Process Dynamics and Control, 4e
4th Edition
ISBN: 9781119285915
Author: Seborg
Publisher: WILEY
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Chapter 2, Problem 2.10E
Interpretation Introduction
Interpretation:
The response for the change in the input flow for the stirred tank blending system of example 2.1 of the textbook is to be plotted for the two given conditions.
Concept introduction:
For chemical processes, dynamic models consisting of ordinary differential equations are derived through unsteady-state conservation laws. These laws generally include mass and energy balances.
The process models generally include algebraic relationships which commence from
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5. Look at Figure 7-14. Determine the voltage developed between the steel nozzle and the
grounded vessel, and how much energy is stored in the nozzle. Explain the potential
hazards for cases A and B from the following table:
Case A
Case B
Hose length (ft)
75
75
Hose diameter (in)
2.0
2.0
Flow rate (gpm)
30
30
Liquid conductivity (mho/cm)
2x10-8
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0.8
0.9
6. In Problem 5, case B, what would be the most effective way to reduce the potential
hazards in this situation?
2. You have decided to use a vacuum purging technique to purge oxygen from a reactor
vessel to reduce the concentration to 2.0% (mol). The reactor is 18 ft diameter and 40 ft
tall. The temperature is 80°F. Assume that the vacuum purge goes from atmospheric
pressure to 10.0 psia. How many purge cycles are required and how many total moles of
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An 8-foot ion exchange bed needs to be backwashed with water to remove impurities. The particles have a density of 1.24 g/cm³ and an average size of 1.1 mm.
Calculate:
a. The minimum fluidization velocity using water at 30°C?
b. The velocity required to expand the bed by 30%?
Assumptions: The ion exchange bed particles are spherical (sphericity = 1.1), and the minimum fluidization porosity (ɛM) is 0.3.
Notes:
At 30°C, the viscosity (μ) of water is 0.797 cP, and the density (ρ) is 0.995 g/cm³.
Chapter 2 Solutions
Process Dynamics and Control, 4e
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