Conclusions from experiments on refinery residues

Thermogravimetry on refinery residues gives results which may be repeated (by the same analyst using the same instrument) and reproduced (by another analyst using other instruments) within acceptable tolerances as has been determined by comparative experiments. The decrease of the boiling temperatures by a considerable amount, caused by a sufficient flow rate of the inert gas through the oven, makes a simulated distillation 

The difference of 100 % minus the sum of the distillable firaction of the sample, AG400, and the coke residue, / 800 gives the percentage of the sample which can theoretically, be cracked, CR  

On the other hand, the difference of 100 % minus the sum AG300 + R800 represents the portion of the sample which may be cracked under working conditions of the cracker in the refinery (in practice) PCR  

X = 457.5 °C independent of the origin of the samples. From the derived index num- 

Correlation of the Conradson coke residue or R800 with the non-distillable part of the samples does not give significant results, nor does correlation of the reaction rate with the average molecular weight. 

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