Characterisation and selection of demulsifiers for water-in-crude oil emulsions using low-field 1H NMR and ESI–FT-ICR MS

Carneiro, Giovanna; Silva, Renzo C.; Barbosa, Lúcio L.; Freitas, Jair C. C.; Sad, Cristina M. S.; Tose, Lílian V.; Vaz, Boniek G.; Romão, Wanderson; Castro, Eustáquio Vinícius Ribeiro de; Neto, Álvaro Cunha; Lacerda, Valdemar

doi:10.1016/j.fuel.2014.10.020

Cited by 41 publications

(20 citation statements)

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“…Then, the relatively low boiling fraction of the mixture was distilled off by heating the resulting mixture at 105 ± 2 °C under the ambient pressure for 1 h. The residue was neutralized by NaOH solution until pH = 7.0-7.5. The obtained products (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14), which were viscous brown liquid with a specific odor, were called as demulsifiers hereinafter in this paper. The chemical composition of all the 14 demulsifiers was determined by high-performance liquid chromatography (see Tables 2 and 3).…”

Section: Obtaining Demulsifiersmentioning

confidence: 99%

“…Demulsifiers are reagents from several chemical substances (surfactants, modifiers, and solvents), developed based on the properties and components of the emulsion being separated. Thousands of patents and papers are devoted to using chemical substances and compositions for the destabilization of water-in-oil emulsion in petroleum industry [1,[5][6][7][8][9][10][11][12][13][14][15].…”

Section: ■ Introductionmentioning

confidence: 99%

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New Potential Demulsifiers Obtained by Processing Gossypol Resin

et al. 2019

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Water contained in crude oil, forms so-called water-in-oil emulsions, the presence of which negatively affects the transportation and processing of oil. Demulsifiers are the special mixtures that are used to remove water from emulsions. The present paper is devoted to obtaining the demulsifiers by catalytic acid esterification of fatty acids mixture extracted from gossypol resin with isopropanol. Fourteen mixtures, containing mainly fatty acids and their ethers, were obtained and tested for demulsifying performance by using the bottle test. The relationship of the following values with the demulsibility of final mixtures was determined: the conditions of fatty acids esterification, the content of fatty acids in the demulsifier, the relative solubility number of the demulsifier, the toluene/water dynamic interfacial tension. The following conditions of fatty acids mixture esterification provided 64.8% of water removal at the dosage of 20 ppm of demulsifier: 385 K; 4 h; H2SO4/fatty acids mixture ratio 2.5 wt.%.

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Section: Obtaining Demulsifiersmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

New Potential Demulsifiers Obtained by Processing Gossypol Resin

et al. 2019

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“…The front and back trapping voltages in the ICR cell were +0.80 V and +0.85 V, respectively, for the positive ionization mode. All mass spectra were externally calibrated using L-arginine (200-1200 m/z) after internal recalibration using the most abundant homologous alkylated compounds in each sample [7,8,40,41]. The resolving power (m/Dm 50% % 450,000, where Dm 50% is the full peak width at half-maximum peak height) and <1 ppm mass accuracy provided an unambiguous molecular formula assignment for all singly charged molecular ions.…”

Section: Ldi (+)-Ft-icr Msmentioning

confidence: 99%

Laser desorption ionization FT-ICR mass spectrometry and CARSPLS for predicting basic nitrogen and aromatics contents in crude oils

Terra

Filgueiras

Tose

et al. 2015

Fuel

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“…Hence, to prevent economic losses and operational challenges, there is a need to separate the mixture of saline water and crude oil into two separate phases in a process known as demulsification before the transport or refining of crude oil [19]. The demulsification process is often accomplished using a suitable demulsifier [20][21][22]. Several techniques for crude oil demulsification have been reported in the literature [23][24][25], and they can be grouped into three broad categories, namely, chemical, physical (mechanical, thermal or microwave, electrical, ultrasonic, and membrane), and biological [19].…”

Section: Introductionmentioning

confidence: 99%

An Overview of Recent Advances in State-of-the-Art Techniques in the Demulsification of Crude Oil Emulsions

et al. 2019

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The processing of crude oil often requires the extraction of a large amount of water. Frequently, crude oil is mixed with water to form water-in-crude oil emulsions as the result of factors such as high shear at the production wellhead and surface-active substances that are naturally present in crude oil. These emulsions are undesirable and require demulsification to remove the dispersed water and associated inorganic salts in order to meet production and transportation specifications. Additionally, the demulsification of these crude oil emulsions mitigates corrosion and catalyst poisoning and invariably maximizes the overall profitability of crude oil production. Recently, there has been growing research interest in developing workable solutions to the difficulties associated with transporting and refining crude oil emulsions and the restrictions on produced water discharge. Therefore, this paper reviews the recent research efforts on state-of-the-art demulsification techniques. First, an overview of crude oil emulsion types, formation, and stability is presented. Then, the parameters and mechanisms of emulsification formation and different demulsification techniques are extensively examined. It is worth noting that the efficiency of each of these techniques is dependent on the operating parameters and their interplay. Moreover, a more effective demulsification process could be attained by leveraging synergistic effects by combining one or more of these techniques. Finally, this literature review then culminates with propositions for future research. Therefore, the findings of this study can help for a better understanding of the formation and mechanisms of the various demulsification methods of crude oil to work on the development of green demulsifiers by different sources.

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Characterisation and selection of demulsifiers for water-in-crude oil emulsions using low-field 1H NMR and ESI–FT-ICR MS

Cited by 41 publications

References 30 publications

New Potential Demulsifiers Obtained by Processing Gossypol Resin

New Potential Demulsifiers Obtained by Processing Gossypol Resin

Laser desorption ionization FT-ICR mass spectrometry and CARSPLS for predicting basic nitrogen and aromatics contents in crude oils

An Overview of Recent Advances in State-of-the-Art Techniques in the Demulsification of Crude Oil Emulsions

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