Propensity of gypsum precipitation using surface energy approach

Nikoo, Amir Hossein; Kalantariasl, Azim; Malayeri, M.R.

doi:10.1016/j.molliq.2019.112320

Cited by 29 publications

(10 citation statements)

References 59 publications

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“…Various applications of the surface energy concept have been studied in recent years that include the precipitation tendency of chemicals in aqueous/oleic media, , deposition of organic/inorganic scales, − wettability alteration, ,, and deposition propensity on heated surfaces. , This work investigates the asphaltene–dolomite molecular interactions in a model oil containing HDES as an inhibitor to discern its impact on the deposition tendency of asphaltenes on the dolomite surface. Accordingly, the interacting bodies in this work are the model oil, HDES, asphaltene, and dolomite.…”

Section: Theorymentioning

confidence: 99%

“…This term was added to the classical DLVO theory to take into consideration the effect of temperature on molecular interactions. This interaction, which is always repulsive, is independent of the interacting bodies’ properties and their distances and instead only varies with temperature: k B is the Boltzmann constant. Accordingly, the Br interaction energy takes the value of 4.1143 × 10 –21 J at room temperature, 298 K.…”

Section: Theorymentioning

confidence: 99%

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Study of Asphaltene Deposition in the Presence of a Hydrophobic Deep Eutectic Solvent Using XDLVO Theory

et al. 2021

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This study aims to theoretically investigate the performance of an ionic liquid-based hydrophobic deep eutectic solvent (HDES), methyltrioctylammonium chloride:glycerol (1:2), as an asphaltene deposition inhibitor. To do so, the concept of surface energy was implemented by applying the extended DLVO (Derjaguin–Landau–Verwey–Overbeek) theory. Accordingly, the impact of surface energy components in terms of electrostatic (EL), acid–base (AB), Lifshitz–van der Waals (LW), and Brownian (Br) interactions on the deposition process has been examined. In addition, the works of cohesion and adhesion between different interacting bodies involved in the deposition process have been determined. The results revealed that AB interactions played an essential role in the inhibition of asphaltene deposition by reducing the propensity of asphaltene toward the dolomite surface. The total interaction energy also showed that the presence of HDES would take the interaction energy of asphaltene-dolomite from attraction toward the repulsive state as much as 125%. Furthermore, the calculated works of cohesion/adhesion proved that the addition of HDES to the model oil could retard asphaltene particles’ cohesion, thus preventing them from aggregation and subsequent deposition onto the dolomite surface. It was also shown that HDES, dissolved in the model oil, would primarily be attracted by asphaltene rather than its own molecules, hence producing HDES-asphaltene conjugates in the medium. Finally, the lower affinity of asphaltenes toward the dolomite surface in the presence of HDES was confirmed using the work of adhesion. The theoretical approach, proposed in this study, can provide a guideline to evaluate the intermolecular interactions between interacting bodies during the asphaltene deposition process, including asphaltene, inhibitor, reservoir rock, and oleic medium.

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Section: Theorymentioning

confidence: 99%

Section: Theorymentioning

confidence: 99%

Study of Asphaltene Deposition in the Presence of a Hydrophobic Deep Eutectic Solvent Using XDLVO Theory

et al. 2021

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“…We assume that the only types of energies acting during the formation of a nanolayer, recalling that therefore ∆𝑤 < 0, are the Brownian surface energy and the net attractive interchange energy. The Brownian energy of a particle dispersed in a fluid equals 𝑘 𝑇 per degree of freedom [42,43]. The formation of the interfacial nanolayer is a surface phenomenon [40], which suggests two degrees of freedom.…”

Section: Interaction Energies Linked To Nanolayer Thicknessmentioning

confidence: 99%

Universal relation between the density and the viscosity of dispersions of nanoparticles and stabilized emulsions

Machrafi

2020

Nanoscale

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“…Stainless-steel surface free energy, γ s 37 [35] Dispersive component of stainless-steel surface free energy, γ d s 33.72 [36] Water surface tension, γ l 72.8 [37] Dispersive component of water surface tension, γ d l 21.8 [37] Gypsum surface free energy, γ g 37 [18] Dispersive component of gypsum surface free energy, γ d g 25.7-47.1 [37]…”

Section: Data Availability Statementmentioning

confidence: 99%

Gypsum Seeding to Prevent Scaling

2022

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Eutectic freeze crystallization (EFC) is a novel separation technique that can be applied to treat brine solutions such as reverse osmosis retentates. These are often a mixture of different inorganic solutes. The treatment of calcium sulphate-rich brines using EFC often results in gypsum crystallization before any other species. This results in gypsum scaling on the cooled surfaces of the crystallizer, which is undesirable as it retards heat transfer rates and hence reduces the yield of other products. The aim of this study was to investigate and understand gypsum crystallization and gypsum scaling in the presence of gypsum seeds. Synthetic brine solutions were used in this research because they allowed an in-depth understanding of the gypsum bulk crystallization process and scaling tendency without the complexity of industrial brines. A cooled, U-shaped stainless-steel tube suspended in the saturated solution was employed as the scaling surface. This was because a tube-shaped surface enabled the introduction of a constant temperature cold surface in the saturated solution and most industrial EFC crystallizers are constructed from stainless steel. Gypsum seeding was effective in decreasing the mass of scale formed on the heat transfer surface. The most effective seed loading was 0.25 g/L, which reduced scale growth rate by 43%. Importantly, this seed loading is six times the theoretical critical seed loading. The seeding strategy also increased the gypsum crystallization kinetics in the bulk solution, which resulted in an increase in the mass of gypsum product. These findings are relevant for the operability and control of EFC processes, which suffer from scaling problems. By using an appropriate seeding strategy, two problems can be alleviated. Firstly, scaling on the heat transfer surface is minimised and, secondly, seeding increases the crystallization kinetics in the bulk solution, which is advantageous for product yield and recovery. It was also recommended that the use of silica as a seed material to prevent gypsum scaling should be investigated in future studies.

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Propensity of gypsum precipitation using surface energy approach

Cited by 29 publications

References 59 publications

Study of Asphaltene Deposition in the Presence of a Hydrophobic Deep Eutectic Solvent Using XDLVO Theory

Study of Asphaltene Deposition in the Presence of a Hydrophobic Deep Eutectic Solvent Using XDLVO Theory

Universal relation between the density and the viscosity of dispersions of nanoparticles and stabilized emulsions

Gypsum Seeding to Prevent Scaling

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