Isolation and characterization of low and high molecular weight acidic compounds from Cerro Negro extraheavy crude oil. Role of these acids in the interfacial properties of the crude oil emulsions

Authors
Acevedo, S Escobar, G Ranaudo, MA Khazen, J Borges, B Pereira, JC Mendez, B
Citation
S. Acevedo et al., Isolation and characterization of low and high molecular weight acidic compounds from Cerro Negro extraheavy crude oil. Role of these acids in the interfacial properties of the crude oil emulsions, ENERG FUEL, 13(2), 1999, pp. 333-335
Citations number
18
Categorie Soggetti
Environmental Engineering & Energy
Journal title
ENERGY & FUELS
ISSN journal
08870624 → ACNP
Volume
13
Issue
2
Year of publication
1999
Pages
333 - 335
Database
ISI
SICI code
0887-0624(199903/04)13:2<333:IACOLA>2.0.ZU;2-O
Abstract
Two acidic samples, A and B, were isolated from Cerro Negro extraheavy crud e oil. Sample A has a relatively low number average molecular weight (M-n = 480 Da), low aromaticity (f(a) = 15.2%), and low gamma (6.8 m Nm(-1), tolu ene-0.1 N HCl), whereas for B, these values were M-n = 1200 Da, f(a) = 20%, and gamma = 14.8 m Nm(-1). These values could be compared to those for Cer ro Negro asphaltenes under the same conditions (M-n= 5000, in toluene by VP O, f(a) = 47%, gamma = 20.9 m Nm(-1)).