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Asphaltenes and naphthenic acid derivatives, which are polar and surface-active species, are known to interfere with the recovery of heavy crude oil by promoting the formation of stable emulsions. In this study, previously established microemulsion phase behavior models were applied to quantify the hydrophilic–lipophilic nature of asphaltenic oils (bitumen, deasphalted bitumen, asphalt, naphthalene)...
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