Performing Multi  Phase Mass and Energy Balances
Using thermodynamics in mass / energy balance problems means
that additional equations are available for solving the required
unknowns.
How can VLE calculations be used in mass balance
applications?
 Solve multi  component flash distillation problems

 Derive and use the lever  arm rule
 Explain and sketch the basic flash distillation process [W: Ch.
2.1]
 Derive and plot the operating equation for a binary flash
distillation on a y  x diagram [W: Ch. 2.4]
 Solve both sequential and simultaneous binary flash
distillation problems.
 Explain the difference between (and solve) binary and
multicomponent flash calculations [W: Ch. 2.5, 2.6]
 Write and solve mass and energy balances for multi  stage
distillation

 Explain the connection between column and flash distillation
processes [W: Ch. 3.1, 3.2]
 Write the mass and energy balances and equilibrium expressions
for any stage in a column [W: Ch. 3.4, 4.1, 4.2]
 Explain what constant molal overflow(CMO) is, and determine if
it is valid in a given situation [W: Ch. 4.2]
 Determine the operating equations for CMO systems [W: Ch.
4.3]
 Determine the number of stages required to achieve a
separation, using the Lewis method [W: Ch. 4.3]
 Calculate the feed quality and determine its effect on
flowrates [W: Ch. 4.4]
 Plot the feed line on a y  x diagram [W: Ch. 4.4]
 Determine the number of stages required to achieve a
separation, using the McCabe  Thiele method [W: Ch. 4.5]
 Solve total and minimum reflux problems when CMO is valid [W:
Ch. 4.5, 4.8, 4.10]
 Explain why multicomponent distillation is trial  and  error
[W: Ch. 5.1]
 Make appropriate assumptions and make external mass balances
for multicomponent distillation problems [W: Ch. 5.1]
 Perform gas  liquid(solubility) and liquid  liquid
equilibrium mass balances

 Explain what absorption and stripping do and describe a
complete gas treatment plant
 Use the McCabe  Thiele method to analyze absorption and
stripping systems for both concentrated and dilute systems
 Solve both immiscible and partially miscible extraction
problems