Model Compounds for Asphaltenes and C80 Isoprenoid Tetraacids. Part I: Synthesis and Interfacial Activities |
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| Authors: | Erland L?ken Nordgård Johan Sjöblom |
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| Institution: | 1. Ugelstad Laboratory, Department of Chemical Engineering , Norwegian University of Science and Technology , Trondheim, Norway erlandn@chemeng.ntnu.no;3. Ugelstad Laboratory, Department of Chemical Engineering , Norwegian University of Science and Technology , Trondheim, Norway |
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| Abstract: | Three model compounds for asphaltenes and two model compounds for the C80 isoprenoid tetraacids (ARN) have been synthesized and their interfacial and solubility properties were investigated. All compounds exhibit high interfacial activities. The asphaltene models lowered the interfacial tension between toluene and pH 9 to around 5 mN/m at 12.5–35 μM and the tetraacid models gave a drop in the interfacial tension between chloroform and pH 9 to 13 mN/m at only 5 μM, which is consistent with previous findings for the natural occurring C80 tetraacids. A sudden drop in the IFT over a very narrow concentration range was observed for two of three asphaltene models. NIR spectroscopy studies indicated an aggregation most likely a result of polar and hydrogen bond interactions. The IFT results also showed different behavior with only small changes in chemical structure. The tetraacid models have similar interfacial behavior as the C80 tetraacids and will thus be suitable model compounds with their highly UV active and fluorescent properties. |
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| Keywords: | Asphaltenes interfacial tension model compounds tetraacid |
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