Enhancing CO2 separation for pre-combustion capture with hydrate formation in silica gel pore structure

Seo, Yutaek; Kang, Seong-Pil

doi:10.1016/j.cej.2010.04.032

Cited by 97 publications

(54 citation statements)

References 17 publications

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“…Although the thermodynamic studies and structural analyses present the possibilities of developing separation technology, a weak point of these results was that several stages are required to obtain a high concentration of CO 2 stream from feed gas, which reduces the economics of the separation process (Seo and Kang, 2010). Therefore, using additives to promote hydrate formation was necessary.…”

Section: Additives Used In Co 2 Hydrate Studiesmentioning

confidence: 99%

“…They then measured the enthalpy of dissociation for carbon dioxide and nitrogen hydrates (Kang et al, 2001b). This work was extended to study CO 2 -N 2 (Seo et al, 2005) and CO 2 -H 2 (Seo and Kang, 2010) hydrate formation in porous silica gels and presented phase diagrams illustrating phase compositions. The experimental data on compositions of equilibrium phases under gas hydrate formation conditions was reported for the CO 2 -N 2 -H 2 O system (Belandria et al, 2011).…”

Section: Adisasmito Et Almentioning

confidence: 99%

“…In the literature additives are mostly divided to two main groups: hydrate inhibitors and promoters. Surface-active agents (Ando et al, 2012;Ganji et al, 2007a,b;Gayet et al, 2005;Lin et al, 2004;Lo et al, 2012a;Okutani et al, 2008;Rogers et al, 2007;Sun et al, 2007;Yoslim and Englezos, 2008;Yoslim et al, 2010;Zhang et al, 2004), salts Masoudi et al, 2005;Paricaud , 2010;Salako et al, 2012;Vu et al, 2002;Zhang et al, 2010), solid particles (Linga et al, 2009a;Park et al, 2006;Prasad et al, 2012;Seo et al, 2005;Seo and Kang, 2010) and other additives (Heidaryan et al, 2010;Kelland , 2006) have been used to slow or accelerate hydrate formation. Understanding the effect of additives on the formation of hydrates and developing a conceptual picture of hydrate formation in the presence of additives is the main focus of the current PhD study.…”

Section: Effect Of Additives On Hydrate Formationmentioning

confidence: 99%

“…For example, the thermodynamics of hydrate formation in a system that contains a mixture of methane and carbon dioxide in pure water and in aqueous electrolyte solution has been studied widely (Adisasmito et al, 1991;Brewer et al, 1999;Dholabhai et al, 1993;Halpern et al, 2001;Ohgaki et al, 1996;Saito et al, 2000;Yoon et al, 2004). The three-phase (H-L-V) equilibrium of other mixtures such as CO 2 -N 2 (Kang et al, 2001b,a;Kang and Lee, 2000;Seo et al, 2005) and CO 2 -H 2 (Seo and Kang, 2010) has also been investigated comprehensively.…”

Section: Introductionmentioning

confidence: 99%

“…Some researchers believe that effective hydrate promoters are a prerequisite for an economic separation operating system (Seo and Kang, 2010). The additives tetrahydrofuran (THF) (Kang et al, 2001b;Lee et al, 2010;Sabil et al, 2010a) , tetra-n-butyl ammonium bromide (TBAB) (Arjmandi et al, 2007;Li et al, 2009aLi et al, , 2010aLi et al, , 2009bLi et al, , 2010b, cyclopentane (CP) (Zhang and Lee, 2009) or silica (Bai et al, 2012) have been tested and used commonly as promoters for CO 2 hydrate formation.…”

Section: Introductionmentioning

confidence: 99%

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Kinetics of the formation of CO2 hydrates in the presence of sodium halides and hydrophobic fumed silica nanoparticles

