Influence of water-insoluble organic components on the gas hydrate equilibrium conditions of methane

In this study, certain organic additives to systems of water+methane are investigated for their effect on the hydrate equilibrium pressure. The additives studied are cyclic organic components, i.e., tetrahydropyran (THP), cyclobutanone (CB), both forming structure II (sII), and methylcyclohexane (MC...

Full description

Saved in:
Bibliographic Details
Published in:Fluid phase equilibria 2000-07, Vol.172 (1), p.73-91
Main Authors: Mooijer-van den Heuvel, M.M, Peters, C.J, de Swaan Arons, J
Format: Article
Language:English
Subjects:
Applied sciences
Chemistry
Cyclic organic components
Energy
Exact sciences and technology
Experimental data
Fluoroalkanes
Fuels
Gas characteristics and properties. Sampling. Analysis
Gas hydrate equilibria
Gas industry
General and physical chemistry
Methane
Modelling
Others (including liquid-liquid-vapor equilibria)
Phase equilibria
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:In this study, certain organic additives to systems of water+methane are investigated for their effect on the hydrate equilibrium pressure. The additives studied are cyclic organic components, i.e., tetrahydropyran (THP), cyclobutanone (CB), both forming structure II (sII), and methylcyclohexane (MCH), forming structure H (sH) and fluoroalkanes, i.e., fluoroform (CHF 3) and tetrafluoromethane (CF 4), both forming sI or sII depending on the concentration. Hydrate equilibrium data for single hydrates of the fluoroalkanes were determined, of which the ones of CHF 3 were compared to previous data from literature. The hydrate equilibrium pressures were experimentally determined using the Cailletet apparatus in a range of pressures from 2 to 14 MPa and temperatures up to approximately 303 K. A reduction of the methane hydrate equilibrium pressure was observed with all additives except for CF 4. The experimental data were modelled to retrieve the Kihara fit parameters for the various additives as present in the van der Waals–Platteeuw model. By using these parameters to correlate the hydrate equilibrium pressures, deviations within approximately 3% from the experimental hydrate equilibrium line were obtained. The modelling results showed that reduction of hydrate equilibrium pressures is accompanied by a significant reduction of storage capacity for methane, which is not recommendable for practical applications.
ISSN:0378-3812
1879-0224
DOI:10.1016/S0378-3812(00)00367-8