS Distillation 18 Batch Distillation Shortcut Distillation Conclusion Example
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