Effects of ionic surfactants on methane hydrate formation kinetics in a static system

Du, Jianwei, Li, Huijuan and Wang, Liguang (2014) Effects of ionic surfactants on methane hydrate formation kinetics in a static system. Advanced Powder Technology, 25 4: 1227-1233. doi:10.1016/j.apt.2014.06.002


Author Du, Jianwei
Li, Huijuan
Wang, Liguang
Title Effects of ionic surfactants on methane hydrate formation kinetics in a static system
Journal name Advanced Powder Technology   Check publisher's open access policy
ISSN 0921-8831
1568-5527
Publication date 2014-07
Year available 2014
Sub-type Fully published paper
DOI 10.1016/j.apt.2014.06.002
Open Access Status
Volume 25
Issue 4
Start page 1227
End page 1233
Total pages 7
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Collection year 2015
Language eng
Formatted abstract
This paper reports an experimental study of the kinetics of methane hydrate formation in the presence of ionic surfactants with equal carbon chain length, such as sodium dodecyl sulfate (SDS), dodecylamine hydrochloride (DAH), dodecyltrimethylammonium chloride (DTAC) and N-dodecylpropane-1,3-diamine hydrochloride (DN2Cl). Methane hydrates were formed at 274 K with incipient gas pressure of 15 MPa in an unstirred isochoric/isothermal reactor containing aqueous solutions at different initial surfactant loadings. It was found that addition of DTAC had little effect on methane hydrate formation whereas SDS, DAH, and DN2Cl had pronounced promoting effects. This result coincides with the fact that the Krafft point of DTAC is below 273 K and those of SDS, DAH, and DN2Cl are near room temperature. At a given initial surfactant loading, the effectiveness of the surfactants for reducing the induction time of methane hydrate formation followed the order of SDS > DAH > DN2Cl. SDS also gave higher hydrate growth rates than DAH and DN2Cl. At 1000 and 2000 ppm, however, DN2Cl gave slightly higher final methane uptake than SDS. It was also found that during the nucleation or induction period, addition of SDS, DAH and DN2Cl instead of DTAC, considerably reduced methane mole fraction in the liquid phase. Possible promotion mechanisms of surfactants during the hydrate nucleation period were discussed. 
Keyword Methane hydrate
Kinetics
Induction time
Hydrate formation rate
Methane uptake
Krafft point
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Published online ahead of print: 14 June 2014.

Document type: Journal Article
Sub-type: Fully published paper
Collections: School of Chemical Engineering Publications
Official 2015 Collection
 
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Created: Sat, 21 Jun 2014, 07:41:25 EST by Dr Liguang Wang on behalf of School of Chemical Engineering