Understanding the inhibition performance of polyvinylcaprolactam and interactions with water molecules

Liu, Jinxiang; Feng, Yongjun; Yan, Yujie; Yan, Youguo; Zhang, Jun

doi:10.1016/j.cplett.2020.138070

Cited by 6 publications

(5 citation statements)

References 48 publications

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“…Figure b shows that at the low concentration of PVCap, the polymer was relatively evenly dispersed in the solution, preventing CO 2 gas molecules from entering the liquid phase. Through hydrogen bonding, some PVCap molecules adsorbed on the surface of the hydrate cage structure, thereby reducing the number of available sites for hydrate nucleation and the probability of cross-nucleation . This phenomenon is further supported by studies which showed that PVCap adsorbed on the hydrate nucleus changed its structure and inhibited the further nucleus growth, preventing it from surpassing a certain critical size .…”

Section: Results and Discussionmentioning

confidence: 83%

“…Through hydrogen bonding, some PVCap molecules adsorbed on the surface of the hydrate cage structure, thereby reducing the number of available sites for hydrate nucleation and the probability of cross-nucleation. 27 This phenomenon is further supported by studies which showed that PVCap adsorbed on the hydrate nucleus changed its structure and inhibited the further nucleus growth, preventing it from surpassing a certain critical size. 32 At lower concentrations of PVCap, its relatively uniform distribution in the liquid phase obstructed the diffusion path of CO 2 gas and increased mass transfer resistance.…”

Section: Study Of the Effect Of Pvcap On The Microgeneration Of Co 2 ...mentioning

confidence: 77%

“…Furthermore, the dispersion of PVCap in solution also reduced the likelihood of collision between a hydrate particle and another hydrate-generating particle, thereby decreasing the possibility of cross-nucleation. Liu et al 27 carried out molecular simulations and concluded that the amide oxygen atoms on PVCap could form double hydrogen bonds with hydrogen atoms in two water molecules. Additionally, PVCap could be adsorbed onto the surface of the hydrate particles, further inhibiting the aggregation of hydrate cage structures.…”

Section: Resultsmentioning

confidence: 99%

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Study of the Microscopic Effect of PVCap on CO₂ Hydrate Generation and Adhesion

Zhou,

Zhao,

et al. 2024

Energy Fuels

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In the transportation of carbon dioxide through pipelines, the formation of hydrates presents a significant challenge, potentially obstructing the pipeline flow and compromising operational safety. One of the effective hydrate inhibition strategies to mitigate economic losses is adding poly(N-vinylcaprolactam) (PVCap). This study aims to investigate the effect of PVCap on hydrate inhibition performance using a high-pressure visualization stirring reactor to conduct experiments on CO 2 hydrate generation characteristics. Employing microscopic equipment, the study assesses PVCap's influence on various parameters including the induction time of hydrate generation, gas consumption rate, and adhesion between hydrate particles. The experimental results indicate that PVCap can effectively inhibit the generation of carbon dioxide hydrate compared to a pure water system. The inhibition effect of PVCap on hydrate increases within the concentration range of 0−1.5 wt %. However, this effect diminishes at higher concentrations (2 wt %), attributed to PVCap's adsorption onto the cage structure of hydrates. Consequently, the increased adsorption interferes with mass transfer at the gas−water interface. In addition, PVCap influences the surface roughness of hydrate particles, reducing particle adhesion within the 0−1.5 wt % concentration range but exacerbating at higher concentrations (2 wt %). This investigation sheds light on PVCap's role in hydrate inhibition, crucial for ensuring the secure flow of hydrates in pipeline operations.

