1.1 This method is intended for the determination of the bromine number of liquid petroleum products substantially free from butanes and butenes. It is generally applicable to liquid petroleum products that fall in the following limits:
90 Percent Distillation Point, °C Bromine Number,
Max (see Note)
Under 205 115
205 to 327 15
The bromine number does not correspond necessarily to a true content of unsaturates, since sulphur compounds and certain polycyclic aromatic hydrocarbons are reported to react with bromine.
Note — These limits are imposed since true precision of the method has been determined only up to these bromine numbers.
1.1.1 The reported behaviour of the main hydrocarbon types is as follows:
Hydrocarbon Type Level of Bromine Number Obtained
with Pure Reference Compounds
Paraffins Zero bromine number
Straight-chain olefins Theoretical
Branched-chain olefins Mostly higher than theoretical
Cyclic olefins Theoretical
Non-conjugated dienes Not assessed
Non-conjugated cyclic dienes Theoretical
Hydrocarbon Type Leυel of Bromine Number Obtained
with Pure Reference Compounds
Conjugated dienes Lower than theoretical
Aromatics with unsaturated Not assessed
side chains
Aromatics, monocyclic Zero bromine number
Aromatics, bicyclic Zero bromine number
Aromatics, polycyclic Mostly higher than theoretical
Naphthenes Zero bromine number