6.1 Example 5.3 (Reklaitis)

Example 5.3 in the CENG301 text has been solved by using the Maple modules in order to demonstrate the power of Maple with chemical engineering problems. It illustrates the care taken in Maple in defining and using different types of variables. Using the start301c to define the compound names and the reactions present, Maple and the mass balance modules can be used to solve the problem.

The first step is to use start301c to define the problem:

Next, using the Maple modules, we can proceed to solve the problem:

With the initialization complete, we can define known flows:

Next we can mix the feed and the recycle stream to yield our mixed stream. show2 does not produce a perfect output since the screen is not wide enough to display the last line so Maple prints the array with any formatting.

The mixed stream enters the reactor where the reaction rate is 65% of the nitrogen in stream 2. Then, 75% of the ammonia is separated from the product stream.

Finally, we have the ability to solve for the unknowns. First, we need to set up the equations and then proceed to solve them:

The solution to the equations can thus be applied to the flow matrix:

Using show2 to clean up the answer, Maple's answer compares reasonably with the solution in Reklaitis.

Text and postscript versions of this solution can be found:

Text version : /home/ceng303/slides/ex53.txt
PS version : /home/ceng303/slides/ex53.ps