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Titre du document / Document title

Molecular origins of heavy crude oil interfacial activity. Part 2: Fundamental interfacial properties of model naphthenic acids and naphthenic acids separated from heavy crude oils

Auteur(s) / Author(s)

VARADARAJ Ramesh (1) ; BRONS Cornelius (1) ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

(1) ExxonMobil Research & Engineering Company, Corporate Strategic Research, 1545 Route 22 East, Annandale, New Jersey 08801, ETATS-UNIS

Résumé / Abstract

Fundamental interfacial properties were determined at the hydrocarbon-water interface for 5β-cholanic acid, abietic acid, and three crude oil naphthenic acids separated from three naphthenic-acid-containing crude oils. Observed interfacial properties were correlated to the composition and chemical structure of crude oil naphthenic acids. Crude oil naphthenic acids are a mixture of primary, secondary, and tertiary, largely cycloparrafinic, organic acids in the molecular weight range of 250-750 amu. The percentage of primary naphthenic acids and proportion of low molecular weight naphthenic acids influence interfacial activity and emulsion stability of water-in-oil emulsions. Naphthenic acid composition and chemical structure determine the nature of molecular aggregation at the hydrocarbon-water interface and impact interfacial properties and emulsion stabilization performance. Crude oil naphthenic acids containing about 80% primary acids and a higher proportion of 250-425 molecular weight species were the most effective in reducing the interfacial tension and stabilizing water-in-oil emulsions. Medium effects on interfacial properties were investigated using a model hydrocarbon, 5:1: hexadecane:toluene, and naphthenic-acid-free crude oil as the hydrocarbon phase. Crude oil naphthenic acids reduce the interfacial tension of the naphthenic-acid-free crude oil to 18.5 dyn/cm, whereas they reduce the interfacial tension of the model oil to 28 dyn/cm. The enhanced activity of the naphthenic acids in the crude oil medium is attributed to the interaction between crude oil naphthenic acids and crude oil asphaltenes.

Revue / Journal Title

Energy & fuels    ISSN  0887-0624   CODEN ENFUEM 

Source / Source

2007, vol. 21, no1, pp. 199-204 [6 page(s) (article)] (14 ref.)

Langue / Language

Anglais

Editeur / Publisher

American Chemical Society, Washington, DC, ETATS-UNIS  (1987) (Revue)

Mots-clés anglais / English Keywords

Performance

;

Stabilization

;

Interface properties

;

Asphaltene

;

Molecular structure

;

Oil water emulsion

;

Stability

;

Water oil emulsion

;

Molecular mass

;

Organic acids

;

Chemical composition

;

Naphthenic oil

;

Hydrocarbon

;

Naphthenic acid

;

Crude oil

;

Heavy oil

;

Mots-clés français / French Keywords

Performance

;

Stabilisation

;

Propriété interface

;

Asphaltène

;

Structure moléculaire

;

Emulsion huile eau

;

Stabilité

;

Emulsion eau huile

;

Masse moléculaire

;

Acide organique

;

Composition chimique

;

Huile naphténique

;

Hydrocarbure

;

Acide naphténique

;

Pétrole brut

;

Pétrole lourd

;

Mots-clés espagnols / Spanish Keywords

Rendimiento

;

Estabilización

;

Propiedad interfase

;

Asfalteno

;

Estructura molecular

;

Emulsión aceite agua

;

Estabilidad

;

Emulsión agua aceite

;

Masa molecular

;

Acido orgánico

;

Composición química

;

Aceite nafténico

;

Hidrocarburo

;

Acido nafténico

;

Petróleo bruto

;

Petróleo pesado

;

Localisation / Location

INIST-CNRS, Cote INIST : 21106, 35400014331582.0260

Nº notice refdoc (ud4) : 18562696



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