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Overall Review CHE 1008

Overall Review CHE 1008. Chapters 1-5, 6.4, 7, 9, 11, 12, 15. Exam Details. Date, Time, & Place: Tuesday, 20 April, 2-4 PM, FMLC Closed book, closed notes, I will provide an equation summary sheet Bring a calculator, ruler, pencils Test will include Multiple choice Short answer

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Overall Review CHE 1008

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  1. Overall ReviewCHE 1008 Chapters 1-5, 6.4, 7, 9, 11, 12, 15

  2. Exam Details • Date, Time, & Place: Tuesday, 20 April, 2-4 PM, FMLC • Closed book, closed notes, I will provide an equation summary sheet • Bring a calculator, ruler, pencils • Test will include • Multiple choice • Short answer • Calculations (by calculator, not Mathcad or Aspen) • Test will be comprehensive

  3. What Could Be On The Exam? • Anything in the reading assignments • Hint: Review your reading. If you have marked your book carefully this will not be very difficult to do • Anything in the homework---you will not have to do Mathcad---you will have to know how to solve the problems • Hint: Review all the homework and homework keys, know how to solve every problem • Anything covered in class lectures • Hint: Review the lecture notes, make sure you understand the concepts • Anything covered in recitation

  4. What Will Not Be On The Exam? • Aspen or Mathcad problems • Dialysis problems • Problems that required very detailed calculations • Multi-part problems (like the problems on the previous exams)

  5. Concepts Covered • Chapter 2 • Phase equilibria • Plotting Txy & xy VLE data • Reading & labeling Txy, xy, Ponchon-Savarit diagrams • Lever arm rule • Define & use K values • Know how to find dew-points & bubble-points (algorithms)

  6. Concepts Covered • Chapter 3 • Describe the flash distillation process • Plot the operating line for binary flash on an xy diagram • Know how to solve sequential and simultaneous flash problems • Algorithms • Rachford-Rice & energy balances

  7. Concepts Covered • Chapter 4 • Explain how distillation works • Sketch and label the parts of a distillation column and know how the parts work • Solve external mass and energy balances

  8. Concepts Covered • Chapter 5 • Write & solve mass and energy balances for each stage in a column • Know when CMO is valid and why it is typically assumed • Use the operating equations for CMO distillation • Calculate feed quality • Find the number of stages and optimal feed stage using the McCabe-Thiele method

  9. Concepts Covered • Chapter 6 • Know what total reflux is and why it is useful • Know what minimum reflux is and why it is useful • Chapter 7 • Know why multicomponent distillation is trial-and-error • Use assumptions to solve external mass and energy balances for multicomponent distillation

  10. Concepts Covered • Chapter 9 • Know when the Fenske equation can be used • Use the Fenske equation to compute Nmin, NF,min, and splits of non-key components • Use the Underwood equations • Use the Gilliand correlation

  11. Concepts Covered • Chapter 11 • Describe how simple batch distillation works • Explain how multistage batch distillation works • List the differences between batch and continuous distillation • List advantages and disadvantages of each • Solve simple batch distillation problems • Describe how to solve multistage batch distillation problems

  12. Concepts Covered • Chapter 12 • Describe different types of trays, listing advantages and disadvantages for each • Discuss the concept of efficiency • Compute the diameter of sieve and value trays • Chapter 15 • Compare and contrast adsorption and stripping operations • Compare and contrast adsorption/stripping with distillation • Describe how to use the McCabe-Thiele method for adsorption and stripping • Discuss calculation of the operating lines for adsorption/stripping

  13. Sample Questions • List the assumptions of constant molal overflow • Given a value of a, and fractional recovery, compute Nmin • Compute the top and bottom operating lines (given sufficient information) • Identify features of Txy and xy phase diagrams • Use a Ponchon-Savarit diagram to find the enthalpy and composition of the outlet streams from a flash drum • Draw operating lines and stages on a xy diagram to estimate the number of trays in a distillation column using McCabe-Thiele analysis • You can assume that the mass flow rates of the liquid and vapor streams are constant in an absorber problem when: • (a) The solute concentrations are < 10% • (b) Henry’s law is valid • (c) The solute concentrations are ~1% or less • (d) Both (b) and (c)

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