TABLE OF CONTENTS This method finds the product distribution ratio b/ d for each component in a column with known numbers of trays above and below the feed and with a known reflux ratio. The flowsketch and nomenclature appear on Figure 13.13.
An absorption factor for each component i on each tray j is defined as
| (13.131) |  |
but usually it is understood to apply to a specific component so the subscript i is dropped and the absorption factors on tray j become
| (13.132) |  |
Similarly a stripping factor for each component is defined as
| (13.133) |  |
The ratio of bottom and overhead flow rates for each component is
| (13.134) |  |
with which the individual flow rates of each component are found
| (13.135) |  |
| (13.136) |  |
The function ? and ? are defined as
| (13.137) |  |
| (13.138) |  |
| (13.139) |  |
| (13.140) |  |
The effective absorption and stripping factors in each zone are approximately
| (13.141) |  |
| (13.142) |  |
A certain number of initial estimates must be made when applying Edmister's method which are improved by iteration.
Initial estimates must be made of the top and bottom temperatures so that the A 1 and S 1 can be estimated. These estimates will be adjusted by bubblepoint calculations after b and d have been found by the first iteration.
The temperature at the feed zone may be found by taking a linear temperature gradient.
Estimates must be made of
