2022
DOI: 10.1021/acs.energyfuels.2c02943
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Abstract: The evolution of solvent and solute diffusivity during fluid−solid phase transition was studied in model wax in ndodecane solutions in a wide concentration range. Studied systems were characterized using viscosity measurements to provide supplementary information related to wax precipitation onset, while diffusion coefficients of n-dodecane and paraffin molecules were quantified using Pulsed Field Gradient (PFG) NMR. It was revealed that above the wax appearance temperature (WAT), the Hayduk−Minhas equation ad… Show more

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Cited by 6 publications
(4 citation statements)
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“…This was confirmed by the strongly reduced mobility of solvent molecules (toluene) in Figure and . Previously, a population of wax with intermediate mobility, i.e., mobility between that of liquid and solid wax, was identified below the WAT . Several possibilities for the origin of this population have been put forward: trapping of wax molecules between the interlocking wax crystals , (illustrated in Scheme , 1a), formation of pores within the precipitated wax crystal containing less mobile wax , (illustrated in Scheme , 2a), and an amorphous, softer layer of less mobile wax surrounding the wax crystals (illustrated in Scheme , 3a).…”
Section: Resultsmentioning
confidence: 99%
See 1 more Smart Citation
“…This was confirmed by the strongly reduced mobility of solvent molecules (toluene) in Figure and . Previously, a population of wax with intermediate mobility, i.e., mobility between that of liquid and solid wax, was identified below the WAT . Several possibilities for the origin of this population have been put forward: trapping of wax molecules between the interlocking wax crystals , (illustrated in Scheme , 1a), formation of pores within the precipitated wax crystal containing less mobile wax , (illustrated in Scheme , 2a), and an amorphous, softer layer of less mobile wax surrounding the wax crystals (illustrated in Scheme , 3a).…”
Section: Resultsmentioning
confidence: 99%
“…Previously, a population of wax with intermediate mobility, i.e., mobility between that of liquid and solid wax, was identified below the WAT . Several possibilities for the origin of this population have been put forward: trapping of wax molecules between the interlocking wax crystals , (illustrated in Scheme , 1a), formation of pores within the precipitated wax crystal containing less mobile wax , (illustrated in Scheme , 2a), and an amorphous, softer layer of less mobile wax surrounding the wax crystals (illustrated in Scheme , 3a). All these mechanisms need further verification but are nevertheless considered in the following discussion of how the presence of asphaltenes and PPD can alter the wax crystal network.…”
Section: Resultsmentioning
confidence: 99%
“…Unfortunately, the air flow mode widely used in NMR probes for sample heating/cooling is highly prone to creating an inhomogeneous and unstable temperature distribution within the 5 mm NMR tube. To address this issue, a previously developed approach was used: 71 the temperature inside the probe was reached and then maintained by using the water circuit of the BCU 20 cooling unit, which provided superior temperature stability within the thick-walled quartz capillary (D in = 2 mm) and minimized the possible temperature gradients. Yet the comparatively narrow channel inside the sealed capillary hindered any potential convection processes.…”
Section: Pfg Nmr Measurements and Data Analysismentioning
confidence: 99%
“…All these negative consequences of deposit formation require remedial operations which cost significant financial expenses. For this reason, heavy component deposition, being one of the most important flow assurance problems in the petroleum industry, has been comprehensively studied for decades. , …”
Section: Introductionmentioning
confidence: 99%