Separations Unit-Ops Noor Ahmad · Thomas Deskins · Lily Li · Shiv Patel. - презентация

1 Separations Unit-Ops Noor Ahmad · Thomas Deskins · Lily Li · Shiv Patel

2 Outline Types of Distillation Column Unit-Ops Shortcut Distillation SCDS (Simultaneous Correction Distillation) Tower Column Tower Plus Batch Distillation Industrial example Running a Column in ChemCad Stream Reports & Plots

3 Shortcut Distillation Used only for educational purposes Not used by Industry Not a rigorous column Fenske-Underwood Method used Rough Estimates for Theoretical number of stages, Optimal feed location, R min, and fractional recoveries, etc.

4 SCDS Distillation Simultaneous Correction Distillation System Non-ideal (activity coefficients, reactivity, etc) Packed column Models real behavior Uses thermodynamics to calculate mass and energy balances

5 Tower Column Uses the inside-out rigorous method for multistage VLE When computational power was limited, this was used more often than SCDS distillation Requires less iterations and converges faster

6 Tower Plus Also uses the inside-out rigorous method Allows for complex columns This model is very difficult to converge and is often only used in petroleum and refining applications

7 Which Distillation Column to Choose?

8 Industrial Example Plant operated by MOL Group, Hungarian Multinational Oil and Gas Company Located in Algyõ, Hungary Gas Distillation of Crude Oil Image from: emersonprocess.com Image from:

9 Example/Dem o

10 Step 1: Open Workspace, Select Components

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12 Step 2: Set Units and Flowsheet

13 Step 3: Run Flowsheet and Specify Recovery.

14 Step 4: Stream and Unit Op Reports

15 Stream Report

16 Unit-Op Report & Plots

17 References NVERGENCE.pdf ts/ProvenResults/OilGasRefining/RES_OG_MOL_Algyo_APC_Final_7-11.pdf

18 Questions