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|09.05 - Fugacity and Fugacity Coefficient||Click here.||80||2||
In a contest for "the most hated word in Chemical Engineering," fugacity won by a landslide. This video (15min, uakron.edu) reviews how the term was developed and why it's not really as bad as all that. In fact, it's a nice word that sets the stage for all of phase and reaction equilibrium with a straightforward extension of the same conceptual basis to mixtures. On second thought, perhaps the power of that conceptual basis and all that it implies is what really intimidates new students. Many perspectives have been offered to help overcome the frustration that students feel toward fugacity. If you like a comic book perspective, even that is available.
1.What is the fugacity of a vapor phase component in a mixture according to Raoult's law?
|15.04 - VLE calculations by an equation of state||Click here.||80||1||
PRMix.xlsx - Tutorial on use for bubble pressure (msu.edu) (10:06)
An overview of the organization of PRMix.xlsx, and a tutorial on the strategy to solve bubble pressure problems. Example 15.6 is worked in the screencast. After watching this screencast, you should be able to also solve dew or flash problems if you think about the strategy used to solve the problem. You may also be interested in a similar presentation from U.Colorado (learncheme, 6min).
|01.2 Molecular Nature of Temperature, Pressure, and Energy||Click here.||79.2||25||
Molecular Nature of Internal Energy: Thermal Energy
|01.2 Molecular Nature of Temperature, Pressure, and Energy||Click here.||78.0282||71||
Molecular Nature of Energy and Temperature (msu.edu) (3:34)
1. A 1m3 vessel contains 0.5m3 of saturated liquid in equilibrium with 0.5 m3 of saturated vapor. Which molecules are moving slower? (a) the vapor (b) the liquid (c) they are all the same.
2. A glass of ice water is sitting in your freezer, set to 0C and fully equilibrated. Which molecules are moving slower? (a) the gas (b) the liquid (c) the solid (d) they are all the same.
3. You walk into the kitchen in the morning to get some breakfast. The ceiling fan is on. You forgot your slippers. Which one is "hotter?" (a) the floor (b) the ceiling (c) the granite counter top (d) the air in the room (e) they are all the same.
|02.01 Expansion/Contraction Work||Click here.||73.3333||3||
Vocabulary in Sections 2.1-2.3: Forms of "Work." (uakron.edu, 11 min) Making cookies is hard work. In discussing work, we develop several shorthand terms to refer to specific common situations: expansion-contraction work, shaft work, flow work, stirring work, "lost" work. These terms comprise the headings of sections 2.1-2.3, but it is convenient to discuss them all at once. The important thing to remember is that work is really just force times distance, pure and simple. The shorthand terms are not intended to complicate the discussion, but to expedite the analysis of the energy balance. Developing some familiarity with the terms related to common daily experiences may help you to assimilate this new vocabulary. Sample calculations (13min) illustrate a remarkable difference when one is faced with gas compression vs. liquid pump work.
|08.01 - The Departure Function Pathway||Click here.||73.3333||6||
Departure Function Overview (11:22) (msu.edu)
|13.05 - UNIFAC||Click here.||73.3333||6||
UNIFAC concepts (8:17) (msu.edu)
UNIFAC is an extension of the UNIQUAC method where the residual contribution is predicted based on group contributions using energy parameters regressed from a large data set of mixtures. This screecast introduces the concepts used in model development. You may want to review group contribution methods before watching this presentation.
1. What is the difference between the upper case Θ of UNIFAC and the lower cast θ of UNIQUAC?
2. Suppose you had a mixture that was exactly the same proportions as the lower right "bubble" in slide 2. Compute ΘOH for that mixture.
3. Compare your value computed in 2 to the value given by unifac.xls.
|08.02 - The Internal Energy Departure Function||Click here.||73.3333||3||
The Internal Energy Departure Function (11min, uakron.edu) Deriving departure functions for a variety of equations of state is simplified by transforming to dimensionless units and using density instead of volume. This also leads to an extra simplification for the internal energy departure function.
1. What is the value of T(∂P/∂T)V - P for an ideal gas?
|10.03 - Binary VLE using Raoult's Law||Click here.||73.3333||3||
Raoult's Law Calculation Procedures (11:45) (msu.edu)
Comprehension Questions: Assume the ideal solution SCVP model (Eqns. 2.47 and 10.8).
1. Estimate the bubble pressure (bars) of 30% acetone + 70% benzene at 333K.
|07.05 Cubic Equations of State||Click here.||73.3333||3||
Virial and Cubic EOS (11:18) (msu.edu)
1. To what region of pressure is the virial EOS limited at a given temperature? Why?