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

Eftekhardadkhah, Mona; Kløcker, Kaja Neeb; Trapnes, Helle Hofstad; Gaweł, Bartłomiej; Øye, Gisle

doi:10.1021/acs.iecr.5b04459

Cited by 21 publications

(26 citation statements)

References 34 publications

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“…This could suggest improved water solubility of the smallest compounds in the asphaltene fractions 21 . Similar observations were made previously 45 , where the amount of oxygen in the asphaltene fraction affected their water solubility.…”

Section: Produced Water Qualitysupporting

confidence: 90%

Influence of the Crude Oil and Water Compositions on the Quality of Synthetic Produced Water

2017

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Produced water originates from the crude oil production. It is a mixture of organic and inorganic compounds and its composition is highly oilfield-dependent. The present study was carried out to increase the understanding of the relations between the crude oil properties and the composition of the aqueous phase on the produced water quality. Brines with different compositions and pH levels were mixed with five crude oils. Initially, the physicochemical properties and composition of the crude oils were determined, while the quality of the synthetic produced water samples were described by parameters such as the total oil concentration and organic carbon, pH, the drop size distribution and the Sauter mean diameter. The characterization part revealed that crude oils fell into two categories: light and heavier oils. 2 Most parameters like density, viscosity, total acid number (TAN) or composition reflected this division. A similar pattern was sustained for the water quality analyses. Water produced with heavier crude oils generally contained higher concentration of emulsified oil with the biggest and most polydispersed droplets. Light oils had a tendency to create water-in-oil emulsion between the oil and water phase, which impeded the phase separation, resulting in less free water. The Sauter mean drop diameters increased with pH of the water phase. However, the presence of calcium at the highest pH decreased the droplet size and the amount of free water, compared to the brine without divalent ions, which is in agreement with the interfacial role of the naphthenic acids in the crude oil emulsions. The results showed the significance of both the water and oil composition on the quality of the produced water. This can lead to improved fundamental perception of the produced water treatment process.

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Section: Produced Water Qualitysupporting

confidence: 90%

Influence of the Crude Oil and Water Compositions on the Quality of Synthetic Produced Water

2017

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“…Nonylphenol ethoxylate at 10 mol (NPE10) with HLB 13.2 was used as a surfactant to achieve a stable direct emulsion, as described by Loh et al [ 62 ]. For stabilization, the continuous phase was prepared as a brine solution following the procedure described in Øye et al [ 63 , 64 ]. The composition of the prepared brine is shown in Table 1 .…”

Section: Methodsmentioning

confidence: 99%

Novel Bionanocompounds: Outer Membrane Protein A and Laccase Co-Immobilized on Magnetite Nanoparticles for Produced Water Treatment

et al. 2020

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The oil and gas industry generates large amounts of oil-derived effluents such as Heavy Crude Oil (HCO) in water (W) emulsions, which pose a significant remediation and recovery challenge due to their high stability and the presence of environmentally concerning compounds. Nanomaterials emerge as a suitable alternative for the recovery of such effluents, as they can separate them under mild conditions. Additionally, different biomolecules with bioremediation and interfacial capabilities have been explored to functionalize such nanomaterials to improve their performance even further. Here, we put forward the notion of combining these technologies for the simultaneous separation and treatment of O/W effluent emulsions by a novel co-immobilization approach where both OmpA (a biosurfactant) and Laccase (a remediation enzyme) were effectively immobilized on polyether amine (PEA)-modified magnetite nanoparticles (MNPs). The obtained bionanocompounds (i.e., MNP-PEA-OmpA, MNP-PEA-Laccase, and MNP-PEA-OmpA-Laccase) were successfully characterized via DLS, XRD, TEM, TGA, and FTIR. The demulsification of O/W emulsions was achieved by MNP-PEA-OmpA and MNP-PEA-OmpA-Laccase at 5000 ppm. This effect was further improved by applying an external magnetic field to approach HCO removal efficiencies of 81% and 88%, respectively. The degradation efficiencies with these two bionanocompounds reached levels of between 5% and 50% for the present compounds. Taken together, our results indicate that the developed nanoplatform holds significant promise for the efficient treatment of emulsified effluents from the oil and gas industry.

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“…Crude oil has a very complex composition and can contain a variety of species that influence their interfacial properties, such as resins, asphaltenes [16][17] , and acidic species 18 . The dissolved components in the water, partitioned from the oil phase 19 , can also adsorb at interfaces 20 and affect the coalescence process. Moreover, crude oil drops may behave differently, when subjected to subsea conditions (i.e.…”

Section: Figure 1 Typical Produced Water Treatment Processmentioning

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

Cited by 21 publications

References 34 publications

Influence of the Crude Oil and Water Compositions on the Quality of Synthetic Produced Water

Influence of the Crude Oil and Water Compositions on the Quality of Synthetic Produced Water

Novel Bionanocompounds: Outer Membrane Protein A and Laccase Co-Immobilized on Magnetite Nanoparticles for Produced Water Treatment

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

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