Hexyl alcohol, dehydration

Fig. 25. Plot of parameter Ct versus pressure for n-hexyl alcohol dehydration, Eqs. (80) and (81).

Let us consider the data taken by Laible (LI) on the dehydration of normal hexyl alcohol at 450°F over a silica alumina catalyst. The single- and dualsite surface reaction controlled models applying to alcohol dehydration were discussed in Section V,A,2. We now consider, however, the functional forms given, for example, by Eq. (84), as probably being capable of describing the data, but do not restrict the Ct and C2 plots to a linear pressure dependence as before. Rather, we obtain an empirical pressure dependence from the... 

In another example, a catalytic amount of a Bronsted acid such as H3PO4 was dissolved in [NRR 3][NTf2] (R = hexyl, R = butyl) 119). The catalyst was applied for the condensation reaction of alcohols, which usually requires strongly acidic media and dehydrating conditions. The condensation of veratryl alcohol was facilitated because the water that formed was continuously removed as vapor, which assisted in driving the reaction to high yields. The product (cyclotriveratrylene) separation, however, required the addition of a co-solvent. 

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