Dynamic adsorption of water soluble crude oil components at air bubbles

Eftekhardadkhah, Mona; Reynders, Pieter; Øye, Gisle

doi:10.1016/j.ces.2013.06.057

Cited by 31 publications

(39 citation statements)

References 30 publications

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“…Our group has previously demonstrated the effect of the dissolved components on the air-water interface 20,[57][58] and the flotation performance 59 . In this section we discuss their influence on the coalescence between crude oil droplets.…”

Section: Dissolved Components -Model Systemsmentioning

confidence: 99%

Microfluidic tools for studying coalescence of crude oil droplets in produced water

Dudek

Bertheussen

Dumaire

et al. 2018

Chemical Engineering Science

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The major contaminant targeted during the treatment of the oilfield produced water is dispersed oil.The efficiency of most separation processes highly relies on the size of the droplets, which can be increased through coalescence. Crude oil has a complex and field-dependent composition, which can affect the interfacial properties of the drops, and consequently the merging process in different ways. This study focused on the development of microfluidic techniques for investigating coalescence between crude oil drops. The experiments were performed with six diluted crude oils and three neat oils, the latter in the presence of an oil-soluble surfactant. The composition of the water phase was systematically varied (pH, ionic composition, presence of dissolved components). In general, crude oil droplets coalesced more readily in lower or neutral pH. The addition of dissolved Fluka acids to the water phase had a unique effect on each crude oil, reflecting their composition.What is more, this effect was similar to the presence of water-soluble crude oil components in the aqueous phase. The pressure did not have a significant effect on the coalescence, which was explained by the lack of the lightest components (C1-C4) in the system. In summary, the results revealed several trends, however it was clear that the coalescence highly depended on the oil composition. This underlined the necessity for experimental methods, such as microfluidics, which allow for quick assessment of the stability of crude oil droplets.

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Section: Dissolved Components -Model Systemsmentioning

confidence: 99%

Microfluidic tools for studying coalescence of crude oil droplets in produced water

Dudek

Bertheussen

Dumaire

et al. 2018

Chemical Engineering Science

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“…As illustrated in the introduction, for decades, Eq. 12has been used by many researchers [10,[14][15][16][17]19,20,22,23,25,[27][28][29][30][31][32]34,35,37,38,40] as an easy method for determining a diffusioncontrolled adsorption process and for estimating surfactant diffusivity. A linear dependence between c(t) and t 1/2 is commonly used to determine whether an adsorption process is diffusion-controlled [8], and the surfactant diffusivity is estimated by simply linearly fitting the initial slope of the c(t) curve in the c(t)Àt 1/2 plot by setting this slope equal to 2RTC 0 ffiffiffiffiffiffiffiffiffi ffi D=p p :…”

Section: Short-time Linear Approximation Methodsmentioning

confidence: 99%

“…Due to its simplicity, this short-time linear approximation equation has been widely used to date . Specifically, many researchers [10,[14][15][16][17]19,20,22,23,25,[27][28][29][30][31][32]34,35,37,38,40] have utilized the equation to evaluate surfactant diffusivities or determine the adsorption mechanism of various systems, linearly fitting dynamic surface tension data with the short-time linear approximation equation (c vs. t 1/2 ) for specific ranges of ''short'' time intervals (generally t 1/2 = 0-5s 1/2 , but up to t 1/2 = 200s 1/2 in [22]). A detailed literature review of these diffusivities, estimated by using the short-time approximation method, is reported in Table 1.…”

Section: Introductionmentioning

confidence: 99%

A study on the method of short-time approximation – Criteria for applicability

Casandra

Ismadji

Noskov

et al. 2015

International Journal of Heat and Mass Transfer

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Despite its widespread use in the determination of adsorption mechanisms and the estimation of surfactant diffusivity, the short-time approximation method, used for linearly fitting experimental dynamic surface tension data, should be validly applied only over a very specific range of time intervals or surface pressures. Therefore, the definition of general criteria for the applicability of this method and for error evaluation in diffusivity estimations is fundamental. In this work, a theoretical numerical simulation of the short-time approximation method was conducted, and general benchmarks for its accurate utilization were investigated. Specifically, for systems assuming planar gas-liquid surfaces, diffusion-controlled kinetics and a Langmuir adsorption isotherm, simple rules were developed in terms of limiting surface pressure (p max) and dimensionless time (t ⁄ max) as a function of dimensionless surfactant concentration (C 0 /a). For values greater than the limiting (maximal) conditions, the dynamic surface tension curve deviates from the short-time approximation straight line, and thus, the corresponding linear fitting could lead to significant errors in evaluating the diffusivity. The simple criteria proposed in this study thus precisely define the range of applicability for the short-time approximation method.

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“…Both dissolved acidic and basic compounds of crude oil in salt waters have high surface activity. They had a significant effect on ST. [ 42–44 ] In continuation of their previous work, Eftekhardadkhah et al [ 45 ] investigated the pH effect on the dissolved components in the synthetic produced water samples. These samples were prepared by partitioning water‐soluble components of the crude oils.…”

Section: Introductionmentioning

confidence: 99%

“…Studies have shown that acidic and basic components as well as heteroatoms have significant water solubility. [ 44,51,52 ] These compounds have a high surface activity that can reduce ST. As the water becomes saturated with these compounds, other phenomena observed in the laboratory are affected, such as wettability alteration. Thus, the contact between the water and the oil phase which transfers organic solvent compounds from the oil to the water phase should be considered before any water injection into the reservoir.…”

Section: Introductionmentioning

confidence: 99%

Synergistic effect of salt ions and water‐soluble amphiphilic compounds of acidic crude oil on surface and interfacial tension

et al. 2021

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This study investigated the effect of solubility of amphiphilic compounds of acidic crude oil in water on the surface and interfacial tension (IFT) with NaCl, MgCl2, CaCl2, and Na2SO4 salts. Accordingly, distilled water, along with the salts mentioned in zero ionic strength up to 2 mol were put in contact with crude oil to become saturated with amphiphilic compounds. The effects of these compounds were investigated on the properties of contact water by pH, total organic carbon (TOC), FTIR (Fourier transform infrared spectroscopy), water‐air surface tension (ST), and water‐n‐decane IFT tests. The results showed that some of the organic components of crude oil, especially acidic and basic compounds, are present or soluble in water, which have a significant effect on reducing the surface and IFT. The IFT reduction of water‐n‐decane was greater than the water‐air ST system. Also, the observations showed that for both NaCl and Na2SO4 salt water, with increasing ionic strength of water, there was an optimum salinity within the range of 0.1‐0.25 mol/L for both salts with the amount of surface and IFT minimized at this point. In the other two salts, this point was delayed upon elevation of ionic strength and was observed at high salinity. In this case, divalent cations reduce tension rate compared to monovalent cations. Due to solubility of acidic and basic groups in water, pH of salt water illustrates an acidic trend. Results of the FTIR test confirmed solubility of these compounds as well.

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Dynamic adsorption of water soluble crude oil components at air bubbles

Cited by 31 publications

References 30 publications

Microfluidic tools for studying coalescence of crude oil droplets in produced water

Microfluidic tools for studying coalescence of crude oil droplets in produced water

A study on the method of short-time approximation – Criteria for applicability

Synergistic effect of salt ions and water‐soluble amphiphilic compounds of acidic crude oil on surface and interfacial tension

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