Isolation and characterization of natural surfactants from extra heavy crude oils, asphaltenes and maltenes. Interpretation of their interfacial tension-pH behaviour in terms of ion pair formation

dc.creatorAcevedo, Sócrates
dc.creatorEscobar, Gastón
dc.creatorGutiérrez, Luis
dc.creatorRivas, Hercilio
dc.date2015-07-21T16:50:42Z
dc.date2015-07-21T16:50:42Z
dc.date2015-07-21
dc.date.accessioned2022-10-28T01:13:53Z
dc.date.available2022-10-28T01:13:53Z
dc.identifier0887-0624
dc.identifierhttp://hdl.handle.net/10872/11555
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/4945328
dc.descriptionNatural surfactants (NS) have been isolated from extra heavy crude oils and from their asphaltene and maltene fractions. The elemental analyses and molecular weight (M,) properties and the molecular weight distribution (MWD), as well as the interfacial tension (y) behaviour (toluene solutions) with pH have been measured. The NS of crude oils (NSC) and those from asphaltenes (NSA) presented properties similar to those of asphaltenes (high M,, low H/C ratio, heteroatom content and Y-pH behaviour) whereas the NS isolated from maltenes (NSM) resembled neither asphaltenes nor resins. The Y-pH behaviour of the crude oil systems were not reproduced by their fractions (asphaltenes, maltenes, NSC, NSA or NSM ). A chemical equilibrium, based on ion pairs formed between carboxylic acids and amines, is proposed to account for the observed Y-pH changes.
dc.languageen
dc.subjectcrude oil;
dc.subjectasphaltene;
dc.subjectmaltene)
dc.titleIsolation and characterization of natural surfactants from extra heavy crude oils, asphaltenes and maltenes. Interpretation of their interfacial tension-pH behaviour in terms of ion pair formation
dc.typeArticle


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