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Mechanism for the complex micellar system of sodium dodecyl sulfate/octylphenol ethoxylate OPE9 to solubilize methane

  • Yinghua Zhang
  • Yi Zhang
  • Zhian HuangEmail author
  • Yukun Gao
  • Shiwei Ding
  • Hui Wang
  • Min Zhang
ISMSSE 2018
  • 72 Downloads
Part of the following topical collections:
  1. Mine Safety Science and Engineering

Abstract

Surfactant solutions are widely used in solubilizing methane, but there is a lack of research on the optimum ratios of surfactant solutions and their mechanism. In this study, surfactants sodium dodecyl sulfate (SDS) and octylphenol ethoxylate OPE9 (Triton X-100) were selected to better understand the mechanism of the surfactant solution to solubilize methane from a microscopic aspect. The mixed SDS and Triton X-100 solution was proven greater at methane solubilization than a single-component SDS, because it generated a higher number of micelles with hydrophobic cores. When the SDS–to–Triton X-100 concentration ratio was 1:4, the lowest critical micelle concentration, the strongest interaction between SDS and Triton X-100, the maximum absolute value of Gibbs free energy, and the maximum value of viscosity were observed. This indicated that the solution was most likely to generate micelles with a hydrophobic environment and that these micelles were favorable for the methane solubilization. This solution also showed a greater uniformity of micelles, a smaller micelle particle size, and a relatively compact micelle structure. It was deduced that methane stays longer in the micelle core of this structure, which can facilitate methane solubilization. The optimum SDS–to–Triton X-100 ratio to solubilize methane was shown to be 1:4.

Keywords

Surfactant SDS/Triton X-100 Solubilization Methane micelle 

Notes

Funding information

This work was financially supported by the Project No. 51474017 provided by the China National Natural Science Foundation, Project No. E21724 provided by the Work Safety Key Lab on Prevention and Control of Gas and Roof Disasters for Southern Coal Mines of China, and Project No. WS2018B03 provided by the State Key Laboratory Cultivation Base for Gas Geology and Gas Control (Henan Polytechnic University).

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Copyright information

© Saudi Society for Geosciences 2019

Authors and Affiliations

  1. 1.State Key Laboratory of High-Efficient Mining and Safety of Metal MinesUniversity of Science and Technology Beijing, Ministry of EducationBeijingChina
  2. 2.Work Safety Key Lab on Prevention and Control of Gas and Roof Disasters for Southern Coal MinesHunan University of Science and TechnologyXiangtanChina
  3. 3.State Key Laboratory Cultivation Base for Gas Geology and Gas ControlHenan Polytechnic UniversityJiaozuoChina

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