Effects of a naturally derived surfactant on hydrate anti-agglomeration using micromechanical force measurement

Li, Mingzhong; Dong, Sanbao; Li, Bofeng; Liu, Chenwei

doi:10.1016/j.jiec.2018.06.024

Cited by 28 publications

(20 citation statements)

References 34 publications

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“…41 They also showed that the capillary forces decreased with a higher AA dosage. 42 The high-pressure interparticle force device, known as the HP-MMF, was initially described by Brown 30 and Lee et al 43 This HP-MMF instrument was used to measure the cohesive forces of ice particles and/or CH 4 /C 2 H 6 hydrate particles in a gas phase. Wang et al 33 then performed adhesive force measurements with commercial coatings applied to carbon steel surfaces in a gas phase.…”

Section: ■ Introductionmentioning

confidence: 99%

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Structural Effects of Gas Hydrate Antiagglomerant Molecules on Interfacial Interparticle Force Interactions

Monteiro

et al. 2021

Langmuir

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Gas hydrate interparticle cohesive forces are important to determine the hydrate crystal particle agglomeration behavior and subsequent hydrate slurry transport that is critical to preventing potentially catastrophic consequences of subsea oil/gas pipeline blockages. A unique high-pressure micromechanical force apparatus has been employed to investigate the effect of the molecular structure of industrially relevant hydrate antiagglomerant (AA) inhibitors on gas hydrate crystal interparticle interactions. Four AA molecules with known detailed structures [quaternary ammonium salts with two long tails (R1) and one short tail (R2)] in which the R1 has 12 carbon (C12) and 8 carbon (C8) and saturated (C–C) versus unsaturated (CC) bonding are used in this work to investigate their interfacial activity to suppress hydrate crystal interparticle interactions in the presence of two liquid hydrocarbons (n-dodecane and n-heptane). All AAs were able to reduce the interparticle cohesive force from the baseline (23.5 ± 2.5 mN m–1), but AA-C12 shows superior performance in both liquid hydrocarbons compared to the other AAs. The interfacial measurements indicate that the AA with an R1 longer alkyl chain length can provide a denser barrier, and the AA molecules may have higher packing density when the AA R1 alkyl tail length is comparable to that of the liquid hydrocarbon chain on the gas hydrate crystal surface. Increasing the salinity can promote the effectiveness of an AA molecule and can also eliminate the effect of longer particle contact times, which typically increases the interparticle cohesive force. This work reports the first experimental investigation of high-performance known molecular structure AAs under industrially relevant conditions, showing that these molecules can reduce the interfacial tension and increase the gas hydrate–water contact angle, thereby minimizing the gas hydrate interparticle interactions. The structure–performance relation reported in this work can be used to help in the design of improved AA inhibitor molecules that will be critical to industrial hydrate crystal slurry transport.

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Section: ■ Introductionmentioning

confidence: 99%

“…Li et al used Span80 as a surfactant in the system and showed that the adsorption of Span80 on the water droplet surface made the interfaces more stable, thus preventing hydrate agglomeration . They also showed that the capillary forces decreased with a higher AA dosage …”

Section: Introductionmentioning

confidence: 99%

Structural Effects of Gas Hydrate Antiagglomerant Molecules on Interfacial Interparticle Force Interactions

Monteiro

et al. 2021

Langmuir

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“…Figure 10b shows the protocol of temperature control to promote hydrate growth. 55 The temperature in the cell was first lowered to −15 °C for 30 min to convert most of the water droplets into ice. Then the cell temperature was ramped up to 0.5 °C to melt the ice and induce hydrate formation and growth for 30 min.…”

Section: Methodsmentioning

confidence: 99%

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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“…2,3,7 Kinetic hydrate inhibitors (KHIs) and antiagglomerants (AAs) are two classes of LDHIs. 2,3,8,9 KHIs directly affect the hydrate formation kinetics by delaying the nucleation process and/or slowing the growth of hydrate crystals. 10−12 AAs may have no kinetic effect, but they manage the size of hydrate particles to inhibit their agglomeration.…”

Section: ■ Introductionmentioning

confidence: 99%

“…But they increase operating costs dramatically and require particular infrastructure such as storage tanks and recovery equipment . In recent years, the use of low-dosage hydrate inhibitors (LDHIs) has been widely studied to overcome the environmental, economic, and handling issues. ,, Kinetic hydrate inhibitors (KHIs) and antiagglomerants (AAs) are two classes of LDHIs. ,,, KHIs directly affect the hydrate formation kinetics by delaying the nucleation process and/or slowing the growth of hydrate crystals. − AAs may have no kinetic effect, but they manage the size of hydrate particles to inhibit their agglomeration. ,, The phosphonium and quaternary ammonium surfactants as commercial AAs contain two or more n -butyl, n -pentyl, or isopentyl groups. The hydrophobic tail is the most important parameter for AA performance, which alters the hydrophilic–lipophilic balance and interfacial adsorption of surfactant .…”

Section: Introductionmentioning

confidence: 99%

Dual-Function Synergists Based on Glucose and Sucrose for Gas Hydrate and Corrosion Inhibition

et al. 2020

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The increasing demand in the modern world for energy resources leads to the recovery of oil and gas fields in remote northern and Arctic regions. The development of additives that effectively prevent complications such as gas hydrate formation and corrosion is a relevant issue. In this work, a method for the modification of simple carbohydrates was proposed, which allows one to obtain reagents that are effective both in hydrate inhibition (in the form of synergistic additives to commercial hydrate inhibitors) and prevention of corrosion. Modification of glucose and sucrose was carried out by incorporation of two sulfonate and carboxyl groups into their structures. Synergists were used as bisodium salts. PVCap-based inhibitors (Luvicap EG and Luvicap 55W) were utilized as commercial kinetic hydrate inhibitors. This study has revealed that mixtures of the proposed reagents with PVCap-based polymers showed a significant synergistic effect. The temperature of hydrate onset decreased by 3.5 °C with the addition of 0.1 wt % of synergist to 0.5 wt % of PVCap-based KHI. Moreover, these reagents also effectively inhibited the corrosion of pipeline steel in 2 M HCl solution. Thus, the proposed synergists will reduce the harmful effects on the environment, risks of accidents, and operating costs due to their biocompatibility and gas hydrate and corrosion inhibition.

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Effects of a naturally derived surfactant on hydrate anti-agglomeration using micromechanical force measurement

Cited by 28 publications

References 34 publications

Structural Effects of Gas Hydrate Antiagglomerant Molecules on Interfacial Interparticle Force Interactions

Structural Effects of Gas Hydrate Antiagglomerant Molecules on Interfacial Interparticle Force Interactions

Functionalized Nanoparticles for the Dispersion of Gas Hydrates in Slurry Flow

Dual-Function Synergists Based on Glucose and Sucrose for Gas Hydrate and Corrosion Inhibition

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