Why does the octane number of deheptane oil be higher than that of depentane oil?
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Why does the octane number of the reformed oil after removal of heptane be higher than that of the oil after removal of pentane? In fact, it becomes even higher after the removal of heptane since no more aromatics are present. The octane number of our pentane-removed oil is 96, while that of the heptane-removed oil is 102; therefore, it seems that the presence of aromatics should result in an octane number below 96
I think it’s because n-heptane has a higher octane rating than n-pentane, and its aromatic content is low; removing n-heptane increases the octane rating
First, both depentane oil and deheptane oil contain aromatics； Second, the definition of octane number is that the octane number of n-heptane is set at 0, and that of isooctane is set at 100. Deheptane oil is a reformate oil obtained by removing alkanes with carbon numbers below C7; therefore, its octane rating is higher than that of depentane oil.
The aromatic content at the bottom of the deheptanization tower should be very high; why is it low? Aromatic compounds have a high octane rating