Amino Acids as Kinetic Promoters for Gas Hydrate Applications: A Mini Review

Bhattacharjee, Gaurav; Linga, Praveen

doi:10.1021/acs.energyfuels.1c00502

Cited by 124 publications

(123 citation statements)

References 126 publications

(370 reference statements)

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“…According to the previous studies, enhancing the hydrophobicity of amino acids, having longer alkyl side chains, generally decreases their KHI effects, 23,24 and a few hydrophobic amino acids can even function as kinetic promoters. 25,26 The KHI mechanism of amino acids is primarily understood by the perturbation of the hydrogen-bond network between water molecules. 19,23,24 Amino acids with hydrophobic side chains are known to strengthen the hydrogen bonds, inducing water molecules to arrange in clathrate-like structures, while those with hydrophilic side chains disrupt the water hydrogen-bond network, rendering it incompatible with the clathrate structure.…”

Section: ■ Introductionmentioning

confidence: 99%

Natural Hydrophilic Amino Acids as Environment-Friendly Gas Hydrate Inhibitors for Carbon Capture and Sequestration

Kim

Cho

2021

ACS Sustainable Chem. Eng.

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Carbon capture and sequestration using gas hydrates are receiving a great deal of attention as clean processes since hydrates produce water as a major byproduct. The formation of hydrates in pipelines for CO2 transport and oil/gas production systems is also of great importance due to safety and cost issues. The use of chemical additives is necessary to optimize operating temperature and pressure conditions for the proper control and management of hydrate formation. Accordingly, their potential environmental impacts have led to the surging demand for eco-friendly hydrate additives. Amino acids have been recognized as a promising class of hydrate inhibitors as they interact with water via hydrogen-bonding and electrostatic interactions. However, insufficient inhibitory effects of amino acids and low solubility in liquid water have been considered to limit their applications. In this work, we report the effective use of hydrophilic amino acids as promising inhibitors for CO2 hydrates. Superior inhibitory efficiency of l-serine is achieved by its hydroxy group, which lowers the water activity through hydrogen bonding, thus shifting hydrate formation conditions to lower-temperature and higher-pressure regions. When added at 0.1 mol %, l-serine retards hydrate formation kinetics primarily by disrupting the water hydrogen-bond network. The thermodynamic inhibitory effect of l-proline even exceeds that of methanol due to its abnormally high hydrophilicity originating from the unique structural characteristics, and it works at high concentrations as a dual-function inhibitor affecting both phase equilibria and formation kinetics. The use of amino acids is highly preferred as they are natural and biodegradable substances, and therefore the potential environmental risk can be minimized. The corrosion issue often caused by the use of salts can also be neglected. The high solubility of hydrophilic amino acids allows them to be applied for a wide range of temperature and pressure conditions required for carbon capture and sequestration processes using gas hydrates.

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Section: ■ Introductionmentioning

confidence: 99%

Natural Hydrophilic Amino Acids as Environment-Friendly Gas Hydrate Inhibitors for Carbon Capture and Sequestration

Kim

Cho

2021

ACS Sustainable Chem. Eng.

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“…Several studies and reviews have been reported in the literature. Most of these reviews focus on a specific type of KHP and hydrate former. − In this review, the effect of three common types of KHPs (surfactants, amino acids, and nanoparticles) on methane and carbon dioxide hydrates are discussed. This knowledge is helpful in the applications for energy storage and transportation as well as carbon capture.…”

Section: Kinetic Hydrate Promotersmentioning

confidence: 99%

“…Bhattacharjee at al. reported that this foam lasted even 4 h after hydrate dissociation . Several researchers have reported that these challenges can be resolved using amino acids instead of surfactants.…”

Section: Kinetic Hydrate Promotersmentioning

confidence: 99%

“…Figure shows the basic structure of amino acids. Because amino acids are the building blocks of protein molecules, amino acids are considered biodegradable . Thus, it is hypothesized that the use of amino acids as kinetic hydrate promoters is more environmentally friendly …”

Section: Kinetic Hydrate Promotersmentioning

confidence: 99%

“…Because amino acids are the building blocks of protein molecules, amino acids are considered biodegradable . Thus, it is hypothesized that the use of amino acids as kinetic hydrate promoters is more environmentally friendly Table summarizes the different amino acids used in various investigations, and Figure shows examples of amino acids that were used as KHPs.…”

Section: Kinetic Hydrate Promotersmentioning

confidence: 99%

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Thermodynamic and Kinetic Promoters for Gas Hydrate Technological Applications

2021

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In recent years, there has been growing interest in gas hydrates as technological applications, such as for energy (methane and hydrogen) storage and transportation, separation (gas and desalination), and carbon capture. However, there are several challenges that deter large-scale applications and commercialization of these hydrate-based technologies. One of the main challenges is the long induction time and slow growth of hydrate particles, which can increase the overall operating costs of these technologies. It has been reported that the addition of additives (known as hydrate promoters) can help improve the nucleation and growth rate of hydrates. In general, there are two types of hydrate promoters: thermodynamic hydrate promoters and kinetic hydrate promoters. Thermodynamic hydrate promoters shift the hydrate equilibrium curve to milder conditions (i.e., lower pressures and higher temperatures), while kinetic hydrate promoters reduce the induction time for hydrate formation and increase the growth rate. In this review, we provide a comprehensive review of the two types of hydrate promoters (thermodynamic and kinetic) and their effects on hydrate phase equilibria, induction time, and growth rate.

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Effects of salt content on secondary formation of hydrates in complex systems

Jiang,

Wang,

et al. 2023

Can J Chem Eng

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The phenomenon of ‘memory effect’ exists in the secondary generation of natural gas hydrates, which is mainly manifested in the fact that the induction time required for the nucleation of hydrates in the secondary generation of hydrates is significantly shorter than that of the primary generation, thus accelerating the generation of hydrates. At present, the research on the memory effect phenomenon has been proven to exist, and its influencing factors have become a research hotspot. In order to study the influence of decomposition time and salt content on the memory effect, the hydrate was generated under the system of porous medium alumina complexed with surfactant SDS, and hydrate secondary generation experiments were carried out by adding different contents of NaCl according to four different decomposition times. The influence of four different decomposition times on the memory effect phenomenon in the secondary generation of hydrates and the influence of different salt contents on the memory effect phenomenon were analyzed by observing the pressure drop changes in the reactor during the hydrate generation process and calculating the methane gas consumption. The experimental results show that different decomposition times can affect the effect and time of the memory effect, and the effect of decomposition time on the memory effect does not show a linear relationship. The addition of salt may have an inhibitory effect on the memory effect.

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Amino Acids as Kinetic Promoters for Gas Hydrate Applications: A Mini Review

Cited by 124 publications

References 126 publications

Natural Hydrophilic Amino Acids as Environment-Friendly Gas Hydrate Inhibitors for Carbon Capture and Sequestration

Natural Hydrophilic Amino Acids as Environment-Friendly Gas Hydrate Inhibitors for Carbon Capture and Sequestration

Thermodynamic and Kinetic Promoters for Gas Hydrate Technological Applications

Effects of salt content on secondary formation of hydrates in complex systems

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