Method for determination of content of unsaturated hydrocarbons in petroleum cuts

One of the important quality indices of petroleum products is the content of unsaturated compounds, which is determined by means of an iodometric or bromide-bromate method and is expressed as an iodine number or bromine number. These methods are time- and labor-consuming and in many instances are inadequate in sensitivity. This paper describes a new method of analysis based on the equimolecular reaction of ozone with the unsaturated components of the test product. In determining the content of unsaturated hydrocarbons, and ADS-3 double-bond analyzer as used. In order to determine the feasibility of using this method in the analysis of petroleum cuts such as naphthas, jet fuels, kerosines, etc. , the authors made up an artificial mixture consisting of C//5-C//7 alkenes, alkanes, and isoalkanes, the idividual composition of which was checked by a chromatographic method. Results show that the ozone method is sensitive down to 10** minus **1**0 mole/ml, and the reproducibility is 2%; the probable relative error of the method is 1. 5%; the time required for analysis is 10 min.