Characterization of Heavy Oils and Heavy Ends

Carbognani, Lante; Espidel, J.; Colaiocco, Silvia

doi:10.1007/978-1-4419-9212-3_14

Cited by 8 publications

(7 citation statements)

References 115 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The slowest soluble ones proved to be those isolated from deposits (D T9 and D S2). Hydrogen content, ,, molecular mass, aromaticity, − ,,− and aromatic condensation 2-4,37,50 have been suggested as the main parameters responsible for oil fractions unstability. Aromaticity for the asphaltene samples employed for the formerly discussed kinetic studies, was determined by published procedures .…”

Section: Resultsmentioning

confidence: 99%

“…Hydrogen content, ,, molecular mass, aromaticity, − ,,− and aromatic condensation 2-4,37,50 have been suggested as the main parameters responsible for oil fractions unstability. Aromaticity for the asphaltene samples employed for the formerly discussed kinetic studies, was determined by published procedures . When asphaltene aromaticities were plotted against solubilized amounts (Figure ), solubilization was found to depend inversely with the determined aromaticity.…”

Section: Resultsmentioning

confidence: 99%

“…Solid deposits and light-medium crude oils came either from the western Maracaibo basin or from the eastern Venezuela basin. These geographical locations have been presented elsewhere . One asphaltene sample was isolated from an extra-heavy crude from the Orinoco Oil Belt, i.e., Cerro Negro 550 °C+ vacuum residue asphaltene, formerly studied in another work …”

Section: Methodsmentioning

confidence: 99%

“…The deposits were characterized following the general isolation and analysis scheme already published. ,, Prior to dissolution experiments, the deposits were dried for at least 2 days inside a vacuum oven kept at 80 °C and 130 mmHg. The dried solids were ground and homogenized in an aghata mortar.…”

Section: Methodsmentioning

confidence: 99%

“…Sticky samples were homogenized by thorough mixing with the aid of spatulas. Asphaltenes isolation by n -heptane precipitation and crude oil characterization protocols have already been described in detail. ,, …”

Section: Methodsmentioning

confidence: 99%

See 4 more Smart Citations

Dissolution of Solid Deposits and Asphaltenes Isolated from Crude Oil Production Facilities

Carbognani

2001

Energy Fuels

View full text Add to dashboard Cite

Solid deposits that precipitate in oil production facilities are extremely complex materials. The most insoluble asphaltene fractions, inorganic species, very large alkanes, and insoluble hydrocarbon species often contribute to their formation. In this work, five dissolution techniques were explored to investigate their dissolution in organic solvents. Three of the approaches were based on common laboratory hardware designed for temperature and mixing control. The fourth was suited for operation at high pressure and temperature, enabling us to investigate the effect of these parameters on the dissolution process. The last approach was suited to carry out kinetic dissolution studies, using gravimetric and spectrophotometric quantitation techniques. A practical dissolution technique was selected among the five described above in order to perform routine analysis. Deposits solubility mappings are described, which combine solubility of solids in solvents of known aromatic contents plus the solids composition. Analysis of the information provided by these maps allows us to understand the behavior of each sample, as well as the selection of the appropriate treatment for deposit removal. Temperature was found to be the physical parameter that influences the most the dissolution phenomenon. Aromatic hydrocarbon content was a key chemical property of solvent mixtures that enhance their dissolving power, when applied to very insoluble materials. High asphaltene fraction aromaticity was observed to impair their solubility, being the determined dissolution kinetics inversely proportional to this property. Also, high asphaltene aromaticity values were found to correlate with high density and low H/C ratios.

show abstract