Kinetics of hydrated methane storage in microdroplets stablized by low dosage of absorbent polymer
The circulation of rapid hydrate formation is critical to the utilization of hydrate technology.The super absorbent polymer-stabilized surfactant microdroplets(SAP-DS)were prepared by mixing low dosage(0.1%～1.0%)of super absorbent polymer,sodium dodecyl sulfate(SDS)solution,and hydrophobic silica nanoparticles in air at high speed,which was essentially a cluster of active dry solution modified by polymer.At 8.0 MPa and 274.2 K,these surfactant microdroplets were used for methane storage as hydrates.And the formation kinetics of methane hydrates in microdroplets were studied.Results indicate that the loose polymer-modified microdroplets can provide numerous crisscrossing channels for gas transfer,which greatly increases the surface area for gas-droplet contact.Each droplet has a stable gel structure and surface activity.Microdroplets stabilized by polymers can promote the rapid formation of methane hydrate.Their gas storage capacity can reach as high as 152.5～173.3 cm3·g-1,and the gas storage rate reaches up to 7.62～19.70 cm3·(g·min)-1.The highest gas storage capacity is achieved by the microdroplets with a mass fraction of 0.1%polymer.The SAP-DS can maintain relatively high methane uptake of 170 cm3·g-1 before the seventh cycle,while the uptake in the twelfth cycle is only attenuated by 14.7%compared to the first cycle.The findings can provide a reference for the large-scale rapid circulated storage and transportation of natural gas in the form of hydrates.
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