Dynamic Adsorption of Organic Compounds Dissolved in Synthetic Produced Water at Air Bubbles: The Influence of the Ionic Composition of Aqueous Solutions

Eftekhardadkhah, Mona; Øye, Gisle

doi:10.1021/ef400925e

Cited by 22 publications

(26 citation statements)

References 40 publications

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“…[ 70 ] Regarding surface activity, several studies show that although small amounts of organic compounds are present in water, these soluble amphiphilic components have a considerable effect on surface/interface property. [ 43,44,54 ] Comparing the results of this work with previous research, it can be concluded that some organic compounds of crude oil are soluble in water and their amount varies according to the type of oil and polar compounds.…”

Section: Resultssupporting

confidence: 52%

“…These functionalities alongside organic tail could act as surface‐active components and affect the IFT/ST and wettability. [ 43,44,54 ] The analysis of well‐produced water shows that the most soluble components of crude oil are carboxylic acids with a low molecular weight. [ 72 ]…”

Section: Resultsmentioning

confidence: 99%

“…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%

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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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Section: Resultssupporting

confidence: 52%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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“…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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“…In a series of recent papers we have investigated the adsorption of the water-soluble crude oil components onto bubble surfaces. − It was demonstrated that the adsorption was rapid and that both the acidic and basic components in the crude oils had affinity for the bubble surfaces. However, no correlations to the total acid and base numbers of the crude oils were found.…”

Section: Introductionmentioning

confidence: 99%

Composition and Dynamic Adsorption of Crude Oil Components Dissolved in Synthetic Produced Water at Different pH Values

Eftekhardadkhah

Kløcker

Trapnes

et al. 2016

Ind. Eng. Chem. Res.

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The effect of pH on the extent and type of dissolved components in synthetic produced water samples prepared from seven crude oils was investigated. More nitrogen containing compounds, probably due to improved water solubility of pyridinic nitrogen functionalities, were seen at the low pH. The affinity of the water-soluble compounds for air–water interfaces was in most cases higher at higher pH. This was due to increased oxygen content in the water-soluble species, probably associated with carboxylic acid functionalities. Differences in the affinity of water-soluble crude oil components to gas bubbles are anticipated to influence the oil removal efficiency by gas flotation. The dynamic interfacial adsorption was followed by a maximum bubble pressure tensiometer, while the dissolved species were characterized by total organic carbon measurements, total nitrogen measurements, FT-IR spectroscopy, and UV/vis spectroscopy.

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Dynamic Adsorption of Organic Compounds Dissolved in Synthetic Produced Water at Air Bubbles: The Influence of the Ionic Composition of Aqueous Solutions

Cited by 22 publications

References 40 publications

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

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

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

Composition and Dynamic Adsorption of Crude Oil Components Dissolved in Synthetic Produced Water at Different pH Values

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