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ASPEN PLUS SIMULATION OF DISTILLATION MODELS 135

Viewing input summary
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of the present problem (see Figure 3.37).

ire«.i uiu-y itHin bv up*- »lia .>. It.I « ll.'S'l* Sal ).i 11, 00'
Olr.ciory I Pro m (tin -Oin! .s't-t .ic.r Hut II. 1
Tin* 'SII»l1»T*("i .* UlM'M ts'w*
I -IIUVI CVfllD ILL
.ccolvi.ii>o xcow-io .Mie'-io-un 10 t
cavit 'i-. ill- - '- i-.'iM' .. :, ;
a. B»«. fV*r> ll-al Kr. Hh.Vt , c H.O,
Ml> 'w live ">!.
'nrari (oiMitilax: Mil flo"
Miiauas main unimi yxio- ikkmiu 4

tiHu« ei-» -
rmkM C!"

W'OITl Ultll'l
HWii ill wii:i
CfWuM EIMK .oio»Xo<»:
MCKMI VMB VMIK fi "IWl, ««ll "iw-.'OC.
1 ...

FIGURE 3.37
Results of the RadFrac column

TABLE 3.1
Composition (mole fraction)
Component B D
ethane 0 .996 0 .004
ethylene 0 004 0 99G
.
.
Results of the DSTWU column

TABLE 3.2
Composition (mole fraction)
Component B D
ethane 0 . 997 0 . 002
ethylene 0 .003 0 .998

From Tables 3.1 and 3.2, it is obvious that there is a little difference between the
product compositions. However, the main reason behind this fact is that the RadFrac
performs rigorous calculations, whereas the DSTWU is a shortcut model. Another
possibility is the round-off error associated in the reflux ratio and feed tray position.

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