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Section: Results and Discussionmentioning

confidence: 83%

Section: Study Of the Effect Of Pvcap On The Microgeneration Of Co 2 ...mentioning

confidence: 77%

Section: Resultsmentioning

confidence: 99%

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Study of the Microscopic Effect of PVCap on CO₂ Hydrate Generation and Adhesion

Zhou,

Zhao,

et al. 2024

Energy Fuels

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“…Hydrate formation in the presence of an inhibitor occurs unevenly, especially at a concentration of 0.05%, where jumps and drops in the amplitude of the dielectric constant are observed. This is probably due to the involvement of inhibitor molecules in hydrogen bonding and the destruction of nucleation centers, which causes disruption to the local ordering of water molecules and prevents the formation of hydrate [ 39 , 40 , 41 , 42 , 43 ].…”

Section: Resultsmentioning

confidence: 99%

Advances in the Study of Gas Hydrates by Dielectric Spectroscopy

et al. 2021

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The influence of kinetic hydrate inhibitors on the process of natural gas hydrate nucleation was studied using the method of dielectric spectroscopy. The processes of gas hydrate formation and decomposition were monitored using the temperature dependence of the real component of the dielectric constant ε′(T). Analysis of the relaxation times τ and activation energy ΔE of the dielectric relaxation process revealed the inhibitor was involved in hydrogen bonding and the disruption of the local structures of water molecules.

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“…Here we propose an idea to explain the coexistence of free gas and gas hydrate in GHSZ from the kinetic perspective. The presence of materials in pore water and sediments with the ability to retard gas hydrate formation and suppress the gas hydrate growth can decline the gas hydrate formation rate (such as polysaccharides [61,62] and polyvinylcaprolactam [63] as natural and artificial kinetic hydrate inhibitors, respectively). To investigate the effect of gas hydrate formation kinetic in pores, after about 37 million years, we assumed the kinetic constant of gas hydrate decreases to 0.1, 0.01, and 0.001 of the initial value.…”

Section: Coexistence Of Free Gas and Gas Hydrate In Ghszmentioning

confidence: 99%

A New Dynamic Modeling Approach to Predict Microbial Methane Generation and Consumption in Marine Sediments

2021

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Methane, as a clean energy source and a potent greenhouse gas, is produced in marine sediments by microbes via complex biogeochemical processes associated with the mineralization of organic matter. Quantitative modeling of biogeochemical processes is a crucial way to advance the understanding of the global carbon cycle and the past, present, and future of climate change. Here, we present a new approach of dynamic transport-reaction model combined with sediment deposition. Compared to other studies, since the model does not need the methane concentration in the bottom of sediments and predicts that value, it provides us with a robust carbon budget estimation tool in the sediment. We applied the model to the Blake Ridge region (Ocean Drilling Program, Leg 164, site 997). Based on seafloor data as input, our model remarkably reproduces measured values of total organic carbon, dissolved inorganic carbon, sulfate, calcium, and magnesium concentration in pore waters and the in situ methane presented in three phases: dissolved in pore water, trapped in gas hydrate, and as free gas. Kinetically, we examined the coexistence of free gas and hydrate, and demonstrated how it might affect methane gas migration in marine sediment within the gas hydrate stability zone.

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Understanding the inhibition performance of polyvinylcaprolactam and interactions with water molecules

Cited by 6 publications

References 48 publications

Study of the Microscopic Effect of PVCap on CO₂ Hydrate Generation and Adhesion

Study of the Microscopic Effect of PVCap on CO₂ Hydrate Generation and Adhesion

Advances in the Study of Gas Hydrates by Dielectric Spectroscopy

A New Dynamic Modeling Approach to Predict Microbial Methane Generation and Consumption in Marine Sediments

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Understanding the inhibition performance of polyvinylcaprolactam and interactions with water molecules

Cited by 6 publications

References 48 publications

Study of the Microscopic Effect of PVCap on CO2 Hydrate Generation and Adhesion

Study of the Microscopic Effect of PVCap on CO2 Hydrate Generation and Adhesion

Advances in the Study of Gas Hydrates by Dielectric Spectroscopy

A New Dynamic Modeling Approach to Predict Microbial Methane Generation and Consumption in Marine Sediments

Contact Info

Product

Resources

About

Study of the Microscopic Effect of PVCap on CO₂ Hydrate Generation and Adhesion

Study of the Microscopic Effect of PVCap on CO₂ Hydrate Generation and Adhesion