Determination of Olefins, Aromatics, Paraffins, and Naphthenes in Gasoline

Aromatics in Petroleum Fractions

“…portions of pentane and then as many 200-ml. portions of pentane as necessary (see paragraph 7) are added successively to the column to displace the nonaromatic hydrocarbon fraction from the gel, and the percolate is collected in a graduated receiver. The flow is regulated at 7 ± 1 ml.…”

Petroleum

“…The adsorption technique has been used by Dinneen (55) for the examination of naphtha derived from shale oil and Conrad (45) has modified the method of Mair to render it faster and simpler by a technique involving ultraviolet radiation and measurement of zones in the column, to avoid the necessity of refractive index determinations. Kurtz (121) analyzed gasoline for hydrocarbon types by testing distillation fractions for bromine number and solubility in a mixture of phosphorus pentoxide and strong sulfuric acid, and provided methods for, cross checking the data. Mills (166) reported refinements in this procedure for determining total aromatics plus olefins.…”

Further Elucidation of Hydrocarbon Types in Olefinic Gasoline by Mass Spectrometry.

“…A knowledge of hydrocarbon composition has become an increasingly important tool in the research on modern motor fuels. Schemes for determining four hydrocarbon types-i.e., paraffins, naphthenes, olefins, and aromatics have already been reported (8). These are based on physical property and chemical means.…”