Chapter 4

Example 4.2: Home Problem

The Laboratory Experiment

Here is a short movie about the use of the CSTR in the Senior Chemical Engineering Lab at the University of Michigan. You will need Quicktime to view these movies.

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(embedded, direct)

High-resolution
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This Powerpoint Presentation details the reaction being carried out in the movie.

The hydrolysis of acetic anhydride is to be carried out at 25�C.

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The water and acetic anhydride are mixed immediately before entering the reactor where the entering steam is 7.8 wt % acetic anhydride (1M) and 92.2 wt % water (51.2M). The volumetric feed rate of liquid in 0.0033 dm³/s. A one minute video clip of this experiment is given on the CDROM.

Additional Information

k'=1.97x10^-4 dm³/mol s @ 25°C with E = 12,000 cal/mol

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(a)�� What conversion can be achieved in a 1 dm³ CSTR at 25�C?

(b)�� What conversion can be achieved in a0.311 dm³ PFR?

(c)�� What time is required to achieve 80% conversion in a batch reactor?

The 460 Experiment Hydrolysis of Acetic Anhydride (AH)

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(a)�� CSTR

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1.�� Mole Balance/Design Equation

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�� Rearranging

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2.�� Rate Law

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3.�� Stoichiometry liquid v = v₀

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4.�� Combine

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5.�� Evaluate

�� The maximum available flow rate in the experiment is

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�� V = 1 dm³

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�� A.2. CSTRs in Series

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Balance on Second Reactor

(b)�� PFR

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1.�� Mole Balance/Design Equation

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2.�� Rate Law

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3.�� Stoichiometry

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4.�� Combine

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�� V = 0 X = 0

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5.�� Evaluate

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(c)� Batch Reactor

1.�� Mole Balance/Design Equation

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2.�� Rate Law

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3.�� Stoichiometry Liquid

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4.�� Combine

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5.�� Evaluate

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PFR

5.� Evaluate

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�� If v₀ = 10 m³/s

�� V = 2944 dm³

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