Farhang¹

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CO 2 capture by trapping the greenhouse gas in clathrates hydrates is proving to be one of the promising options for long term carbon storage. This technology is desirable as it can be deposited in the deep ocean where the suitable pressure and temperature is ready without any extra cost. To date, this method has mostly been of academic interest because the formation of gas hydrates is very slow and requires lots of energy and resources. It is important therefore to develop an efficient and economical process to be able to apply this method at an industrial scale. Scientists and researchers have been looking for suitable additives to accelerate the formation of CO 2 hydrate. To meet these objectives numerous additives have previously been tested and several were found to be suitable hydrate promoters. The mechanism for the formation of gas hydrates in the presence of additives is not clear yet. Understanding this mechanism would help us to select and synthesise the most suitable and cost effective additive.In this thesis, two groups of chemicals i.e. salt and hydrophobic particles were added to the hydrate formation reactor and examined. Initially sodium halides were tested for their effect on the kinetics of the formation of CO 2 hydrates in an isochoric system. The effect of different anion types and concentrations was investigated by directly measuring pressure and temperature changes in the reactor and evaluating maximum CO 2 uptake, conversion, storage capacity, induction time, and hydrate growth rate. The results indicated that sodium halides at a concentration of 50 mM (mmol/L) increase CO 2 consumption and conversion to hydrates. In addition, sodium iodide and sodium bromide in a range of concentrations between 50 and 250 mM significantly increased the hydrate formation kinetics. Measurements of the surface potential of CO 2 hydrates formed in the presence of sodium halides showed negative charge on hydrates with the highest zeta potential observed at the concentration of 50 mM. The findings of this part of the research led us to propose a mechanism for the formation of CO 2 hydrates in the presence of sodium halides.The second group of additives extensively investigated in the current research were hydrophobic nano-particles. Two types of hydrophobic fumed silica were studied.iii They produced two types of particle stabilised systems when mixed with water (i.e. silica foam and dry water). The influence of particle hydrophobicity and concentration on hydrate formation kinetics was established by monitoring gas consumption, CO 2 conversion and induction time. The morphology, microstructure, and pore characteristics were elucidated by cryogenic scanning electron microscopy (cryo-SEM), and the elemental distribution and composition were determined by X-ray energy dispersive spectroscopy (EDS). The results indicated that the promoting effect of hydrophobic fumed silica was dependent on the particle hydrophobicity and on the weight ratio of silica to water. The kinetics of CO 2 hydrate formation were ...

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Section: Additives Used In Co 2 Hydrate Studiesmentioning

confidence: 99%

Section: Adisasmito Et Almentioning

confidence: 99%

Section: Effect Of Additives On Hydrate Formationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Kinetics of the formation of CO2 hydrates in the presence of sodium halides and hydrophobic fumed silica nanoparticles

Farhang¹

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Phase behavior and kinetics properties of gas hydrates in confinement and its application

Majid

Koh

2021

AIChE Journal

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Massive amounts of gas hydrates occur naturally in the pores of sediments or fractures in permafrost regions and beneath the oceans. For hydrate formation in confinement, the equilibrium condition can shift to harsher conditions, lowering the water activity and subsequently depressing the hydrate freezing temperature at a given pressure. Conversely, the nucleation and rate of hydrate formation, as well as hydrate conversion can be increased in confinement. Therefore, reliable assessment of the hydrate distribution in nature requires accurate thermodynamic and kinetic models of hydrate formation; however, these models tend to be based upon the properties of bulk hydrates. Hydrate formation and growth promotion in confinement are also potentially interesting for hydrate technological applications, such as gas separation, energy storage, and flow assurance. This paper reviews the thermodynamic and kinetic properties and their interrelations of gas hydrates in confined spaces.

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CO₂ solubility in aqueous binary mixtures of monoethanolamine, methyldiethanolamine, and diaminobutane

2020

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The main objective of this research is to improve the CO 2 solubility and absorption rate of conventional alkanolamines including monoethanolamine (MEA) and methyldiethanolamine (MDEA) by 1,4-diaminobutane (DAB) as a promoter. Typically, the presence of two primary functional groups, lack of strict hindrance, and low molecular weight make DAB an efficient solvent to absorb CO 2. In the first step, the absorption kinetic of DAB is investigated theoretically and a rate equation is proposed based on the zwitterion mechanism. In the second step, the equilibrium capacity of MEA and MDEA is promoted by DAB experiment in an isothermal stirred batch reactor in the pressure range 20-100 kPa, temperature range 303-313 K, and promoter volume fraction 0-10%. Then, the effective loading and regenerability of prepared samples are investigated by continuous cyclic absorption and regeneration in the designed reactor. The experimental results show that increasing DAB concentration in the MEA and MDEA as base solutions increases the CO 2 absorption rate and equilibrium capacity.

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Enhancing CO2 separation for pre-combustion capture with hydrate formation in silica gel pore structure

Cited by 97 publications

References 17 publications

Kinetics of the formation of CO2 hydrates in the presence of sodium halides and hydrophobic fumed silica nanoparticles

Kinetics of the formation of CO2 hydrates in the presence of sodium halides and hydrophobic fumed silica nanoparticles

Phase behavior and kinetics properties of gas hydrates in confinement and its application

CO₂ solubility in aqueous binary mixtures of monoethanolamine, methyldiethanolamine, and diaminobutane

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Enhancing CO2 separation for pre-combustion capture with hydrate formation in silica gel pore structure

Cited by 97 publications

References 17 publications

Kinetics of the formation of CO2 hydrates in the presence of sodium halides and hydrophobic fumed silica nanoparticles

Kinetics of the formation of CO2 hydrates in the presence of sodium halides and hydrophobic fumed silica nanoparticles

Phase behavior and kinetics properties of gas hydrates in confinement and its application

CO2 solubility in aqueous binary mixtures of monoethanolamine, methyldiethanolamine, and diaminobutane

Contact Info

Product

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CO₂ solubility in aqueous binary mixtures of monoethanolamine, methyldiethanolamine, and diaminobutane