SURFACE EFFECTS IN THE UNINHIBITED AND THE INHIBITED PYROLYSES OF ISOMERIC HEXANES: PART V. 2,2-DIMETHYL BUTANE (NEOHEXANE)

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Abstract
The rate of pyrolysis of neohexane decreases slightly with increasing S/V ratio in the pressure range of 15–100 mm at 510–530 °C. The yields of CH4, C2H6, and C3H6 increase with increasing hydrocarbon pressure while the yields of i-C4H8 and H2, which increase with increasing hydrocarbon pressure, tend to level off at higher pressures. The rest of the products are pressure independent. The nitric oxide required for maximum inhibition is 12–14 mm for hydrocarbon pressures in the range of 50–120 mm and shifts to slightly higher values for higher S/V ratios. Nitric oxide affects the product distribution slightly. The yields of CH4 and C2H4 increase while the yields of C2H6 and 2-methyl butene-2 decrease with increasing NO pressure. Surface-to-volume (S/V) ratio has no effect on the product distribution in the inhibited pyrolysis of neohexane, indicating the role of the inhibitor to be limited to the gas phase for this isomer. The analytical balance does become less complete with increasing NO pressure because of such reactions as[Formula: see text]

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