Evidence for the aging of wax deposits in crude oils by Ostwald Ripening
authors Coutinho, JAP; da Silva, JAL; Ferreira, A; Soares, MR; Daridon, JL
nationality International
abstract The ageing of wax deposits is known to occur in paraffinic waxes forming in pipelines and storage tanks. It is characterized by a hardening of the deposit and an increase in paraffin content. A mechanism for the ageing of deposits, based on-diffusion caused by temperature-concentration gradients within the wax, has been previously proposed. This work presents evidence indicating Ostwald Ripening to be another ageing mechanism of wax deposits. Rheology of paraffinic crudes, kept isothermally at temperatures in the neighborhood of the pour point, shows a kinetic of hardening of the oil samples. The X-ray diffraction and Cross Polar Microscopy indicate this phenomenon to be caused by an increase of the crystallites size with time. The DSC measurements support the idea that recrystallization takes place in the wax sample. The evidence gathered shows another ageing mechanism based on the recryztallization of the paraffins, such as Ostwald Ripening, to be responsible for the ageing of wax deposits besides the diffusion mechanism previously proposed.
issn 1091-6466
year published 2003
volume 21
issue 3-4
beginning page 381
ending page 391
digital object identifier (doi) 10.1081/LFT-120018527
web of science category Energy & Fuels; Engineering, Chemical; Engineering, Petroleum
subject category Energy & Fuels; Engineering
unique article identifier WOS:000182801500006
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journal impact factor 0.976
5 year journal impact factor 1.016
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