CHEG 200: Chemical Engineering Principles
Study Guide for Exam 2
Material Balances
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Select an appropriate form for the material balances, either mass, mole, or atom.
Write general forms of the total material balance and component or atom balances.
Apply assumptions, wherever appropriate, to simplify these general forms.
Write mixture equations (i.e., total amount equals the sum of component amounts).
Select a linear independent set from the balances and mixture equations.
Write composition equations (i.e., component amount equals total amount times component mass or molar
composition).
Write conversion and/or excess equations for a main chemical reaction.
Write yield and/or selectivity equations for multiple reactions.
Write additional equations based on information given in a problem statement.
Develop mathematical models using the above balances and equations.
Analyze material balance problems for single and multiple process units.
Analyze material balance problems that involve recycles and purges.
Select a basis for an amount or flow rate and be able to do scaling when appropriate.
PVT Relationships
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Sketch the PT and PVT diagrams for a typical pure component.
Identify the single phases and equilibrium phases in these diagrams.
Trace a multi-step process in both diagrams.
Label each diagram with tabular data from the literature, such as melting point, boiling point, critical
point, saturated liquid and vapor molar or specific volumes.
Apply the Antoine equation to both diagrams for vapor-liquid equilibrium.
Apply the ideal gas law to relate temperature, pressure, and molar volume.
Analyze material balance problems that incorporate PT and PVT relationships.
Vapor-Liquid Equilibrium
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Sketch the TXY and PXY diagrams for a typical, binary vapor-liquid system.
Identify the single phases and equilibrium phases in these diagrams.
Trace a multi-step process in both diagrams.
Label each diagram with tabular data from the literature.
Apply the reverse-lever rule in the two-phase regions of these diagrams.
Sketch the TXY and PXY diagrams for a one-condensible system.
Describe vapor-liquid equilibrium using Raoult's Law.
Derive different math algorithms such as dew point and bubble point.
Use different math algorithms in HYSYS to solve phase equilibrium problems.
Analyze material balance problems that incorporate vapor-liquid equilibrium.
Remember that any basic relationship (=) on the green "gotche" table is fair game on Exam 2.
Any function (like psat, tsat, vlet, vlevf, or vlep) can be represented by a table, graph, equations,
or computer program, in that order of complexity. Remember that a table is more accurate than a
graph, a graph is easier to use than solving equations, and equations that do not involve iteration
are to be use when a table or graph is not available. Obviously, equations with iteration and
computer programs are expected to be solved on homework problems but not on exams.
Exam 2 Study Guide
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Michael Hanyak