Adsorption of hybrid polyacrylamides on anisotropic kaolinite surfaces: Effect of polymer characteristics and solution properties

Alagha, Lana Z.; Guo, Lijia; Ghuzi, Mohammed; Molatlhegi, Ontlametse; Xu, Zhenghe

doi:10.1016/j.colsurfa.2016.03.031

Cited by 26 publications

(9 citation statements)

References 28 publications

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“…KL had the lowest adsorbed mass and thickness at all concentrations when compared with SBL and SML, implying the limited affinity of KL for adsorption on the surface at pH 7.8. For all concentrations, the adsorbed mass and thickness for SBL were higher than SML confirming that the higher molecular weight lignin derivative adsorbed more than the lower molecular weight one on the surface [ 44 , 45 ]. The maximum mass uptakes for both SBL and SML (74.71 ng/cm 2 and 49.54 ng/cm 2 , respectively) were observed at the concentration of 500 mg/L, and this concentration was considered as the saturation concentration for the adsorption of both lignin derivatives onto the Al 2 O 3 surface.…”

Section: Resultsmentioning

confidence: 99%

“…The slope in the reorientation step of SML was steeper than the slope for SBL, illustrating that the molecules of SML exhibited a more extended configuration from the surface forming a more irregular layered film [ 35 ], presumably due to higher hydrophilicity of SML. In the saturation region of SML adsorption, a smaller slope, K 3 , was observed ( Table S4 ), due to the departure of entrapped water molecules from the adlayer by adsorbed polymer molecules as the adsorption continued leading to a more compact film on the surface [ 44 ].…”

Section: Resultsmentioning

confidence: 99%

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Using Sulfobutylated and Sulfomethylated Lignin as Dispersant for Kaolin Suspension

Hopa

Fatehi

2020

Polymers

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Kraft lignin is an abundant natural resource, but it is underutilized. In this study, sulfoalkylated lignin derivatives with similar charge densities but with different alkyl chain length were produced via sulfobutylation and sulfomethylation reactions. The contact angle studies revealed that sulfobutylated lignin (SBL) with longer alkyl chains had a higher hydrophobicity than sulfomethylated lignin (SML) did. The adsorption behavior of sulfoalkylated lignins was studied using a Quartz crystal microbalance with dissipation (QCM-D) on Al2O3 coated surface as representative of positively charged sites of kaolin particles. The results of adsorption studies showed that SBL deposited more greatly than SML did on the Al2O3 surface, and it generated a thicker but less viscoelastic adlayer on the surface. The adlayer thickness and configuration of molecules on the surface were also related to the zeta potential and stabilization performance of the polymers in the kaolin suspension system. The results also confirmed that both lignin derivatives were very effective in dispersing kaolin particles at neutral pH, and their effectiveness was hampered under alkaline or acidic pH.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Using Sulfobutylated and Sulfomethylated Lignin as Dispersant for Kaolin Suspension

Hopa

Fatehi

2020

Polymers

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“…The nature of solid wettability is closely associated with its surface composition . The low percentages of surface carbon and sulfur as well as the high contents of silicon and aluminum engender hydrophilic solids that unblock the bitumen extraction.…”

Section: Resultsmentioning

confidence: 99%

Understanding the Properties of Bitumen Froth from Oil Sands Surface Mining and Treatment of Water-in-Oil Emulsions

et al. 2021

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Bitumen froth, as the crude product from the surface mining of oil sands, requires the efficient removal of water and solids for further processing. This work has systematically characterized the properties of bitumen froth from an oil sands operation in Northern Alberta and their correlation to the froth treatment efficiency (i.e., removal of water and demulsification behaviors). Systematic characterization was performed regarding the composition, wettability, and particle size distribution of the solids separated from different phases (i.e., diluted bitumen, aqueous phase, and coarse solids). Multiscale analyses including Xray photoelectron spectroscopy (XPS), scanning electron microscopy coupled with energy dispersive X-ray spectroscopy (SEM/ EDX), X-ray powder diffraction (XRD), and elemental analysis were employed to analyze the surface and bulk chemistry of the solids. The results indicate that a great amount of toluene-soluble and toluene-insoluble organics are discontinuously adsorbed on the solid surfaces, making the solid biwettable with a water contact angle of around 90°. The biwettable and fine solids are apt to remain at the oil/water interface or are trapped between the oil droplets, strengthening the "protective" interfacial film, which contributes to the formation of rag layer. The fine and ultrafine solids with a surface coating of organics remain with bitumen and adversely influence the quality of the separated bitumen. The organiccoated coarse solids precipitate toward the bottom, reducing the overall bitumen recovery. In addition, a trace amount of the organics could be firmly adsorbed on the solid surface, which further impedes the demulsification efficiency. This work correlates the characteristics of the bitumen froth and its demulsification efficiency using two commercial demulsifiers, with useful implications for developing effective and cost-efficient demulsifiers and emulsion treatment technologies in oil production and other related chemical and engineering processes.

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“…Previous studies suggested that such a reduction in the dynamic IFT is similar to diffusion-controlled process of proteins or polymers at liquid–liquid interface. 22 –24 The Gibbs–Duhem diffusion equation (equation (5)) has been established to describe diffusion-controlled process of our demulsifiers and to analyze our dynamic IFT data, as shown in the following…”

Section: Resultsmentioning

confidence: 99%

Breaking water-in-oil emulsion of Northern Iraq’s crude oil using commercial polymers and surfactants

Al-Janabi

Ibrahim²,

Waheed

et al. 2019

Polymers and Polymer Composites

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Water (W) and oil (O) normally mix during production and while passing through valves and pumps to form a persistent water-in-oil (W/O) emulsion, which is a serious restriction in oil production and transporting and refining processes. The objective of this work is to treat emulsions of two crude oil samples labeled KD1 and DGH2 using commercial polymers and surfactants which are also known as demulsifiers. Hydrophile–lipophile balance (HLB) in the demulsifier structure has demonstrated a great effect on breaking W/O emulsion. Emulsion breakers with low HLB value showed better reduction in the dynamic IFT, high diffusivity at the W/O interface, and accelerated coalescence of water droplets. Concomitantly, high emulsion temperatures were found to reduce the interfacial film viscosity and accelerate water droplets coalescence. A maximum water separation efficiency (WSE) of 97% was achieved in the case of KD1 and 88% for DGH2, and using a (1:1) polymer blend demulsifier further increased WSE to 99% after 100 min.

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Adsorption of hybrid polyacrylamides on anisotropic kaolinite surfaces: Effect of polymer characteristics and solution properties

Cited by 26 publications

References 28 publications

Using Sulfobutylated and Sulfomethylated Lignin as Dispersant for Kaolin Suspension

Using Sulfobutylated and Sulfomethylated Lignin as Dispersant for Kaolin Suspension

Understanding the Properties of Bitumen Froth from Oil Sands Surface Mining and Treatment of Water-in-Oil Emulsions

Breaking water-in-oil emulsion of Northern Iraq’s crude oil using commercial polymers and surfactants

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