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- W1983455823 abstract "The separation between the saturated and olefinic groups of compounds in petroleum was improved by carrying out both adsorption and charge-transfer chromatography on a single column packed with a silica gel chemically modified with silver nitrate. The preparation of the modified silica and column conditioning were investigated in order to obtain reproducible stationary phase characteristics and chromatographic performance. Samples of light, heavy or wide-boiling-range gasolines, vacuum distillates before and after cracking, vacuum residues and various test compounds were studied with pentane as the mobile phase. The results compared favourably with those obtained with highly activated bare silicas, of specific surface area 550 and 800 m2/g or copper(II)-modified silicas, used with either n-pentane or the perfluoroalkane Fluorinert FC 72 as the mobile phase. For all the samples containing olefins, at least a baseline separation between the saturtes and the olefins was observed, while the aromatics were recovered by column back-flushing. The resolution within the olefinic group remained low, which allows more accurate quantitation. Lastly, with modified silica, the water content of the mobile phase and stationary phase is a much less critical parameter than with bare silica, for complete separation is maintained up to a water content of ca. 15 ppm in n-pentane." @default.
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- W1983455823 date "1987-06-01" @default.
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- W1983455823 title "Synthesis of silver and copper(II) silica gels for the liquid chromatograpic separation of olefinic hydrocarbons in the group analysis of light and heavy petroleum compounds" @default.
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- W1983455823 doi "https://doi.org/10.1016/s0021-9673(01)94115-9" @default.
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