Colloidal stability of model asphaltene-containing disperse systems

Murzakov, R. M.; Sabanenkov, S. A.; Gureev, A. A.

doi:10.1007/bf00726593

Cited by 2 publications

(1 citation statement)

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“…On the lab scale, asphaltene instability often begins with the onset of insolubility, followed by the formation of colloidal scale particles which aggregate and ultimately sediment out of solution. The time required for asphaltenes to fully separate can increase based on solvent composition, indicating that the delay of instability is possible. − However, a full characterization of asphaltene sedimentation remains to be investigated thoroughly. At the same time, measurements of both sedimentation dynamics and sedimentation equilibrium can be powerful tools for investigation.…”

Section: Introductionmentioning

confidence: 99%

Polymeric Dispersants Delay Sedimentation in Colloidal Asphaltene Suspensions

2010

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Asphaltenes, among the heaviest components of crude oil, can become unstable under a variety of conditions and precipitate and sediment out of solution. In this report, we present sedimentation measurements for a system of colloidal scale asphaltene particles suspended in heptane. Adding dispersants to the suspension can improve the stability of the system and can mediate the transition from a power-law collapse in the sedimentation front to a rising front. Additional dispersant beyond a crossover concentration can cause a significant delay in the dynamics. Dynamic light scattering measurements suggest that the stabilization provided by the dispersants may occur through a reduction of both the size and polydispersity of the asphaltene particles in suspension.

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Section: Introductionmentioning

confidence: 99%