Mechanism for the complex micellar system of sodium dodecyl sulfate/octylphenol ethoxylate OPE9 to solubilize methane
- PDF / 884,180 Bytes
- 10 Pages / 595.276 x 790.866 pts Page_size
- 85 Downloads / 169 Views
ISMSSE 2018
Mechanism for the complex micellar system of sodium dodecyl sulfate/octylphenol ethoxylate OPE9 to solubilize methane Yinghua Zhang 1 & Yi Zhang 1 & Zhian Huang 1,2,3
&
Yukun Gao 1 & Shiwei Ding 1 & Hui Wang 1 & Min Zhang 1
Received: 24 October 2018 / Accepted: 16 May 2019 / Published online: 11 June 2019 # Saudi Society for Geosciences 2019
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
Introduction Coal and gas outburst-prone mines are numerous and widely distributed in many provinces of China (Zhou et al. 2016). Frequent accidents and the great outburst intensity can lead to many casualties (Liu et al. 2017). In addition to complicated geological conditions, outburst disasters are also generally a result of short-term gas adsorption and desorption. Consequently, adsorption and desorption lay the foundation This article is part of the Topical Collection on Mine Safety Science and Engineering * Zhian Huang [email protected] 1
State Key Laboratory of High-Efficient Mining and Safety of Metal Mines, University of Science and Technology Beijing, Ministry of Education, Beijing 100083, China
2
Work Safety Key Lab on Prevention and Control of Gas and Roof Disasters for Southern Coal Mines, Hunan University of Science and Technology, Xiangtan 411201, China
3
State Key Laboratory Cultivation Base for Gas Geology and Gas Control, Henan Polytechnic University, Jiaozuo 454000, China
for outburst disasters (Shemshad et al. 2012; Bhattacharjee et al. 2018). The special interfacial properties of surfactants allow them to raise the formation rate of high-saturation methane hydrate, and play a role in methane solubilization. These two abilities
Data Loading...
