OATAO - Open Archive Toulouse Archive Ouverte Open Access Week

Effect of the concentration and carbon chain length of a sulfate-based surfactant on hydrate formation kinetics

Ricaurte, Marvin and Torré, Jean-Philippe and Diaz, Joseph and Dicharry, Christophe Effect of the concentration and carbon chain length of a sulfate-based surfactant on hydrate formation kinetics. (2014) In: 8th International Conference on Gas Hydrates (ICGH8), 28 July 2014 - 1 August 2014 (Beijing, China).

[img]
Preview
(Document in English)

PDF (Author's version) - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader
471kB

Abstract

This paper reports an experimental study on the effect of the concentration and the carbon chain length of surfactants on the formation kinetics of gas hydrates in a quiescent CO2/CH4/water system. Sodium alkyl sulfates with different carbon chain length (C8, C10, C12, C14, C16 and C18) were tested at different concentrations. The experiments were conducted in a batch configuration, at a temperature of 275 K and with an initial gas pressure of about 3.3 MPa. For each system studied, hydrate crystallization was triggered by suddenly injecting a small amount of THF (4,000 ppm) directly into the surfactant solution in contact with the gas-hydrate-former phase at 275 K and 3.3 MPa. The long induction time for hydrate formation usually observed for these systems at the pressure and temperature conditions used in this study was thus eliminated. The experimental results show that, of the six surfactants tested, only the sodium dodecyl (C12) sulfate efficiently promotes the formation of CO2-CH4 binary hydrate under quiescent conditions. A minimum concentration of 500 ppm of the C12 surfactant was however necessary to obtain a beneficial effect on hydrate formation, and the rate of hydrate crystallization was observed to level off for the surfactant concentrations higher than 3,000 ppm. For the systems containing the C8 and C10 surfactants, which have a Krafft temperature lower than 275 K, the presence or absence of micelles in the surfactant solution does not have any effect on the hydrate formation kinetics.

Item Type:Conference or Workshop Item (Poster)
HAL Id:hal-02005618
Audience (conference):International conference proceedings
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Other partners > Total (FRANCE)
Other partners > Université de Pau et des Pays de l'Adour - UPPA (FRANCE)
Laboratory name:
Statistics:download
Deposited By: Jean-philippe TORRE
Deposited On:04 Feb 2019 10:09

Repository Staff Only: item control page