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 Calculations (by calculator, not Mathcad or Aspen) Test will be comprehensive

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

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)

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)

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

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

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

Concepts Covered Chapter 6 Chapter 7 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

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

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

Concepts Covered Chapter 12 Chapter 15 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

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)