Investigations into asphaltenes in heavy crude oils. I. Effect of temperature on precipitation by alkane solvents

Ali, Latif H.; Al-Ghannam, Khalid A.

doi:10.1016/0016-2361(81)90047-8

Cited by 72 publications

(27 citation statements)

References 6 publications

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“…In the propane-deasphalting process, the amount of asphaltene precipitated may rise as temperature increases. However, for normal-alkane diluents with carbon number above 5, the precipitated amount falls with increasing temperature (Fuhr et al, 1991;Ali and Al-Ghannam, 1981). Concerning the effect of pressure on asphaltene precipitation, if the pressure is higher than the bubble-point pressure of the crude oil, rising pressure raises the solubility of asphaltenes in the crude oil; on the other hand, below the bubble-point pressure, a reduction of pressure enhances solubility of asphaltenes (Hirschberg et al, 1984;Burke et al, 1990).…”

Section: Aiche Journalmentioning

confidence: 95%

Molecular‐thermodynamic framework for asphaltene‐oil equilibria

1998

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Section: Aiche Journalmentioning

confidence: 95%

Molecular‐thermodynamic framework for asphaltene‐oil equilibria

1998

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“…Also asphaltenes are known to have a high molecular weight and number of polar oil components (Ali and Al-Ghannam 1981;Hirschberg et al 1984;Speight 1999). …”

Section: Introductionmentioning

confidence: 99%

Investigation of asphaltene deposition under dynamic flow conditions

Salimi

Abdollahifar

2016

Pet. Sci.

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Asphaltene deposition is one of the most serious problems, which usually occurs in oil wells, petroleum production, oil processing, and transportation facilities. Deposition of heavy organic components, especially asphaltene, can lead to wellbore blockage and impacts well economics due to reduction in oil production. Therefore, it is necessary to pay more attention to finding some solution to overcome this problem. In this study, a pipe-loop apparatus for investigation of oil stability was employed to measure deposition thickness using a thermal method. The effects of many factors such as oil type, oil temperature, oil velocity, inhibitors, and solvents on asphaltene deposition were investigated. The results showed that the deposition increased with the increasing value of the colloidal instability index. Besides, the deposition thickness increased with the decreasing velocity of oil, but did not change with oil temperature. In addition, n-heptane could result in more deposition; however, toluene had no effect on the deposition. Branched dodecyl benzene sulfonic acid (Branched DBSA) and Linear DBSA as inhibitors decreased the rate of asphaltene deposition.

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“…The asphaltene fraction is composed of the heaviest components in crude oils. Separated solid asphaltenes usually appear brown to black and have no definite melting point but decompose when the temperature exceeds 300-400 o C. It has been shown that changes in temperature [24,25], pressure [26][27][28] and oil composition [29] can cause asphaltene precipitation. Asphaltenes are flat sheets of condensed polyaromatic hydrocarbons interconnected with sulfide, ether, aliphatic chain, and naphthenic ring linkages [30,31].…”

Section: Surface-active Species In Crude Oilmentioning

confidence: 99%

Experimental and modeling approach to study separation of water in crude oil emulsion under non-uniform electrical field

Alinezhad

Hosseini

Movagarnejad

et al. 2010

Korean J. Chem. Eng.

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In many ways, the use of high electrostatic fields in the separation of water-in-oil emulsions is a mature technology, with most developments arising from attempts to improve the process of crude oils, in terms of the separation of water, salt or other hydrophilic impurities. In this way, different mechanisms have been proposed until now and several parameters have been studied to estimate the level of separation. In this work, after a review of the process and its application, new results are presented for AC currents under non-uniform electrical fields (dielectrophoresis) on the water-in-crude oil emulsion. Then the effects of voltage, temperature, volume fraction and API are studied on degree of separation. Finally, a correlation is presented among these parameters by an experimental model.

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Investigations into asphaltenes in heavy crude oils. I. Effect of temperature on precipitation by alkane solvents

Cited by 72 publications

References 6 publications

Molecular‐thermodynamic framework for asphaltene‐oil equilibria

Molecular‐thermodynamic framework for asphaltene‐oil equilibria

Investigation of asphaltene deposition under dynamic flow conditions

Experimental and modeling approach to study separation of water in crude oil emulsion under non-uniform electrical field

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