A. Perdih
Mala vas 12, SI-1000 Ljubljana, Slovenia
 

ABSTRACT

The susceptibility for branching, Si,j, the difference-normalised difference of data for octanes, ?normi, as well as a number of additional criteria are used to judge the suitability of 24 physicochemical properties of alkanes as references for branching. The most appropriate as primary references for branching regarding these criteria seem to be ?Hf?g, Tc/Pc, and BP/Tc. They are to be used simultaneously. The following properties, Tc2/Pc, ?, and C are considered less appropriate. The other tested physicochemical properties are considered inappropriate measures of branching. From the data of ?Hf?g, Tc/Pc, and BP/Tc, reference values for branching indices are constructed, obeying the Methane-based definition as well as for those indices obeying the n-Alkane-based definition of molecular branching.