| Autor: |
Silver, A. H., Adam, W. H., Gardner, H. M., Keily, H. J. |
| Zdroj: |
Journal of the American Oil Chemists' Society; December 1961, Vol. 38 Issue: 12 p674-677, 4p |
| Abstrakt: |
Gas-liquid chromatography has been used to estimate the mean-molecular weights of commercial alkylbenzenes of the polypropylene type. Results obtained chromatographically on samples from several sources correlate well with mean-molecular weight data determined chemically via the sulfonic acids produced from them. The chromatograms are obtained with a 200-ft. capillary column coated with Apiezon L grease. Partial resolution of the multicomponent mixtures to yield eighty to one hundred peaks, each possibly representing several components, is achieved. A plot of the logarithms of the relative retention times at the median areas of the chromatograms of narrow-cut distillation fractions of alkylbenzene vs. their known mean-molecular weights provides a linear calibrating relationship with a discontinuity at a mean-molecular weight of ca. 260. This discontinuity distinguishes ?dodecylbenzenes? from the higher molecular weight ?tetradecylbenzenes?. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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