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.

Low-resolution
(embedded, direct)

High-resolution
(embedded, direct)

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.

                                     

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

                   

(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)

                                            

                                      

A

B

C

0

 

(a)   CSTR

                          

1.   Mole Balance/Design Equation

                                             

                  Rearranging

                                            

2.   Rate Law

                                     

3.   Stoichiometry liquid v = v0

                                      

                                                   

                                        

                                                              

                                                         

                                                       

4.   Combine

                                          

                                                              

5.   Evaluate

      The maximum available flow rate in the experiment is

                                         

                                                                V = 1 dm3

                           

                                                       

            A.2. CSTRs in Series

                 

Balance on Second Reactor

(b)   PFR

                                                                 

                                

1.   Mole Balance/Design Equation

                                                            

2.   Rate Law

                                                           

3.   Stoichiometry

                                                 

4.   Combine

                             

                                                         

                  V = 0   X = 0

                                                      

                                                             

5.   Evaluate

                                               

                                                       

(c)  Batch Reactor

1.   Mole Balance/Design Equation

                                                             

2.   Rate Law

                                                           

3.   Stoichiometry Liquid

                              

4.   Combine

                                      

                                                           

                                                           

5.   Evaluate

                                           

 


PFR

5.  Evaluate

   

    If v0 = 10 m3/s

    V = 2944 dm3

 

    (b), (c), (d) No answer will be given.



Back to Chapter 4