Pentane isomerization conversion rate

The method is illustrated for the adsorption rate controlling model for n-pentane isomerization. This rate equation contains two independent variables p, and or the n-pentane conversion and the ratio hydrogen/n-pentane. In reality these experiments were not planned according to this criterion. Thirteen experiments were carried out, shown in Fig. 1. This figure shows the limits on the experimental settings, that is, it shows the so-called operability region. 

In addition, the effect of coke deposition on the acid function also supports these observations. The rate of n-pentane isomerization on catalysts coked in a commercial reactor, containing up to 14%C decreases linearly with coke content on the acid support (24). When coke content increases up to 6%, there is an increase in the yield of iso-hexanes, dnring the reforming of n-hexane. This is because, as previously mentioned, the iso-paraffins are intermediate compovmds, and as catalyst deactivates the concentration of intermediate compounds increases due to a decrease in the conversion to hydrocracking products. 

A study of the kinetics of isomerization of n-pentane at 372°C. over a platinum on alumina catalyst (0.3% platinum) has been reported by Sinfelt et al. (S4). The rate measurements were made in a flow system at low conversion levels (4-18%). The n-pentane was passed over the catalyst in the presence of hydrogen at total pressures ranging from 7.7 to 27.7 atm. and at hydrogen to n-pentane ratios varying from 1.4 to 18. Over this range of conditions the rate was found to be independent of total pressure and to increase with increasing n-pentane to hydrogen ratio (Fig. 4). The rate data were correlated by an expression of the form... 

The data given for a reaction temperature of 300°C clearly showed the mordenite catalyst to be the more active for isomerization of both the C5 and Ce fractions. Conversions quoted were precious-metal-H-mordenite C5 —65 wt %, Cq >— 15 wt % precious metal-H-Y C5 — 40 wt %, Ce 4 wt %. These data suggest that the pentane fraction may be slightly easier to isomerize over mordenite than the hexane. The equilibrium conversions to isopentane and 2,2-DMB at 300°C are in the vicinity of 65 and 18 wt %, respectively. A possible explanation is that impurities present—e.g., cyclohexane and/or benzene—aifect the rate of 2,2-DMB formation more than that of the isopentane. 

What operating temperature is required to attain 90% conversion of CO under these conditions if the reactor inlet composition is 1% CO, 10% O2, and the remainder inert. Neglect volume changes of the reaction. Sinfelt, Burwitz and Rohrer [J.B. Sinfelt, S. Hurwitz and J.C. Rohrer, J. Phys. Chem., 64, 892 (I960)] report the following rate equation for the isomerization of -pentane in a hydrogen atmosphere. 

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