Numerical Simulation of Separating Gas Mixtures via Hydrate Formation in Bubble Column

Luo, Yantuo; Zhu, Jianhua; Chen, Guangjin

doi:10.1016/s1004-9541(07)60091-3

Cited by 13 publications

(4 citation statements)

References 12 publications

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“…As a promising alternative, hydrate formation has been reported as an effective method for CO 2 capture, it involves a low energy consumption of 0.57 kWh/kg-CO 2 . Simultaneously, based on the CO 2 hydrate generation process, this method can be applied in gas separation, seawater desalination, fruit juice concentration, natural gas replacement, and cold storage. − …”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Mechanism of Enhanced CO₂ Hydrate Generation by Thermodynamic Promoters

Liu

Huang

Meng

et al. 2023

ACS Sustainable Chem. Eng.

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CO 2 capture by hydrates is attracting worldwide research interest. In particular, the mechanisms of various additives are being actively studied. In this study, static hydrate formation experiments were performed at pressures of 2.5 and 3.5 MPa and at 0.5 °C using three thermodynamic promoters. The results revealed that 39 wt % TBAB and the CP system could enhance hydrate formation and CO 2 capture at the two experimental pressures. The same effect was observed for the THF system at 3.5 MPa, and all systems except the CP system at 3.5 MPa accelerated the hydrate formation. By building a Raman observation system and the use of differential scanning calorimetry, we found that the hydrate formation process in the thermodynamic promoter system can be divided into three stages: promoter hydrate formation, crystal size adjustment, and induction of CO 2 hydrate formation. It was observed that the formation and crystal stability of the thermodynamic promoter hydrate were key to the acceleration of CO 2 hydrate formation. This finding indicated that the promoter of the CO 2 hydrate has an "optimal induction size." This study provides a theoretical foundation for the further development of CO 2 capture and storage technology involving the use of the hydrate method.

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Section: Introductionmentioning

confidence: 99%

Experimental Study on the Mechanism of Enhanced CO₂ Hydrate Generation by Thermodynamic Promoters

Liu

Huang

Meng

et al. 2023

ACS Sustainable Chem. Eng.

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“…Gas hydrates, the ice-like non-stochiometric crystalline solids, have some valuable characteristics, including mild pressure−temperature conditions for the formation of hydrate, high storage capacity, and safe storage. It was suggested to use these properties of gas hydrates in separating and concentrating noble gases and components of mixed gas (i.e., N 2 −CO 2 , H 2 −CO 2 , , and H 2 −CH 4 ). The main components (CH 4 , N 2 , O 2 , etc.)…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic Promotion of Tetrahydrofuran on Methane Separation from Low-Concentration Coal Mine Methane Based on Hydrate

Zhang

2010

Energy Fuels

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This paper proposed a new hydrate-based gas separation (HBGS) method especially for recovering methane from low-concentration coal mine methane (CMM). The main purpose of this study was to evaluate the thermodynamic promotion of tetrahydrofuran (THF) on methane recovery from lowconcentration CMM. Temperature and pressure conditions for incipient hydrate formation (vapor-aqueous liquid-hydrate) were closely examined at various different THF concentrations (1.00, 0.10, and 0.01 mol L -1 ) in gas hydrate systems (CH 4 -N 2 -O 2 -THF-H 2 O) and at various initial operating pressures (8, 10, and 14 MPa). Subsequently, the phase equilibrium parameters of hydrate formation for the CH 4 -N 2 -O 2 -H 2 O system were calculated using the Chen-Guo model and the Patel-Teja equation of state. The difference between experimental and calculated values indicates that the addition of THF significantly reduced the equilibrium formation conditions. The higher the THF concentration and the initial operation pressure, the more significant the promotion effect of THF. THF with a concentration of 1 mol L -1 was found to promote CH 4 capture the best under an initial operation pressure of 14 MPa in the range of those examined. The present study illustrates the concept and provides thermodynamic data that will aid in the design and production of an effective hydrate-based methane recovery process.

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“…Most studies on hydrate formation kinetics reported in the literatures were carried out in the batch stirred tanks, which will limit industrial applications, especially for separating gas mixtures. Luo et al − conducted a kinetic study on hydrate formation of the CH 4 + THF system in a bubble tower. When developing the kinetic model, the C-G two-step formation mechanism was utilized as a basis, and the assumption of the hydrate formation procedure was expressed as only THF plus water molecules form basic hydrates, which means THF molecules will occupy all large cavities.…”

Section: Applications Of the Chen–guo Model In Kinetics Of Hydrate Fo...mentioning

confidence: 99%

Review on the Applications and Modifications of the Chen–Guo Model for Hydrate Formation and Dissociation

et al. 2021

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Research on gas hydrates is relevant to many industrial issues including flow assurance in oil and gas production and transportation, exploitation of new energy deposits in the form of natural gas hydrates, gas storage, separation, and more. The thermodynamic modeling of a gas hydrate formation is a fundamental work for all gas hydrate research. Considering the drawbacks of the traditional van der Waals−Platteeuw type models, Chen and Guo proposed a new approach to the modeling of hydrate formation/dissociation based on a reaction plus adsorption two-step hydrate formation mechanism instead of the single adsorption mechanism in van der Waals−Platteeuw theory. Since the establishment of the Chen−Guo model in the 1990s, it has achieved wide applications in modeling of hydrate formation thermodynamics, kinetics, and hydrate-based technical processes. For removing the limitations of the original Chen−Guo model, a series of extensions or modifications have been done successfully by many researchers to make it suitable for different complicated systems, including structure-H and semiclathrate hydrates, sour gas/inhibitor/promoter-containing systems, water-in-oil emulsion systems, and porous systems. The aim of this review is to summarize these applications, extensions, and modifications to the Chen− Guo model as well as the two-step mechanism in recent years. Almost 190 references have been cited in this review. We hope it will be helpful for the gas hydrate community.

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Numerical Simulation of Separating Gas Mixtures via Hydrate Formation in Bubble Column

Cited by 13 publications

References 12 publications

Experimental Study on the Mechanism of Enhanced CO₂ Hydrate Generation by Thermodynamic Promoters

Experimental Study on the Mechanism of Enhanced CO₂ Hydrate Generation by Thermodynamic Promoters

Thermodynamic Promotion of Tetrahydrofuran on Methane Separation from Low-Concentration Coal Mine Methane Based on Hydrate

Review on the Applications and Modifications of the Chen–Guo Model for Hydrate Formation and Dissociation

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Numerical Simulation of Separating Gas Mixtures via Hydrate Formation in Bubble Column

Cited by 13 publications

References 12 publications

Experimental Study on the Mechanism of Enhanced CO2 Hydrate Generation by Thermodynamic Promoters

Experimental Study on the Mechanism of Enhanced CO2 Hydrate Generation by Thermodynamic Promoters

Thermodynamic Promotion of Tetrahydrofuran on Methane Separation from Low-Concentration Coal Mine Methane Based on Hydrate

Review on the Applications and Modifications of the Chen–Guo Model for Hydrate Formation and Dissociation

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Experimental Study on the Mechanism of Enhanced CO₂ Hydrate Generation by Thermodynamic Promoters

Experimental Study on the Mechanism of Enhanced CO₂ Hydrate Generation by Thermodynamic Promoters