Experiments in argon at atmospheric pressure

The experiments were performed in argon at 1 bar pressure and a gas flow rate of 5 cmVmin. Four of the 25 samples (samples 18, 23-25) show only one maximum in the temperature range from 275 °C to 400 °C, and this represents a distillation process. Fourteen samples (samples 2-13, 20-22) possess only one maximum each in the temperature range from 450 °C to 550 °C, which clearly represents a pyrolysis reaction. The remaining six samples (samples 1, 14-17, 19) show two maxima, one each in the distillation range and the pyrolysis range. The coefficients of the Arrhenius equation, activation energy E and frequency (pre-exponential) factor A are presented in Table 4-37  

Statistical evaluation of the peak maximum temperatures of the pyrolysis reaction give coefficients of variation V = 1.18 % maximum of the corresponding mean for each heating rate. Therefore the means of the peak maximum temperatures may justifiably be used to calculate the average values of the coefficients of the Arrhenius equation  

Cracking reaction Average values Activation energy = 190.6 kJ/Mol Frequency factor log A. = 13.339 min  

The arithmetical means calculated fiom the individual data of Table 4-37 are insignificantly larger in nvunber, without any significant statistical difference. But their coefficients of variation are considerably larger  

Cracking reaction Means and coefficients of variation Activation Energy = 192.2 kJ/Mol +V = 11.35 % 

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