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A simple method is described for determining the amount of aromatic hydrocarbons in a mixture of hydrocarbons, as in the gasoline fraction of petroleum. The mixture to be analyzed is filtered through a column of solid adsorbent. An aromatic-free filtrate is obtained which contains the paraffin, naphthene, or olefin hydrocarbon which was associated in the original solution with the quanti ty of aromatic hydrocarbon which has been adsorbed. The concentration of an aromatic hydrocarbon in an unknown solu t ion is d et ermined by m eans of a calibration curve, established from experiments on known solutions which show the amount of aromatic-free fil trate produced by the standard adsorbent from solutions of various concentrations of the aromatic hydrocarbon. R esults of experiments are given for several concentrations of eight binary solutions of an aromatic h ydrocarbon with a paraffin or naphthene h ydrocarbo n and for three concentrations of a solution consisting of an aromatic hydrocarbon with a paraffin and an olefin. These experiments show that, if the temperature is controlled to wit.hin 1 0 C, the amount of aromatic hydrocarbon can be determined with an accuracy corresponding to 0.10 or less in the percentage by volume. A general procedure is given for determining the aromatic hydrocarbons in a "straight-run " gasoline and in a gasoline containing oletins.
Mair et al. (1944) studied this question.