Effect of the structure of commercial poly(ethylene oxide-b-propylene oxide) demulsifier bases on the demulsification of water-in-crude oil emulsions: elucidation of the demulsification mechanism

Batista, João Vitor da Costa; Ramalho, V. S.; Lechuga, Fernanda C.; Lucas, Elizabete F.

doi:10.1590/s0100-40422010000800009

Cited by 74 publications

(56 citation statements)

References 34 publications

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“…The emulsion destabilization, an essential step for the efficient separation of water from petroleum, can be carried out by the addition of chemical substances, named demulsifiers (Ramalho et al, 2010;Kelland et al, 2009). According to Lucas et al (2009) and Pacheco et al (2011) these substances include block copolymers based on ethylene oxide and propylene oxide (PEO-b-PPO).…”

Section: Effect Of the Type Of Demulsifiersmentioning

confidence: 99%

“…The emulsification of water in oil is normally difficult due to the immiscibility between these two liquid phases. However, shear mixing imposed on the fluids during production and the existence of natural surfactants in the petroleum's composition contribute to formation of such emulsions (Sjoblom et al, 2005;Ramalho et al, 2010). Naturally occurring emulsifiers are concentrated in the higher-boiling polar fraction of the crude oil (Jones et al, 1978;Strassner, 1968;Kimbler et al, 1966;Borba, 1990;Kokal and Aljuraid, 1999;Svetgoff, 1989;Eley et al, 1998).…”

Section: Introductionmentioning

confidence: 99%

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Optimization of Demulsifier Formulation for Separation of Water From Crude Oil Emulsions

Hajivand

Vaziri

2015

Braz. J. Chem. Eng.

100

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-In this study, various water-soluble and oil-soluble demulsifiers were selected for separation of water from crude oil emulsions and their productivity measured using the Bottle-test method at 70 °C and 10 ppm concentration. The best ones among 23 demulsifiers examined through the screening process were fatty alcohol ethoxylate, triethanol amine and urea from the water-soluble group and Basororol E2032, Basorol PDB 9935 and TOMAC from the oil-soluble category. Furthermore, the present study investigated the factors effective for demulsification such as temperature, concentration, pH, salinity and modifiers. It was found that the separation improves with increasing demulsifier concentration, increasing salt content, increasing temperature up to 80 °C, keeping the pH values between 5-9. Adding solvent modifiers proved unnecessary. Two formulations were prepared based on suggested optimal concentrations of demulsifier content by experimental design using Qualitec 4 and these proved to be highly effective in treating real and synthetic emulsions.

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Section: Effect Of the Type Of Demulsifiersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optimization of Demulsifier Formulation for Separation of Water From Crude Oil Emulsions

Hajivand

Vaziri

2015

Braz. J. Chem. Eng.

100

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“…This distillation residue is called asphaltic residue. [2][3][4][5] Asphaltenes can be separated from resins by the addition of a non-polar solvent (paraffinic) such as n-pentane or n-heptane, forming precipitates that dissolve in aromatic compounds such as toluene. 6 The asphaltenes isolated are named C5I and C7I when using n-pentane and n-heptane as flocculant, respectively.…”

Section: Introductionmentioning

confidence: 99%

Separation and characterization of asphaltenic subfractions

Honse¹,

Ferreira²,

Mansur³

et al. 2012

Quím. Nova

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Recebido em 13/4/12; aceito em 2/7/12; publicado na web em 21/9/12The structure of the various asphaltenic subfractions found in crude oil was evaluated. For this purpose, C5 asphaltenes were extracted from an asphaltic residue using n-pentane as the flocculant solvent. The different subfractions were isolated from the C5 asphaltenes by the difference in solubility in different solvents. These were characterized by infrared spectroscopy, nuclear magnetic resonance, X-ray fluorescence, elementary analysis and mass spectrometry. The results confirmed that the subfractions extracted with higher alkanes had greater aromaticity and molar mass. However, small solubility variations between the subfractions were attributed mainly to the variation in the concentrations of cyclical hydrocarbon compounds and metals.

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“…Fine solids can also promote mechanical stabilization of emulsions. [3][4][5][6] The literature [7][8][9] shows that the molecular aggregates formed by asphaltenes, more so than the molecules in free form, help to stabilize W/O emulsions by forming a film or barrier at the interfaces.…”

Section: Introductionmentioning

confidence: 99%

“…This complete efficiency result was to a certain extent expected, since model systems are more easily separated than petroleum emulsions. 6 The initial stability of the model emulsion is reflected in the performance of the demulsifier: the more unstable emulsions (subfractions C5-C6 and C8-C9) were broken down faster by the demulsifiers (5 and 10 min), while it took longer (15, 20 and 30 min) longer for the demulsifiers to break down the more stable emulsions (fractions C5 and C10).…”

mentioning

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 the structure of commercial poly(ethylene oxide-b-propylene oxide) demulsifier bases on the demulsification of water-in-crude oil emulsions: elucidation of the demulsification mechanism

Cited by 74 publications

References 34 publications

Optimization of Demulsifier Formulation for Separation of Water From Crude Oil Emulsions

Optimization of Demulsifier Formulation for Separation of Water From Crude Oil Emulsions

Separation and characterization of asphaltenic subfractions

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

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