|
|
An aqueous solution of sodium
hydroxide contains 30% NaOH by mass. It is desired to produce an
8% NaOH solution by diluting a stream of the 30% solution with a stream
of pure water. Calculate the ratios (g H20/g feed solution)
and (g product solution/ g feed solution), and determine the feed rates
of 30% solution and diluting water needed to produce 100 lbm/min
of the 8% solution.
To solve this problem first we must
1) Choose a basis for calculations.
2) Draw and label a flowchart 3) Create a table We will use a basis of 100 lbm/min of Product solution Picture the flowchart for this system. If you need some help click
on this link: mixer
definition or click button below to open a picture
of this mixer
Because we have three streams in a binary system (two components) our table will have three rows and three columns. Before we begin filling in data it is important to label the row sand
columns accordingly, this is done for you in the table below.
Now we are ready to start entering mass flow rate data. (Note: all data in the table has units of lbm/min) Begin with entering any information explicitly stated in the problem according to our chosen basis. Then proceed with mass balances on each component and an overall mass balance. Once you have completed the table, or if you get stuck and need a hint, click on the button below to check you answers. |
© 2007 Arizona Board of Regents for The University of Arizona |