Separation profile of model water-in-oil emulsions followed by nuclear magnetic resonance (NMR) measurements: Application range and comparison with a multiple-light scattering based apparatus

Simon, Sébastien; Pierrard, Xavier; Sjöblom, Johan; Sørland, Geir Humborstad

doi:10.1016/j.jcis.2011.01.012

Cited by 30 publications

(15 citation statements)

References 29 publications

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“…The Pulsed field gradient NMR method, that the experimental work in this article is based on, has been validated by previously mentioned research in the introduction 30,31,34 . The low field NMR instrumentation for emulsion characterization is produced by Anvendt Teknologi AS (Norway).…”

Section: Emulsion Characterization By Low Field Nmrmentioning

confidence: 97%

Demulsification of Crude Oil Emulsions Tracked by Pulsed Field Gradient (PFG) Nuclear Magnetic Resonance (NMR). Part I: Chemical Demulsification

Hjartnes

Sørland²,

Simon

et al. 2019

Ind. Eng. Chem. Res.

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Emulsified water droplets must be extracted from crude oil for economical and transport purposes, which is achievable by chemical demulsification. Four different chemicals were tested on water-incrude oil emulsions using a newly developed NMR method. Droplet size distributions were mapped at the beginning and end of experimentation. In addition, slice selections (soft RF pulses) were used to isolate the signal from residual droplets within the separated oil phase to study coalescence patterns in the emulsion bulk. The NMR could also return rapid continuous brine profiles for analysis of sedimentation rates and free water appearance kinetics. The residual water content was isolated by strong bi-polar gradient suppression, thereby allowing focus on the smaller droplets still emulsified in the top region in the brine profiles. Optimum concentrations were found for each chemical, and blends of several chemical demulsifiers were noticeably more efficient than the single component demulsifiers in this study.

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Section: Emulsion Characterization By Low Field Nmrmentioning

confidence: 97%

Demulsification of Crude Oil Emulsions Tracked by Pulsed Field Gradient (PFG) Nuclear Magnetic Resonance (NMR). Part I: Chemical Demulsification

Hjartnes

Sørland²,

Simon

et al. 2019

Ind. Eng. Chem. Res.

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“…The stability of resulting emulsions is assessed by measuring the free water appearance kinetics (bottle test). Low Field Nuclear Magnetic Resonance (LF-NMR) can also be studied [138][139][140] .…”

Section: Asphaltenes As Stabilizersmentioning

confidence: 99%

Model molecules mimicking asphaltenes

Sjöblom

Simon

2015

Advances in Colloid and Interface Science

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132

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“…The brine separation profiles were obtained by measuring the position dependent signal of the sample at short and long observation times. 16,20 By measuring the distribution of the transversal relaxation time (T2 ), the droplet sizes can be obtained. 21…”

Section: Analysis By Low Field Nmrmentioning

confidence: 99%

Enhanced sedimentation and coalescence of petroleum crude oil emulsions by the new generation of environmentally friendly yellow chemicals

Barrabino

Keleşoğlu

Eftekhardadkhah

et al. 2017

Journal of Dispersion Science and Technology

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The purpose of this study was to compare the efficiency of new chemistry yellow demulsifiers with already commercially available yellow demulsifiers in destabilizing two types of systems: petroleum crude oil emulsions and model densely packed layers (DPL). Oil-water separation was measured by low field NMR, which allows monitoring the water content in emulsion as function of the sample height and the time. Separation profiles measured by NMR depicted an increase of the free water release kinetic as the concentration of demulsifier increased, as well as the sedimentation velocity. There was no observation of DPL formation in the crude oil emulsions.4 different demulsifiers were tested on a model DPL and compared with normal crude oil emulsions. One chemical showed a higher efficiency in DPL than in crude oil emulsion. To gain more understanding on the destabilization mechanism, the interfacial rheology properties of the systems were determined. The interfacial experiments showed an increase on the elastic modulus (E'), therefore a stronger interface, as the concentration of demulsifier increased. The viscous modulus (E'') tend to reach a minimum value at low concentrations. There are differences on the experimental procedure for both techniques but the increment of the elastic modulus is not totally understood. The most important parameters were represented by Principal Component Analysis (PCA). PCA analysis did not contribute in a better characterization of the chemicals. The new generation of yellow demulsifiers has not reproduced the efficiency of commercially yellow available demulsifiers

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Separation profile of model water-in-oil emulsions followed by nuclear magnetic resonance (NMR) measurements: Application range and comparison with a multiple-light scattering based apparatus

Cited by 30 publications

References 29 publications

Demulsification of Crude Oil Emulsions Tracked by Pulsed Field Gradient (PFG) Nuclear Magnetic Resonance (NMR). Part I: Chemical Demulsification

Demulsification of Crude Oil Emulsions Tracked by Pulsed Field Gradient (PFG) Nuclear Magnetic Resonance (NMR). Part I: Chemical Demulsification

Model molecules mimicking asphaltenes

Enhanced sedimentation and coalescence of petroleum crude oil emulsions by the new generation of environmentally friendly yellow chemicals

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