Improved Methane Hydrate Formation and Dissociation with Nanosphere-Based Fixed Surfactants As Promoters

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• 作者：Fei Wang ; Guo-Qiang Liu ; Han-Lin Meng ; Gang Guo ; Sheng-Jun Luo ; Rong-Bo Guo
• 刊名：ACS Sustainable Chemistry & Engineering
• 出版年：2016
• 出版时间：April 4, 2016
• 年：2016
• 卷：4
• 期：4
• 页码：2107-2113
• 全文大小：417K
• ISSN：2168-0485

文摘

The fixation of surfactants is very important in surfactant-promoted gas hydrate formation. In this work, three surfactants were fixed on the surface of polystyrene nanospheres through emulsion polymerization (named as Surfactant@PSNS) and then used in methane hydrate formation and dissociation, which were sodium dodecyl sulfate (SDS), cetyltrimethylammonium bromide (CTAB), and dodecyl alcohol ethoxylates (AEO). The fixation of the surfactants could reduce the induction periods and improve the apparent densities and storage capacities of the formed hydrates, especially at low surfactant concentrations. During hydrate dissociation, the fixation of surfactants resulted in the hydrates dissociating more slowly. The methane recoveries were improved from 76.37%, 27.87%, and 32.35% to 87.55%, 43.43%, and 60.20% for the fixation of SDS, CTAB, and AEO, respectively. Moreover, with surfactants fixed, the foam generation during hydrate dissociation was obviously controlled.