Chemistry Reference
In-Depth Information
a
25
30
25
20
20
15
15
10
5
10
3
4
5
6
7
8
m
Max
b
12
10
70
60
8
50
6
40
4
30
20
10
2
3
4
5
6
7
8
m
Max
Fig. 25 Simulation results for the Baker Williams column for different values of the maximal
plate number in the column using (
15
)(a) and (
16
)(b) for the feed distribution of the copolymer.
The
numbers
are the considered volume element
theoretical plates in the column,
m
Max
, and the reciprocal of the nonuniformity of
the obtained fractions. The slope of this relationship was always positive and
increased with increasing number of the considered volume element. Figure
25
shows a plot of the reciprocal of the nonuniformity of the copolymer in the
corresponding volume element versus the number of theoretical plates established
in the column. The results (Fig.
25a
) obtained with the copolymer of Stockmayer
feed distribution (
15
) are very similar to those found for the fractionation of
homopolymers [
50
]; however, the slope of the curves are smaller for copolymers
than for homopolymers. The number of theoretical plates has a larger impact on the
fractionation of homopolymers than on the fractionation of copolymers. Caused by
a broader distribution of (
16
) in comparison with (
15
), the sign of slope of the
