Effect of the Composition of Dispersion Medium on the Structural Parameters of Resins and Asphaltenes in Low-Temperature Dewaxing of Oil
M. V. MOZHAYSKAYA, G. S. PEVNEVA, V. G. SURKOV
Institute of Petroleum Chemistry, Siberian Branch of the Russian Academy of Sciences, Tomsk, Russia
Keywords: asphaltenes, resins, structural parameters, liquefied gas dewaxing
Pages: 159-165
Abstract
Changes in the structural parameters of resin and asphaltene molecules were studied depending on the composition of the dispersion medium in the process of low-temperature dewaxing of oil. Liquefied hydrocarbon gases (propane, propane/butane, and propane/pentane) were used as a dewaxing agent. Sediments formed during dewaxing are composed of hard paraffins, resins and asphaltenes. Resins and asphaltenes were investigated by means of structural group analysis (SGA) based on PMR spectroscopy data, elemental composition and molecular weight. It is shown that variations of the oil dispersion medium due to dilution with liquefied gases lead to changes in the structural parameters (molecular weight, the number of aromatic and naphthenic rings, alkyl substituents, and the number of structural blocks in the molecule) of the average molecules of resins and asphaltenes.
DOI: 10.15372/CSD2021291
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