Equilibrium data and thermodynamic modelling of cyclopentane and neopentane hydrates

Tohidi, Bahman; Danesh, Ali; Todd, Adrian Christopher; Burgass, Rhoderick William; Ostergaard, Kasper Korsholm

doi:10.1016/s0378-3812(97)00164-7

Cited by 126 publications

(125 citation statements)

References 14 publications

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“…De Deugd et al explained these findings by the differences in physical size and polarity of the three compounds and suggested cyclopentane as a possible promoter for the formation of sII hydrate. Tohidi et al (1997) had already shown this by measuring the promoting effect on the dissociation pressures of methane or nitrogen hydrates by adding cyclopentane to binary systems of water and gas. Ohmura et al (2005) measured hydrate dissociation pressures for two methyl-substituted cyclic ethers (2-methyltetrahydrofuran and 3-methyltetrahydropyran) with methane.…”

mentioning

confidence: 98%

Thermodynamic promotion of carbon dioxide–clathrate hydrate formation by tetrahydrofuran, cyclopentane and their mixtures

Herslund

Thomsen

Abildskov

et al. 2013

International Journal of Greenhouse Gas Control

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mentioning

confidence: 98%

Thermodynamic promotion of carbon dioxide–clathrate hydrate formation by tetrahydrofuran, cyclopentane and their mixtures

Herslund

Thomsen

Abildskov

et al. 2013

International Journal of Greenhouse Gas Control

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“…Considering the mine gas is a kind of mixed gas, Tohidi et al [24] and Schroeter et al [25] hold that graphic method takes a larger error and pressure search method is not suitable for multisystem and the quality analysis method has a high requirement for the equipment. Therefore, the independent developed reactor for the multicomponent mixed gas hydrate phase equilibrium testing was used to determine the equilibrium parameters incorporating with direct observation method.…”

Section: Equilibrium Conditions Of Mine Gas Hydrate Formation In Naclmentioning

confidence: 99%

Effect of Propane and NaCl-SDS Solution on Nucleation Process of Mine Gas Hydrate

Zhang

2017

Journal of Chemistry

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In order to explore the method of accelerating hydration separation process to recover methane from mine gas, propane hydrate phase equilibrium was used to measure the equilibrium points of three kinds of mine gas in NaCl solution. Driving force was set as 1 MPa on this basis and high-pressure experimental apparatus of mine gas hydrate was used to carry out the nucleation kinetics experiments of mine gas hydrate for three gas samples in different concentrations of sodium chloride (NaCl) and sodium dodecyl sulfate (SDS) compound systems, which was to study the effect of propane and NaCl-SDS solution on nucleation process of mine gas hydrate. The results showed that induction time of multicomponent mine gas hydrate formation was shortened with the decrease of methane concentration and increase of propane concentration. The induction time of mine gas hydrate formation was shortened with the reduction of NaCl concentration and the increase of SDS concentration. It was found that methane and propane in multicomponent mine gas nucleated collaboratively, which simplified its nucleation process compared with the single component. NaCl has two kinds of functions.

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“…Chemicals such as Tetrahydrofuran (THF) and cyclopentane (CP) are capable of reducing the equilibrium pressure [17][18][19] but the high volatility of these chemicals is undesirable. A group of additives, known as semi-clathrate hydrate (SCH) formers or ionic hydrate formers, are nonvolatile and can lead to lower pressure requirement than THF and CP [20,21].…”

Section: Introductionmentioning

confidence: 99%

Phase equilibrium measurements for clathrate hydrates of flue gas (CO2+N2+O2) in the presence of tetra-n-butyl ammonium bromide or tri-n-butylphosphine oxide

Wang

2015

The Journal of Chemical Thermodynamics

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Please cite this article as: J. Du, L. Wang, Phase equilibrium measurements for clathrate hydrates of flue gas (CO 2 + N 2 + O 2 ) in the presence of tetra-n-butyl ammonium bromide or tri-n-butylphosphine oxide, J. Chem. Thermodynamics (2015), doi: http://dx.doi.org/10. 1016/j.jct.2015.04.023 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. Abstract This paper reports the measured hydrate phase equilibria of simulated flue gas (12.6 vol% CO 2 , 80.5 vol% N 2 , 6.9 vol% O 2 ) in the presence of tetra-n-butyl ammonium bromide (TBAB) or tri-n-butylphosphine oxide (TBPO), at 0 wt%, 5 wt%, and 26 wt%, respectively. The measurements of the phase boundary between hydrate-liquid-vapor (H-L-V) phases and liquid-vapor (L-V) phases were performed within the temperature range (275.97 -293.99) K and pressure range (1.56 -18.78) MPa with using the isochoric step-heating pressure search method. It was found that addition of TBAB or TBPO allowed the incipient equilibrium hydrate formation conditions for the flue gas to become milder. Compared to TBAB, TBPO was largely more effective in reducing the phase equilibrium pressure.

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Equilibrium data and thermodynamic modelling of cyclopentane and neopentane hydrates

Cited by 126 publications

References 14 publications

Thermodynamic promotion of carbon dioxide–clathrate hydrate formation by tetrahydrofuran, cyclopentane and their mixtures

Thermodynamic promotion of carbon dioxide–clathrate hydrate formation by tetrahydrofuran, cyclopentane and their mixtures

Effect of Propane and NaCl-SDS Solution on Nucleation Process of Mine Gas Hydrate

Phase equilibrium measurements for clathrate hydrates of flue gas (CO2+N2+O2) in the presence of tetra-n-butyl ammonium bromide or tri-n-butylphosphine oxide

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