In our previous paper,
4) a report was made on the adsorption equilibrium (x-y diagram) of binary liquid hydrocarbon mixture, i.e., toluene-n-hexane-silica gel system, and on the separation factor, α, in Eq. (1) which was determined, based on the constant adsorbed phase volume, z.
This paper deals with the adsorption fractionation of binary liquid hydrocarbon mixture with the constant separation factor, α, and adsorbed phase volume, z.
The results obtained are as follows:
(1) Based on the material balance given by Eq. (2), which is analogous to Vermeulen's constant pattern,
3) the second stage-fractionating curve may be represented by Eq. (5) or (6), where t
s' is given by
V(1-x
01)/l and xs can be calculated from Eq. (8) or (9).
(2) Experimental results obtained with toluene-n-hexane-silica gel (desorbent-methanol) system are summarized in Table 1. As shown in Fig. 3, curves derived from Eq. (17) give a good x-t' correlation over a wide range of x. Rate coefficient
Ks can be determined by Eq. (18) from the observed half-point slope (dx/dt')
x=0.5.
Rate coefficient for the first stage-fractionating curves as summarized in Table 2 have been calculated using Eq. (19) from the observed half-point slope, (du/dt')
u=0.5. Curves obtained from Eq. (12)' are in good agreement with the observed results as shown in Fig. 8.
The above-mentioned
Ks for the first-and-second stage fractionating curves are plotted against the liquid flow rate, 1/
S. In Fig. 9, these show approximately good agreement with each other.
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