Anti-Adhesive Behaviors between Solid Hydrate and Liquid Aqueous Phase Induced by Hydrophobic Silica Nanoparticles

Min, Jae; Baek, Seungjun; Somasundaran, P.; Lee, Jae Woo

doi:10.1021/acs.langmuir.6b02729

Cited by 23 publications

(35 citation statements)

References 36 publications

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“…They may not only stay at the water–oil interface but can also remain at the solid–liquid interface after hydrate formation. The reduced adhesion force between water droplets and hydrates or between hydrates themselves was also reported by Min et al 19…”

Section: Discussionsupporting

confidence: 74%

“…In fact, some previous studies are supportive to this hypothesis. Min et al, 19 Cha et al., 20 and Baek et al 21 reported that the silica-NP-laden oil/water interface was less penetrable by hydrate particles and the activated carbon NPs could kinetically prevent hydrate formation by preventing the seeding hydrate penetration into the water phase. The results suggested that the NPs may prevent the coalescence between liquid water droplets and hydrate particles.…”

Section: Introductionmentioning

confidence: 99%

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Functionalized Nanoparticles for the Dispersion of Gas Hydrates in Slurry Flow

et al. 2019

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Gas hydrates are crystals that can form in oil and gas production. Their agglomeration in flowlines may disrupt the normal production. One current strategy of hydrate management is to inject an anti-agglomerant, a type of low-dosage hydrate inhibitor that prevents hydrate agglomeration. Concerns in the use of these chemicals include their toxicity, cost, and environmental impacts. In this study, we exploited functionalized nanoparticles in place of anti-agglomerants to produce hydrate slurry, with the potential benefit of nanoparticles to be more environmentally friendly and conveniently recyclable. We coated 256 nm spherical silica nanoparticles with different hydrophobicity and evaluated their performance for the hydrate dispersion at atmospheric and high pressure. Nanoparticles with moderate hydrophobicity stabilized oil-in-water (O/W) or water-in-oil (W/O) emulsions. Direct visualization of the cyclopentane hydrate formation from the nanoparticle-stabilized emulsions revealed different morphologies of hydrate particles depending on whether the nanoparticles prevented agglomeration. We also measured the apparent viscosity of a hydrate–nanoparticle mixture using a high-pressure rheometer. Nanoparticles with moderate hydrophobicity during hydrate formation slowed the viscosification, reduced the maximum viscosity, increased the water conversion, and ultimately helped to maintain a low steady-state viscosity. Increasing nanoparticle or salt concentrations also improved the gas hydrate dispersion. Our study demonstrated the great potential of using nanoparticles in preventing agglomeration of gas hydrates under realistic pipeline flow conditions.

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Section: Discussionsupporting

confidence: 74%

Section: Introductionmentioning

confidence: 99%

Functionalized Nanoparticles for the Dispersion of Gas Hydrates in Slurry Flow

et al. 2019

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“…Moreover, the anti-agglomeration performance could be evaluated by the anti-adhesion behavior. Anti-adhesion force is determined as the maximum repulsive force to prevent the formation of the capillary bridge between the aqueous solution drop and the hydrate particle. , Min et al and Lee et al demonstrated that both hydrophobic silica nanoparticles and myristic acid were effective anti-adhesion surface active materials.…”

Section: Introductionmentioning

confidence: 99%

Interaction Between the Cyclopentane Hydrate Particle and Water Droplet in Hydrocarbon Oil

et al. 2020

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The presence of immiscible water drops in bulk hydrocarbon is likely to bridge hydrate particles to cause hydrate agglomeration, leading to potential pipeline blockage. This can become a major challenge for flow assurance in offshore petroleum transportation. To avoid hydrate aggregation, the attachment between hydrate and water drops should be avoided. In this study, we used our home-designed integrated thin film drainage apparatus to investigate the interactions between a hydrate particle and a water drop inside model oil (i.e., mixture of cyclopentane and toluene with a volumetric ratio of 1:1). Our experiments showed that asphaltenes, a natural component in crude oil, were an effective inhibitor for the attachment between water drops and hydrate particles. Without asphaltenes in the system, the water drop adhered to the hydrate particle immediately after the two surfaces contacted. By adding 0.03 g/L asphaltenes into the oil phase, the attachment was delayed by 0.7 s when the applied preload force was set to around 0.05 mN. By increasing the asphaltenes addition to 0.05 g/L, the attachment between the hydrate and water drop was prevented even when the contact time lasted up to 25 s. This phenomenon could be explained by the adsorption of an asphaltenes layer along the interface between the aqueous drop and hydrocarbon. Measurements of the dynamic interfacial tension and crumping ratio confirmed the presence of the adsorption layer. The addition of 0.6 mol/L NaCl or 0.3 mol/L CaCl2 in the aqueous drop could further enhance the strength of the adsorption layer. Results of this research provide understanding of the benefits of asphaltenes and salt in preventing hydrate agglomeration.

