Derived index numbers for pracital application

From the arguments in chapter 4.2.3.4 it may be deduced that while the derived index numbers of chapter 4.2.3.2, such as ND, CR, CCR/ND, and R800/ND may be of theoretical interest, other index numbers are relevant to the practice of refineries, and may also be obtained by thermogravimetry (see Tables 4-20 and 4-21). 

Conradson coke residue in the simulated vacuum residue (%) residue at 800 °C in the simulated vacuum residue (%) residue in the extrapolated point of inflexion of the TGA curve in the simulated vacuum residue (%) 

The vacuum residues and bitumens (samples 1-13) no longer contain portions, which can separated by atmospheric distillation, i. e. SAR = 100 wt%, except sample 1. The four atmospheric residues (samples 14-17) possess between 92.8 and 95.25 wt% SAR. 

The residues from a cat-cracker (sample 20) and from a thermal cracker (sample 22) have been exhaustively distilled as the SAR of 100 wt% demonstrates. For the other products from conversion processes the SAR amounts to 84.25 wt% (distillate from the residue of a thermal cracker), and up to 97.4 wt% (furfural extract, sample 24). 

The SVR of the vacuum residues and bitumens (samples 2-13) has a mean x = 96.6 wt% ( y = 2.27 %). Again sample 1 stands out from this group with SVR = 82 wt%. The atmospheric residues demonstrate a mean SVR of x = 69.8 wt% ( +V= 3.74 %). For the substances from conversion processes the SVR again depends on the degree of distillation. There SVR spreads over a range from 54.5 wt% (waxy distillate, sample 23) up to 98.5 wt% (cat-cracker residue, sample 20). 

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