Analysis of Hydrocarbon Blends by Gas-Liquid Partition Chromatography

Abstract

satisfactorily by recrystallization. Purification of this product by chromatography on silicic acid usually resulted in the separation of a considerable amount of unreacted ketone and a low yield of the pure reagent. In the present work bromination of the ketone in the presence of a small amount of anhydrous aluminum chloride catalyst resulted in the formation of essentially no tars and gave crude p-phenylazophenacvl bro-mide in excellent yields, usually 85 to 90%, which was easily purified by recrystallization or by chromatographic techniques. LITERATURE CITED(1) Blatt, A. H., "Organic Syntheses,"

Calculation to Relative Molar Response Factors of Thermal Conductivity Detectors in Gas Chromatography.

“…As emphasized in our first publication (13), every time an addition of a structural group to a molecule causes an incremental increase of the cross section for collision, the same must be expected in general for the relative molar response. This agrees with the observation of the nearly linear increase of RMR for a homologous series (28) with molecular weight or with the effect that the integral intensities of GLC peaks measure the proportion of the weight fractions (2,6,30,33,36) of the components of a mixture if they belong to the same homologous series.…”

Rhenium as a Catalyst in Hydrocarbon Reforming Reactions

“…Because benzene was also present in the aromatic fraction, Method 1 was not precisely quantitative, but it did permit a rather rapid semiquantitative study of reaction variables. In Method 2 the quantitative results were based upon the assumption that the relative areas of the peaks gave the relative weight percentage of the components (4).…”

Response of Thermal-Conductivity Cells in Gas Chromatography

“…Although some reports suggest that the response of a cell is proportional to weight (6, 9,16,22) or mole (11,28) concentration, others state that no such simple relationship exists (14,24) and that calibration is essential. Prediction of calibration factors (6) has given only fair accuracy.…”