Effect of Demulsifier Properties on Destabilization of Water-in-Oil Emulsion

Wu, Junping; Xu, Yuming; Dąbroś, Tadeusz; Hamza, Hassan

doi:10.1021/ef030113e

Cited by 151 publications

(98 citation statements)

References 9 publications

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“…The existence of an optimal RSN in terms of dehydration performance has also been observed in other tests (Wu et al, 2003). In dehydration tests conducted on bitumen emulsions obtained from a SAGD process using commercial demulsifiers, optimal RSN ranges for the demulsifiers were also observed.…”

Section: Centrifugation Testssupporting

confidence: 64%

Breaking Water‐in‐Bitumen Emulsions using Polyoxyalkylated DETA Demulsifier

Dąbroś

et al. 2004

Can J Chem Eng

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Adding demulsifier is currently the most widely used method for breaking water‐in‐oil emulsions. Experimental demulsifiers based on DETA with various PO and EO contents were synthesized and their RSN values were determined. The dehydration efficiency of these demulsifiers was measured in diluted bitumen using both gravitational settling and centrifugation tests. The results indicate that some of the DETA products could perform potentially at least as well or better than the demulsifier currently used in a commercial plant. RSN values are correlated very well with EO and PO numbers. Optimal dehydration efficiency is in the RSN range of 18 to 22, which corresponds to a PO‐to‐EO ratio in the range of 1 to 1.8.

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Section: Centrifugation Testssupporting

confidence: 64%

Breaking Water‐in‐Bitumen Emulsions using Polyoxyalkylated DETA Demulsifier

Dąbroś

et al. 2004

Can J Chem Eng

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“…Water droplets can be removed from a continuous oil phase by several methods [12], such as chemical demulsifiers [13,14], gravity or centrifugal separation [15,16], pH adjustment and heating treatment [12,17] and membrane filtration separation [12,15]. However, nowadays one of the most effective and utilized method from viewpoint of energy efficiency is electrostatic demulsification.…”

Section: Introductionmentioning

confidence: 99%

Electro-coalescence of water drops in oils under pulsatile electric fields

Mousavi

Ghadiri

Buckley

2014

Chemical Engineering Science

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For the separation of disperesed water drops from oils an electric field may be used to enhance their coalescence. However, this process could cause some undesirable phenomena such as secondary droplets formation, reducing the separation efficiency. Here the effect of pulsatile electric fields (PEF) on the secondary droplets formation has been investigated. In the presence of a very low frequency PEF or DC electric field three distinct drop-drop and drop-interface interaction patterns are observed: complete coalescence, partial coalescence and rebound without coalescence. The first is the ideal pattern not leaving any secondary droplets. It has previously been shown that an increase in the electric field strength and/or a decrease in the interfacial tension result in non-ideal patterns in dropinterface coalescence. The application of PEF shifts the coalscence pattern from a non-ideal to an ideal one in both drop-drop and drop-interface coalescences. Three waveform types, i.e. square, sinusoidal and sawtooth waves have been applied to the coalescence process. It is shown that the sawtooth waveform is the most effective in reducing the secondary droplets formation in dropinterface coalescence, followed closely by the sinusoidal one. The observation of videos sequences suggests that a threshold frequency exists above which a non-ideal pattern switches to an ideal one. For drop-drop coalescence this threshold frequency depends on the PEF amplitude and the size of primary drop pairs, as for bigger primary drop pairs and larger amplitudes of PEF the threshold frequency would be higher. When using pulsatile electric fields higher field strengths can be applied for systems having a high water content without causing field breakdown, as compared to constant DC field. This is useful in optimizing the electro-coalescence process.

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“…18 The hydrophilic part includes the oxyethylene, hydroxyl, carboxyl or amine groups, while the hydrophobic parts are composed of alkyl, alkylphenol or oxypropylene groups. 19,20 Among the commercial demulsifiers are ethoxylated phenol-formaldehyde resins and poly(ethylene oxide)-poly(propylene oxide) (PEO-PPO) block copolymers. [21][22][23][24] Among the properties desired of demulsifiers are high adsorption speed at the water-oil interface, displacement of the natural emulsifiers that stabilize the emulsions and formation of thin and fragile films at the water-oil interface, facilitating coalescence of the droplets.…”

Section: Introductionmentioning

confidence: 99%

The influence of asphaltenes subfractions on the stability of crude oil model emulsions

Honse¹,

Mansur²,

Lucas³

2012

J. Braz. Chem. Soc.

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O petróleo é produzido na forma de emulsão água em óleo e os asfaltenos são considerados os principais responsáveis pela estabilização dessas emulsões. O objetivo deste trabalho foi avaliar a influência de diferentes frações asfaltênicas sobre a estabilidade de emulsões modelo de petróleo (salmoura em asfaltenos/tolueno) e sobre a eficiência de desemulsificantes. A estabilidade das emulsões foi acompanhada pelo ensaio de garrafa, com e sem a adição de desemulsificante. Os resultados mostram que a amostra de asfaltenos com larga distribuição de polaridade promove maior estabilidade da emulsão do que a amostra com distribuição mais estreita e polaridade intermediária. Além disso, a eficiência do desemulsificante na separação das emulsões está diretamente relacionada à estabilidade original da emulsão. Resultados de tensão interfacial evidenciaram a eficiência de deslocamento dos asfaltenos pelos tensoativos desemulsificantes, o que ocorreu com maior eficiência para as emulsões contendo frações de asfaltenos com distribuição estreita e polaridade intermediária.Crude oil is produced as water-in-oil emulsion, and asphaltenes have been considered the main responsible by their stabilization. The aim of this work was to evaluate the influence of the asphaltenes subfractions on the stability of petroleum model emulsions and on the efficiency of demulsifiers. Model water-in-oil emulsions were prepared: aqueous phase of brine and oil phase of asphaltenes in toluene. Different asphaltenes fractions were used. The emulsions' stability was assessed by the bottle test, with and without adding demulsifier. The results show that a sample of asphaltenes with broad polarity distribution promotes greater emulsion stability than a sample with narrow distribution and intermediate polarity. Besides this, the efficiency of demulsifiers in separating the emulsions is directly related to the original stability of the emulsion. Measurements of the interfacial tension revealed the efficiency of displacement of the asphaltenes by the demulsifiers, which occurred more efficiently for the emulsions containing asphaltenes fractions with narrow distribution and intermediate polarity.

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Effect of Demulsifier Properties on Destabilization of Water-in-Oil Emulsion

Cited by 151 publications

References 9 publications

Breaking Water‐in‐Bitumen Emulsions using Polyoxyalkylated DETA Demulsifier

Breaking Water‐in‐Bitumen Emulsions using Polyoxyalkylated DETA Demulsifier

Electro-coalescence of water drops in oils under pulsatile electric fields

The influence of asphaltenes subfractions on the stability of crude oil model emulsions

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