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“…Various hydrophobic silicas are of importance from a practical point of view − and produced by many companies for a variety of applications. − Many problems appearing upon the use of hydrophobic materials are caused by features of their interactions with water, the degree of hydrophobicity, durability of a hydrophobic functional layer, etc. − Interaction of water with a solid surface depends not only on the type of functionalization (hydrophobization), but also on the surface topology and confined space effects, as well on the presence of coadsorbates and a dispersion medium type. ,− On the other hand, water can strongly affect the organization of fumed metal or metalloid oxides (FMO) with respect to the secondary particles such as aggregates of nonporous nanoparticles (NPNP) and agglomerates of aggregates. ,, Additionally, in the systems with hydrophobic particles and water, air bubbles can play an important role in flotation and decrease in the wettability of a particle surface and whole secondary structures with hydrophobized NPNP. , Features of interactions of water with hydrophobic and hydrophilic particles allow one to create “dry” water or the reverse system with hydrophobic cores and hydrophilic shells containing bound water. − Note that water bound to hydrophilic components of complex materials (such as polymers, rubbers, and paints filled by pigment particles, etc.) can lead to some negative effects.…”

Section: Introductionmentioning

confidence: 99%

Water Interactions with Hydrophobic versus Hydrophilic Nanosilica

et al. 2018

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It is well-known that interaction of hydrophobic powders with water is weak, and upon mixing, they typically form separated phases. Preparation of hydrophobic nanosilica AM1 with a relatively large content of bound water with no formation of separated phases was the aim of this study. Unmodified nanosilica A-300 and initial AM1 (A-300 completely hydrophobized by dimethyldichlorosilane), compacted A-300 (cA-300), and compacted AM1 (cAM1) containing 50-58 wt % of bound water were studied using low-temperature H NMR spectroscopy, thermogravimetry, infrared spectroscopy, microscopy, small-angle X-ray scattering, nitrogen adsorption, and theoretical modeling. After mechanical activation (∼20 atm) upon stirring of AM1/water mixture at the degree of hydration h = 1.0 or 1.4 g of distilled water per gram of dry silica, all water is bound and the blend has the bulk density of 0.7 g/cm. The temperature and interfacial behaviors of bound water depend strongly on a dispersion media type (air, chloroform, and chloroform with trifluoroacetic acid (4:1)) because the boundary area between immiscible water and chloroform should be minimal. Water and chloroform molecules are of different sizes affecting their distribution in pores (voids between silica nanoparticles in their aggregates) of different sizes. Structural, morphological, and textural characteristics of silicas, and environmental features affect not only the distribution of bound water, but also the amounts of strongly (frozen at T < 260 K) and weakly (frozen at 260 K < T < 273 K) bound and strongly (chemical shift δ = 4-6 ppm) and weakly (δ = 1-2 ppm) associated waters. Despite the changes in the characteristics of cAM1, it demonstrates a flotation effect. The developed system with cAM1/bound water could be of interest from a practical point of view due to controlled interactions with aqueous surroundings.

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Anti-Adhesive Behaviors between Solid Hydrate and Liquid Aqueous Phase Induced by Hydrophobic Silica Nanoparticles

Cited by 23 publications

References 36 publications

Functionalized Nanoparticles for the Dispersion of Gas Hydrates in Slurry Flow

Functionalized Nanoparticles for the Dispersion of Gas Hydrates in Slurry Flow

Interaction Between the Cyclopentane Hydrate Particle and Water Droplet in Hydrocarbon Oil

Water Interactions with Hydrophobic versus Hydrophilic Nanosilica

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