Example Ref Sieder et al Product and Process Design Principles 2 nd Edition Wiley 2004 Chapter 20 Plantwide Control Example Vinyl Chloride Production First Reaction Chlorination of Ethylene ID: 438929
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Slide1
Plant-wide ControlExample
Ref.:
Sieder
et al, Product and Process Design Principles, 2
nd
Edition, Wiley, 2004, Chapter 20.Slide2
Plant-wide Control
Example: Vinyl Chloride Production
First Reaction:
Chlorination of Ethylene At 90oC , 1.5 atm and about 100% conversionSecond Reaction: Thermal cracking of Dichloroethane At 500oC , 26 atm and about 60% conversion of DCEProducts specifications:Main product: VC (Liquid) with more than 99% purityBy product: HCl (Gas) with more that 99% purity After preliminary design, the PFD and Mass & Energy balance Table are as follows
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Plant-wide Control
Example: Vinyl Chloride Production
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Plant-wide Control
Example: Vinyl Chloride Production
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Plant-wide Control
Example: Vinyl Chloride Production
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Step 1: Design a control system to produced 100,000 lb/hr VCM with more than 99% purityStep 2: Twenty control valves have been positioned in the PFD (DOF determination) Slide6
Plant-wide Control
Example: Vinyl Chloride Production
6
Step 3: Establish the energy-management system: V-3, V-6, V-5, V-7, V-8, V-20 Slide7
Plant-wide Control
Example: Vinyl Chloride Production
7
Step 4: Set the production rate: V-1 Slide8
Plant-wide Control
Example: Vinyl Chloride Production
8
Step 5: Control product quality (V-11, V-13, V-16, V-18), and safety, environmental, and operational constraints Slide9
Plant-wide Control
Example: Vinyl Chloride Production
9
Step 6: Fix recycle flow rates (V-4) and vapor and liquid inventories (R-100, V-19, V-17, V-15, V-14, V12, V-10. Slide10
Plant-wide Control
Example: Vinyl Chloride Production
10
Steps 7 & 8: Check component balances and control individual units (V-2)