Analysis of paraffin precipitation from petroleum mixtures by means of DSC: Iterative procedure considering solid–liquid equilibrium equations

Coto, Baudilío; Martos, Carmen; Espada, Juan J.; Robustillo, María Dolores; Peña, José L.

doi:10.1016/j.fuel.2009.12.010

Cited by 50 publications

(62 citation statements)

References 26 publications

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“…DSC calibration was carried out by using pure n‐alkane within the range of n‐C 7 to n‐C 18 , thus covering a temperature range between −90 and 30°C. The obtained results suggest the possibility to linearly correlate the pure n‐alkane melting temperature determined by DSC and the reference values .…”

Section: Methodsmentioning

confidence: 75%

Experimental study of the effect of inhibitors in wax precipitation by different techniques

Coto

Martos

Espada

et al. 2014

Energy Science & Engineering

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The blocking problems in equipment and flowlines caused by precipitation of wax solids is a well-known problem and large research efforts have been focused on developing procedures dealing with wax deposition. Among the different alternatives, the use of chemicals is frequently used to inhibit wax precipitation. The presence of these compounds modifies the size and/or the shape of the paraffinic solids, thus affecting their flow behavior and cold properties. In this work, a methodology based on different experimental techniques was developed to study the effect of different additives on the crude oil behavior at low temperature. Four commercial inhibitors were added to three crude oils in different concentrations. The effect of the inhibitors on wax precipitation was studied using differential scanning calorimetry (DSC) and cross-polarized microscopy (CPM). Obtained results for wax appearance temperature (WAT) using DSC do not show remarkable differences regarding the presence of inhibitor. However, CPM analyses revealed differences in both size and shape of paraffin solids. The results obtained in this work reveal that in some cases the inhibitor does not modify the WAT values, but the morphology of the precipitated particles. In these cases, it is necessary to combine DSC and CPM analyses to obtain reliable results.

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Section: Methodsmentioning

confidence: 75%

Experimental study of the effect of inhibitors in wax precipitation by different techniques

Coto

Martos

Espada

et al. 2014

Energy Science & Engineering

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“…The interaction energy between two non-identical molecules is given by: jj ji ij λ λ λ = = (15) where j is the n-alkane with the shorter chain of the pair ij.…”

Section: Predictive Wilson Modelmentioning

confidence: 99%

“…For example, Coto et al [15] checked a procedure to study wax precipitation from petroleum mixtures based on the use of DSC technique. Their method yielded WAT, the wax precipitation curve and wax composition.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation and thermodynamic modeling of wax disappearance temperature for n-undecane+n-hexadecane+n-octadecane and n-tetradecane+n-hexadecane+n-octadecane ternary systems

Aftab

Javanmardi

Nasrifar

2015

Fluid Phase Equilibria

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“…However, there is a peak of crystallization near 14.2 °C, attributed to waxes that are indicated as heavy hydrocarbons (C20-C60) composed of linear n-alkanes 16 which are commonly present in crude oils. 17 The DSC curve of biodiesel shows crystallization peaks close to -7 °C and -61.0 °C that represent saturated and unsaturated methyl esters respectively.…”

Section: Thermal Methodsmentioning

confidence: 99%

Measuring the Light Crude Oil (Lco) Content in Standard Biodiesel/Lco Blends by Thermal Analysis

et al. 2018

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The goal of the present study was to determine the potential use of thermal analysis for the measurement of the light crude oil (LCO) content of standard biodiesel mixtures. Standard samples of biodiesel/LCO blends were prepared with different ratios of biodiesel; LCO: 1:0 (biodiesel only), 1:3, 1:1, 3:1, 0:1 (LCO only). Thermogravimetry (TG) and differential scanning calorimetry were used to determine the usefulness of thermal analysis for quantification of the LCO in the mixtures. Proton nuclear magnetic resonance ( 1 H NMR) spectroscopy was also used to confirm the composition of the samples. It was found that thermogravimetric curves were not appropriate for the LCO measurements. However, the DSC signal of wax crystallization exhibited a good linear (R 2 = 0.99) correlation with the LCO content in the blend. Furthermore, it was shown that aliphatic protons (-CH 2 -) n in biodiesel and light crude oil can also be used to determine LCO in biodiesel/LCO blends.

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Analysis of paraffin precipitation from petroleum mixtures by means of DSC: Iterative procedure considering solid–liquid equilibrium equations

Cited by 50 publications

References 26 publications

Experimental study of the effect of inhibitors in wax precipitation by different techniques

Experimental study of the effect of inhibitors in wax precipitation by different techniques

Experimental investigation and thermodynamic modeling of wax disappearance temperature for n-undecane+n-hexadecane+n-octadecane and n-tetradecane+n-hexadecane+n-octadecane ternary systems

Measuring the Light Crude Oil (Lco) Content in Standard Biodiesel/Lco Blends by Thermal Analysis

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