Effect of carbon chain length of organic salts on the thermodynamic stability of methane hydrate
This study presents the phase equilibrium conditions for methane hydrate with one of the following organic ammonium salts differing in carbon chain length: tetramethylammonium bromide (TMAB), tetraethylammonium bromide (TEAB), tetrapropylammonium bromide (TPrAB), tetrabutylammonium bromide (TBAB), a...
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American Chemical Society
2016
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ftunivqespace:oai:espace.library.uq.edu.au:UQ:385380 2023-05-15T17:11:48+02:00 Effect of carbon chain length of organic salts on the thermodynamic stability of methane hydrate Su, Yuan Bernardi, Stefano Searles, Debra J. Wang, Liguang 2016-04-20 https://espace.library.uq.edu.au/view/UQ:385380 eng eng American Chemical Society doi:10.1021/acs.jced.6b00185 issn:0021-9568 issn:1520-5134 orcid:0000-0003-1346-8318 orcid:0000-0002-6153-2209 1092846 Not set Thermodynamics Chemistry Multidisciplinary Engineering Chemical 1500 Chemical Engineering 1600 Chemistry Journal Article 2016 ftunivqespace https://doi.org/10.1021/acs.jced.6b00185 2020-11-17T02:05:26Z This study presents the phase equilibrium conditions for methane hydrate with one of the following organic ammonium salts differing in carbon chain length: tetramethylammonium bromide (TMAB), tetraethylammonium bromide (TEAB), tetrapropylammonium bromide (TPrAB), tetrabutylammonium bromide (TBAB), and tetrapentylammonium bromide (TPeAB). The hydrate phase equilibrium measurements were conducted for a temperature range of 278.94-291.85 K and pressure range of 4.79-14.32 MPa using the step-heating pressure search method. The addition of TBAB or TPeAB shifts the phase equilibria of the semiclathrate hydrates (SCHs) of CH to a lower pressure and higher temperature zone. At a given temperature, increasing the mole fraction of TBAB and TPeAB from 0.294 mol % to 0.620 mol % made the shift in phase equilibrium conditions greater. At a given dosage, TBAB consistently outperformed TPeAB in thermodynamically promoting methane hydrate formation. TMAB, TEAB, or TPrAB slightly shifts the phase equilibrium conditions to a higher pressure and lower temperature region. We analyzed the hydrate phase equilibrium data for TMAB, TEAB, and TPrAB using the colligative property equation and compared them with the phase equilibrium data of a CH and salt water system. The results suggest that these three organic salts have a small hydrate inhibiting effect that is comparable to NaCl. Promotion of the formation of CH hydrate by TBAB and TPeAB indicates that these additives provide a means to store CH at moderate pressure conditions, which could lower the cost of pressure reduction in hydrate formation. In contrast, TMAB, TEAB, and TPrAB could be used for prevention of formation of hydrates in systems where the use of NaCl is unsuitable. Article in Journal/Newspaper Methane hydrate The University of Queensland: UQ eSpace Journal of Chemical & Engineering Data 61 5 1952 1960 |
institution |
Open Polar |
collection |
The University of Queensland: UQ eSpace |
op_collection_id |
ftunivqespace |
language |
English |
topic |
Thermodynamics Chemistry Multidisciplinary Engineering Chemical 1500 Chemical Engineering 1600 Chemistry |
spellingShingle |
Thermodynamics Chemistry Multidisciplinary Engineering Chemical 1500 Chemical Engineering 1600 Chemistry Su, Yuan Bernardi, Stefano Searles, Debra J. Wang, Liguang Effect of carbon chain length of organic salts on the thermodynamic stability of methane hydrate |
topic_facet |
Thermodynamics Chemistry Multidisciplinary Engineering Chemical 1500 Chemical Engineering 1600 Chemistry |
description |
This study presents the phase equilibrium conditions for methane hydrate with one of the following organic ammonium salts differing in carbon chain length: tetramethylammonium bromide (TMAB), tetraethylammonium bromide (TEAB), tetrapropylammonium bromide (TPrAB), tetrabutylammonium bromide (TBAB), and tetrapentylammonium bromide (TPeAB). The hydrate phase equilibrium measurements were conducted for a temperature range of 278.94-291.85 K and pressure range of 4.79-14.32 MPa using the step-heating pressure search method. The addition of TBAB or TPeAB shifts the phase equilibria of the semiclathrate hydrates (SCHs) of CH to a lower pressure and higher temperature zone. At a given temperature, increasing the mole fraction of TBAB and TPeAB from 0.294 mol % to 0.620 mol % made the shift in phase equilibrium conditions greater. At a given dosage, TBAB consistently outperformed TPeAB in thermodynamically promoting methane hydrate formation. TMAB, TEAB, or TPrAB slightly shifts the phase equilibrium conditions to a higher pressure and lower temperature region. We analyzed the hydrate phase equilibrium data for TMAB, TEAB, and TPrAB using the colligative property equation and compared them with the phase equilibrium data of a CH and salt water system. The results suggest that these three organic salts have a small hydrate inhibiting effect that is comparable to NaCl. Promotion of the formation of CH hydrate by TBAB and TPeAB indicates that these additives provide a means to store CH at moderate pressure conditions, which could lower the cost of pressure reduction in hydrate formation. In contrast, TMAB, TEAB, and TPrAB could be used for prevention of formation of hydrates in systems where the use of NaCl is unsuitable. |
format |
Article in Journal/Newspaper |
author |
Su, Yuan Bernardi, Stefano Searles, Debra J. Wang, Liguang |
author_facet |
Su, Yuan Bernardi, Stefano Searles, Debra J. Wang, Liguang |
author_sort |
Su, Yuan |
title |
Effect of carbon chain length of organic salts on the thermodynamic stability of methane hydrate |
title_short |
Effect of carbon chain length of organic salts on the thermodynamic stability of methane hydrate |
title_full |
Effect of carbon chain length of organic salts on the thermodynamic stability of methane hydrate |
title_fullStr |
Effect of carbon chain length of organic salts on the thermodynamic stability of methane hydrate |
title_full_unstemmed |
Effect of carbon chain length of organic salts on the thermodynamic stability of methane hydrate |
title_sort |
effect of carbon chain length of organic salts on the thermodynamic stability of methane hydrate |
publisher |
American Chemical Society |
publishDate |
2016 |
url |
https://espace.library.uq.edu.au/view/UQ:385380 |
genre |
Methane hydrate |
genre_facet |
Methane hydrate |
op_relation |
doi:10.1021/acs.jced.6b00185 issn:0021-9568 issn:1520-5134 orcid:0000-0003-1346-8318 orcid:0000-0002-6153-2209 1092846 Not set |
op_doi |
https://doi.org/10.1021/acs.jced.6b00185 |
container_title |
Journal of Chemical & Engineering Data |
container_volume |
61 |
container_issue |
5 |
container_start_page |
1952 |
op_container_end_page |
1960 |
_version_ |
1766068561460068352 |