[논문]Desalting Behavior of Bitumen

Peñ; aloza, Isabel M.; Chauhan, Garima; de Klerk, Arno

doi:10.1021/acs.energyfuels.1c02164

Desalting Behavior of Bitumen

Energy & fuels : an American Chemical Society journal, v.35 no.19, 2021년, pp.15618 - 15627

Peñaloza, Isabel M. (Department of Chemical and Materials Engineering , University of Alberta , 9211 116th Street , Edmonton , Alberta T6G 1H9 , Canada) , Chauhan, Garima (Department of Chemical and Materials Engineering , University of Alberta , 9211 116th Street , Edmonton , Alberta T6G 1H9 , Canada) , de Klerk, Arno

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The salt content of crude oil that enters a petroleum refinery should be kept to a minimum to limit corrosion and fouling issues associated with salts. Desalting is usually performed as the first step in refining. Desalting of strong emulsion-forming crude oils, such as oil sand-derived bitumen, is more challenging. This work investigated the desalting behavior of oil sands bitumen to determine whether salts were present mainly in emulsified connate water, or whether salts were also present outside of emulsified water. A four step desalting procedure was performed and the removal of ionic species in the aqueous phase was monitored, with emphasis placed on anion quantification. With consecutive washing steps, the anion and cation concentrations did not always decrease monotonically and these observations were supported by conductivity measurements. The ratio of anions, notably carbonate/sulfate and chloride/sulfate, did not remain constant either. With repeated water washing, the pH of the aqueous phase became more acidic. The pH from the first washing step was 7.3 and with subsequent washing steps, the pH decreased, reaching as low as 4.7 in one of the experiments. The desalting behavior was therefore not consistent with a description of bitumen that retained salts only in emulsified connate water. At least some salts had to be present as solids in the bitumen to explain variability in anion ratios. It was also speculated that some salts could be present in ionic or coordination interactions with bitumen.[FIG OMISSION]

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Desalting Behavior of Bitumen

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