Wax Segregation in Oils: A Multiscale Problem

Primicerio, Mario

doi:10.1007/978-3-642-12110-4_4

Cited by 1 publication

(1 citation statement)

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“…Thus, by fitting the curve given by (2.2) to these data, we can estimate the unknown quantities c s and K. Given a total wax concentration c , this procedure has been performed for different values of T iso and using, in particular, q = 1 and p = 3/4 (the latter comes from the assumption that the crystals have a spherical shape, see [28] for details). In order to be sure that, given T iso , the value c s were correct, it has been checked that the procedure gave the same values of c s , also for mixtures having different total wax concentrations c .…”

Section: Calorimetric Experiments On the Crystallization Kineticsmentioning

confidence: 99%

A Survey on Mathematical Modelling of Deposition in Waxy Crude Oils

Fasano

Fusi

Correra

et al. 2011

Math. Model. Nat. Phenom.

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Abstract. Waxy Crude Oils (WCO's) are characterized by the presence of heavy paraffins in sufficiently large concentrations. They exhibit quite complex thermodynamical and rheological behaviour and present the peculiar property of giving rise to the formation of segregated wax deposits, when temperature falls down the so called WAT, or Wax Appearance Temperature. In extreme cases, segregated waxes may lead to pipeline occlusion due to deposition on cold walls. In this paper we review the mathematical models formulated to describe: (i) wax cystallization or thawing in cooling/heating cycles; (ii) the mechanisms of mass transport in saturated non-isothermal solutions; (iii) the experimental device used to measure wax solubility and wax diffusivity; (iv) wax deposition in pipelines carrying a warm, wax-saturated WCO through cold regions; (v) wax deposition accompanied by gelification during the cooling of a WCO under a thermal gradient.

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Section: Calorimetric Experiments On the Crystallization Kineticsmentioning

confidence: 99%