12-Lect-ChemPlant

12-Lect-ChemPlant - Outline 1 Synthesizing the Design of a...

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1 Chemical Reaction Engineering - Musgrave Synthesizing Design, Mole Balances and Microreactors Lecture 12 - Page 1 Outline: 1. Synthesizing the Design of a Chemical Plant (Fogler 4.6) 2. CRE in terms of F A or C A (Fogler 4.7) Next: (Fogler 4.9) 1. Microreactors (Fogler 4.8) 2. Membrane Reactors (Fogler 4.9) Chemical Reaction Engineering - Musgrave Synthesizing Design, Mole Balances and Microreactors Lecture 12 - Page 2 Plant design involves not only designing the chemical processes and equipment to carry out those processes, but also a financial analysis of the plant operation: Chemical Processes Separations Separations Raw Materials Final Product Labor Energy Interest Overhead Depreciation Will the plant make a profit? Sales of Products ($/yr) Energy bill ($/yr) Salaries ($/yr) Overhead ($/yr) Loan Payments ($/yr) Depreciation ($/yr) Profit = Out-In [can be < 0 (GM)] Considerations: 1. Impurity tolerant processes (less separations) 2. Processes involving simpler reactors 3. Fewer steps = fewer reactors 4. More selective = few separators 5. Continuous = lower labor costs 6. Energy efficient = lower energy bills 7. Safer = lower insurance, down time 8. Simple operation = lower labor costs 9. Can byproducts be sold or recycled? Taxes Carbon taxes Design Etc. Separations Separations Raw Materials
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2 Chemical Reaction Engineering - Musgrave Synthesizing Design, Mole Balances and Microreactors Lecture 12 - Page 3 Products Rate (lb/yr) Cost (USD/lb) Value (USD/yr) Ethelene Oxide 2000000000 0.38 760000000 H2 66666666 0.16 10666667 770666667 Costs Raw Materials Sulfuric Acid 223000000 0.043 9589000 Ethane 4000000000 0.04 160000000 Energy 1500000 Labor 3000000 Overhead 500000 Interest 800000 Depreciation 1200000 176589000 Profit 594077667 Will the plant make a profit? Sales of Products ($/yr) Energy bill ($/yr) Salaries ($/yr) Overhead ($/yr) Loan Payments ($/yr) Depreciation ($/yr) Profit = Out-In Can be < 0 (GM) Chemical Reaction Engineering - Musgrave Synthesizing Design, Mole Balances and Microreactors Lecture 12 - Page 4 It may be convenient to write our mole balances in terms of C i or F i instead of X. For example, in the cases of multiple reactions and membrane reactors . In these cases we’ll modify the CRE algorithm for this different way of doing the mole balances. 1. Mole Balances 2. Rate Law 3. Stoichiometry 4. Combine 5. Analyze 1. Mole Balances For each species in terms of F i or C i 2. Rate Law For each reaction with significant rate 3. Stoichiometry a. Relate r i for each species to another b. Write C i in terms of F i (gas phase) or Just write C i (liquid phase) 4. Include pressure drop (gas phase) 5. Analyze (may need ODE solver)
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3 Chemical Reaction Engineering - Musgrave Synthesizing Design, Mole Balances and Microreactors Lecture 12 - Page 5 dy dW = α F T 2 yF T 0 T T 0 , y = P P 0 Combine. If multiple coupled differential equations then ODE combines and solves Pressure Drop (if significant) Combine and Evaluate PFR CSTR
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This note was uploaded on 04/25/2010 for the course CHEN 4330 taught by Professor Staff during the Spring '08 term at Colorado.

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12-Lect-ChemPlant - Outline 1 Synthesizing the Design of a...

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