THERMODYNAMIC STABILITY AND SELF-PRESERVATION PROPERTIES OF SEMI-CLATHRATES IN THE METHANE+TETRA-n-BUTYL AMMONIUM BROMIDE+WATER SYSTEM

Jebraeel Gholinezhad, Antonin Chapoy, Bahman Tohidi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Unlike normal gas hydrates, research on semi-clathrate hydrates is still at its early stages. Experimental data are needed both to characterize these hydrates and to further develop appropriate predictive models. In this work, the thermodynamic phase boundary of sem i-clathrate hydrates of methane–tetra-n-butyl ammonium bromide– water at TBAB concentration of 40.7 wt% (3.70 mol%) was determined and compared to the data for other concentrations. The measurements were carried out in a laboratory–scale stirred tank reactor using an isochoric step-heating method at temperature range of 291.05 to 297.25 K and pressure range of 3.65 to 16.73 MPa. The comparison of these results with the literature data at other TBAB concentrations showed that the chosen concentration of 40.7 wt% yields the most stable semiclathrates with the highest shift in the phase boundary. In addition, dissociation rate of semi-clathrates at atmospheric conditions was measured at 274.65 and 270.15 K showing considerable stability for this system. The test results showed that 5 vol% of the total methane stored is released at 270.15 after 240 hours. This means a very low dissociation rate of only 0.5 vol% per day on average. The results of this study can be useful in up-scaling the process of gas storage and transportation by hydrates.
Original languageEnglish
Title of host publicationProceedings of the 7th International Conference on Gas Hydrates (ICGH 2011)
Place of PublicationEdinburgh
Number of pages7
Publication statusPublished - 21 Jul 2011
Externally publishedYes
EventInternational Conference on Gas Hydrates - Edinburgh International Conference Centre, Edinburgh, United Kingdom
Duration: 17 Jul 201121 Jul 2011
Conference number: 7
http://www.pet.hw.ac.uk/icgh7/

Conference

ConferenceInternational Conference on Gas Hydrates
Abbreviated titleICGH
CountryUnited Kingdom
CityEdinburgh
Period17/07/1121/07/11
Internet address

Keywords

  • Gas hydrates
  • semi-clathrates
  • TBAB
  • gas storage
  • methane
  • hydrate phase boundary

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