Analysis of aromatic mineral oil fractions

Thus the contributions of these compounds to the specific refraction r of the fractions cancel out [cf. eqn. (71)] this is the reason that diagrams for the ring analysis of saturated mineral oil fractions based on specific refraction and molecular weight are also valid for the estimation of naphthenic rings in aromatic fractions cf. p. 24). 

For the analysis of highly aromatic oils (chromatographic concentrates, products of solvent extraction, distillation fractions of oil residues) where the ordinary analytical methods (n-d-M,v-n - d, etc.) fail, the formulas of Geelen are of great value because they allow a reasonable type-analysis of these products. When ri-aromatics are present the equations do not hold exactly however, in these cases also, the total number of aromatic rings is given in a good approximation by 

As an illustration, some data on the analysis of type concentrates obtained by chromatographic separation of a Kerex kerosine extract, are given in Table VII. 

It can be seen that the analytical results of both the methods mentioned in Table VII agree reasonably well for saturated fractions, which was to be expected for the 

ANALYSIS OF SATURATED, MONO-AROMATIC AND DI-AROMATIC TRACTIONS OBTAINED BY CHROMATOGRAPHIC SEPARATION OF A KEREX  

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