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The synergy of spiral agitation and nano-promoters significantly enhances hydrate formation under mild conditions
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  • Xiaolai Zhang,
  • Xiaoyun Shi,
  • Yan He,
  • Guodong Zhang,
  • Fei Wang
Xiaolai Zhang
Shandong University

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Xiaoyun Shi
Qingdao University of Science and Technology
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Yan He
Qingdao University of Science and Technology College of Electromechanical Engineering
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Guodong Zhang
Qingdao University of Science and Technology College of Electromechanical Engineering
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Abstract

Sluggish hydrate kinetics and low methane storage capacity give rise to the limitation of the application of hydrate-based solidified natural gas (SNG) technology. Here, we prepared two nano-promoters of -SO3-@PSNS and -COO-@PSNS, with which, methane hydrate formation in a spiral-agitated reactor under mild conditions was evaluated. Excitingly, spiral agitation enhances hydrate nucleation and initial growth kinetics, while the nano-promoters improve hydrate later growth kinetics, and the synergy of them results in extraordinary hydrate formation kinetic under mild conditions. Large methane storage capacities of 147.28 V/V and 141.33 V/V were obtained in the systems of -SO3-@PSNS and -COO-@PSNS separately under the condition of 3.8 MPa, 275.15 K and 30 rpm, which increase by 85.07% and 77.59% comparing to that in pure water, respectively. The synergy performs better than that of spiral agitation and amino acids, and this may promote the application of SNG technology a step forward.
Dec 2022Published in Chemical Engineering Journal volume 450 on pages 138354. 10.1016/j.cej.2022.138354