In many hydrocarbon mixtures it is desirable not only to ascertain the total olefin concentration, but to differentiate among the olefins as to double bond position. This is particularly true in the petroleum industry where the double bond position can be related to gasoline quality. In this paper a method of differentiating alpha-olefins (of the general type R-CH=CH» or R2C=CH2) from olefins with internal double bonds (of the general type R-CH= CH-R) is discussed. The analytical technique makes use of the characteristic mono-olefin absorption bands in the 9.5 to 11.5-micron region and a silica gel adsorption technique for removing saturate and aromatic interference.Calibration curves are presented for a number of pure olefins at the characteristic wave lengths to demonstrate the absorption
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