ChEn 2001: Material and Energy Balances, Fall 2012
Prof. Kechun Zhang, Prof. Aditya Bhan, Prof. David Flannigan
Ben Bangasser, Anudha Mittal, Boris Chernomordik
This course provides an introduction to the
ChEn 2001 Fall 2012
Due Date: 26 October 2012
Problem 1. Acetaldehyde (C2H4O) is produced by oxidation of ethane (C2H6):
C2H6 + O2
CH3CHO + H2O
Since air is supplied at 20% excess, two side reactions occur:
2C2H6 + 7O2
2CH3CHO + O2
4CO2 + 6H2O
x-y diagram for heptane and octane
Mole fraction of toluene in the liquid phase, x
ChEn 2001 Fall 2012
Due Date: 3 October 2012
Problem 1. 100 gmol/min of a gas feed stream containing 30 mol% ethane (C2H4) and 70 mol%
methane (CH4) is fed to a distillation column 1, where it is separated into an overhead product
ChEn 2001 Fall 2012
Due Date: 7 November 2012
Problem 1. Use Raoults law to construct an x-y diagram for n-heptane and n-octane at 600 mm
Hg pressure. x and y refer to the mole fraction of the more volatile component in the liquid phase
Chapter 12: Oxidation and Reduction!
p. 426 454!
Also read 4.14 (p. 147 148)!
Oxidation and Reduction!
Oxidation: loss of electrons!
Reduction: gain of electrons!
In Organic Molecules!
Oxidation: increase in the number o
In week 14 we will cover the following items:
Monday 12/3: Lecture 38
Work, heat and Energy
Problems 5 and 6 on energy balances
Wednesday 12/5: Lecture 39
Energy Balances with multiple reactions
Approximate Lecture Schedule Fall 2012:
(*)After a date indicates that you will have an assignment due that day by 6:00pm
(before the start of class) covering material from the previous lecture.
Sections from Book
Chapter 2: Acids and Bases!
p. 54 - 75
Brnsted-Lowry Acids and Bases!
Describes acidity in terms of protons (H+ - a positively charged
Brnsted-Lowry Acid: proton donor general form H-A"
Must have a proton to give up
Chapter 3: Introduction to Organic
Molecules and Functional Groups!
p. 81 - 105
What are features of organic molecules?!
C-C and C-H -bonds: strong, nonpolar and not readily
Heteroatoms: atoms other than Carbon and Hydrogen
Chapter 6: Understanding Organic
p. 196 206; 210 219!
Sections 6.1 6.5; 6.7 6.10!
Writing Organic Reactions!
Kinds of Reactions!
Substitution: an atom or group of atoms is replaced by
another atom or group of
Chapter 1: Structure and Bonding!
p. 6 - 47!
Review on your own: !
Sections 1.1 1.3, 1.7 & 1.10 (will not be covered in detail during
Electrons in the outer most shell of an atom!
Electrons available for bonding
Chapter 4: Alkanes!
p. 113 152
Hydrocarbons with only C-C and C-H sigma bonds"
Acyclic Alkanes (no rings): CnH2n+2"
Saturated Hydrocarbons because they have the maximum
number of hydrogens/carbon"
Chapter 5: Stereochemistry!
p. 159 - 189
Stereochemistry: the 3D shape of a molecule"
Why does 3D shape matter?!
Biological systems are extremely selective and can
distinguish between molecules with slight stereoch
In week 10 we will cover the following:
Monday 11/5: lecture 27
Equilibrium based separations
Examples 5.13, 5.15. and 5.16
Tuesday 11/6: Separation Recitation, Problems 5 and 6
Wednesday 11/7: Lecture 28
Adsorption, Absorption, and Extraction (End of
Adv. Phys. Chem. Lab 2009, 1, 4511.
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Department of Chemistry, 207 Pleasant Street SE, University of Minnesota Twin Cities,
Minneapolis, MN 55455
Syllabus for ChEn 2001: Material and Energy Balances, Fall 2012
ChEn 2001: Material and Energy Balances (4 credits), Fall 2012
Prof. Kechun Zhang
Office: 263 Amundson Hall
Email: [email protected]
September 10 (Lecture 3)
Material Balance and economics - atom economy and process economy
September 11 (Recitation 2):
Problems 1 and 2 in the Recitation Mass Balances
September 12 (Lecture 4)
Process Variables (Chapter 2)
September 13 (Computer
In week 4, we will cover the following items:
9/24 (Lecture 9)
Degrees of freedom with specifications/constraints on performance
Problems 3 and 5 in "Recitation Mass Balances". Please provide solution to problem 4 as well.
In week 5 we will cover the following:
Monday 10/1: Lecture 12
Examples of differential balances and extent of reaction
Tuesday 10/2: Recitation
Problems 6 and 7 in Mass Balance Recitation
Wednesday 10/3: Lecture 13
* Collect HW 4, distribute HW5
(i) For the Matlab exam, you will receive an individual email from your recitation instructor with a problem statement for your examination by 6pm next Tuesday. You need to upload your solution on Moodle by 11 PM on October 11. Please follow the instructi
In week 7 we will cover the following:
15 October: Lecture 18
Stoichiometric, percent excess, fractional conversion
16 October: Exam 1 solution
Please present the solution and the grading scheme to the students.
17 October: Lecture 19
In week 9 we will cover the following items:
10/29 Monday: Lecture 24
Mandatory Information Session on ChEn (Laura Ericksen). Count attendance.
10/30 Tuesday: Recitation Separations 1
Problems 1 and 2 in the separation recitation.
10/31 Wednesday: Lec
In week 13 we will cover the following:
Monday 11/26: Lecture 35
Steam table and calculate U and H
Tuesday 11/27: Recitation Energy Balances
Problems 1 and 2 on energy balances handout
Wednesday 11/28: Lecture 36
Changes in H and U with P, T or Phase Cha
Chapter 9: Alcohols, Ethers and
p. 312 - 349!
Ethers and Epoxides!
Ether in a three-membered ring!
Strained ring system (impacts
Nomenclature of Alcohols!
IUPAC Sufx: -
Chapter 10: Alkenes!
p. 358 - 392!
Deviation from the maximum number of hydrogens per carbon!
Max: 2n+2 !
Each pi bond or ring removed 2 Hs !
Removal of 2 hydrogens is considered
Chapter 8: Alkyl Halides and
p. 278 - 304!
Alkyl halides undergo elimination reactions with BronstedLowry bases!
Dehydrohalogenation: removal of the elements of H-X from
a molecules (a hydro