Process Dynamics and Control, 4e
4th Edition
ISBN: 9781119285915
Author: Seborg
Publisher: WILEY
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The particulate emissions were measured from a factory stack. The stack was divided into
three sectors with different cross-sectional areas. The measured velocities and particulate
concentrations were given below.
Sector
number
1
2
3
Cross-sectional
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area (m²)
(ft/s)
1.0
60
1.2
45
1.4
55
a) What is the average particulate concentration in mg/m³?
Particulate concentration
(mg/m³)
450
530
610
b) What are the particulate emissions per unit area in g/m²-s for sector number 1, 2 and 3?
c) What are the flow rates of particulates in g/s for sector number 1, 2 and 3?
2) Ammonia (NH3) is an important base, particularly in wastewaters. Consider a solution that
contains a total of 10-3 M of ammonia in water.
NH4+ = NH3 + H+
KA=10-9.3
a) Use the equilibrium expression and concept of mass balance to write an expression for
each of the following species: log [NH4*] and log [NH3].
b) Prepare a log C-pH diagram for the solution described above. Label each line on your
graph with the name of the chemical species it represents. [Notes: Your diagram should
contain 4 lines, one for each of the four species in the system. You may draw your
diagram by hand or using Excel or other software.]
c) Use your diagram to find the equilibrium pH of the solution. Use a circle or “X” to mark
your answer point on the diagram.
d) Now consider a new solution made by adding 10-3 M of NH4Cl to water. Write the
charge balance or proton condition for this solution. Use your diagram to determine the
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e) Suppose it is winter and your water…
Methylamine is used in the manufacturing of several various pharmaceutical products. Atone facility, there is a 2000 lbm tank of methylamine. If the entire tank is releasedcontinuously during a 20-minute time period, determine the concentration in ppm at adistance 1 mile directly downwind. Does this exceed published exposure limits formethylamine? Assume the release is at ground level, and it is an overcast night with a 5mph wind.
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