Objectives
Guidelines for Experimental Objectives
Using the continuous distillation column, produce
a distillate from a feed of 30 wt% methanol in water. The column
contains 12 real trays, a total condenser, a reboiler, and four possible
feed locations. Determine the steady state distillate composition
at total reflux. Reduce the reflux flow rate and study its effect
on distillate composition.
Specify the experimental conditions, carry out experiment
and plot the trend for five variables.
Design Objective
You are also asked to use the information obtained
in the lab to design a continuous column using similar trays to produce
a methanol 90 mole% and a water 99 mole% from a feed of 50 wt% methanol
at a flow rate of 1000 cc/m. Please specify the number of stages,
reflux ratio, feed stage and feed temperature.
Question for prelab meeting:
Can you use the McCabe-Thiele method
for the analysis and why?
Can you use Murphreee efficiency if the thermal
couple error is 10 C?
How do you determine the distillate composition
at total reflux where no distillate is produced?
What is the single most important information
determined experimentally that must be used in your design?
Prelab Guidelines
These are in addition to the standard guidelines.
Experimental Methods: Obtain at least 4 estimates on efficiency.
Expected Data: Estimate the compositions at total reflux assuming 100%
efficiency.
Hints
(1) McCabe-Thiele, Murphree, subcooled, total condenser, equimolar
overflow, mass and energy balances.
Send mail to Dr. Chen: wchen@bobcat.ent.ohiou.edu.
Prelab Report Grade Breakdown
| Prelab Discussion |
10% |
Experimental Methods/Operating Procedure |
10% |
| Experimental and Design Objectives |
10% |
Experimental Methods/Safety Concerns |
10% |
| Introduction/Experimental Plan Overview |
10% |
Expected Data and Results |
10% |
| Experimental Methods/Schematic and Description of Apparatus |
10% |
Data Analysis/Sample Calculations |
10% |
| Experimental Methods/Test Matrix |
10% |
Data Analysis/Statistical Methods |
10% |
Postlab Report Grade Breakdown
| Report Overall/Experimental Uncertainty |
10% |
Presentation of Results/
Experimental Methodology |
10% |
| Report Overall/Quantitative vs Qualitative |
10% |
Presentation of Results/
Sample Calculations |
10% |
| Report Overall/Presentation style |
10% |
Discussion/Statistical Analysis |
10% |
| Objective |
10% |
Discussion/Analysis of Trends or Anomalies |
10% |
Presentation of Results/
Actual Results |
10% |
Conclusions |
10% |
(Last modified on 9/7/04)