Assignment # 2 (Due on Friday, February 5, 9 AM, Submit in the class)
Enthalpy-Concentration Diagram and Analytical Solution Method (Only selected problem/s will be
graded)
Problem 1.
[Hint: Solve energy balance through enthalpy-concentration diagram to o

Assignment # 2 (Due on Friday, February 5, 9 AM, Submit in the class)
Enthalpy-Concentration Diagram and Analytical Solution Method (Only selected problem/s will be
graded)
Problem 1.
[Hint: Solve energy balance through enthalpy-concentration diagram to o

ENCH 405 - Midterm Exam / Winter 2016 1
ENCH 405 - WINTER 2016 — MIDTERM EXAM W
Monday, March 7, 2016 -18hOO-19h30 (90 minutes)
a) Attempt all three (3) questions
b) Show all work for full marks.
c) Open Textbook. Closed Notes. Schulich Calculators (only)

Solution to Assignment 5
Problem 1 (Exercise 4-45)
Solution:
Exercise 8.12
Subject: Extraction of acetone (A) from water (C) by 1,1,2-trichloroethane (S) at 25oC
Given: 1,000 kg/h of 45 wt% A in C. Liquid-liquid equilibrium data. 10 wt% A in raffinate.
Fi

Solution to Assignment 3
1
Solution to Q#1
2
3
4
Solution to Q# 2
Component
Fi
zi
z i /K i
z i *K i
Ki
C3
125
0.250
2.06
0.514
0.121595
n-C4
200
0.400
0.93
0.370
0.432432
n-C5
175
500
0.350
0.52
0.182
1.07
0.673077
1.23
Therefore, the stream is part liqui

Solution to Assignment 4
Problem 1
Separation of benzene and toluene
A column at 101 kPa is to separate 30kg/h of a bubble point solution of benzene and toluene
containing 0.6 mass-fraction toluene into an overhead product of 0.97 mass fraction benzene an

Assignment # 4
(Due on Friday, Feb 26, 9 am in class)
Problem # 1
(c) Feed stage
(d) What are the flow rates and composition of the streams entering and leaving stage 2 from
top? (Hint: read the compositions from the McCabe-Thiele Diagram).
Assume total c

Assignment 5
Due on March 18 (in the class)
Problem 1
Problem 2
is to be extracted using furfural. Using Figure 4.13 (a) (see next page) calculate
Problem 3
[diagram in a rectangular coordinate system (right-triangle). Use data from exercise 8.11 (see tex

ENCH 405
HW#1 (Due date: Friday, January 29, 9 am, submit in the class).
Solve the following problems from the textbook. Only selected problem(s) will be graded.

Assignment # 3
(Due on Friday, February 12, 9 am in the class)
Multicomponent flash (Rachford-Rice Equation), Bubble and Dew Point
Problem # 1
An equimolar mixture of ethane, propane, n-butane, and n-pentane is subjected to flash
vaporization at 150F and

Solution to Assignment # 1
Solution to Question No 1
We need to maximize P by varying x with the constraint that x/(2.2+x+y) = 0.95 or equivalently,
y = 0.035x -2.2. We incorporate the constraint in the expression for P and get,
HW #1 (ENCH 405, Winter 20