DISCUSSION
In our recent work, the synergistic effect of amino acids and spiral
agitation on promoting hydrate growth kinetics was
evaluated24. Excitingly, the composite system performs
well under mild conditions, and a storage capacity of 146 V/V was
obtained in 0.3 mmol/L L-methionine solution under 3.8 MPa and 60 rpm.
However, when the revolving speed was reduced to 30 rpm, the promoting
effect became poor, and the maximum methane storage capacity of 128 V/V
was only achieved in the system of 2 mmol/L L-methionine.
In comparison, the synergistic
effect of nano-promoters and spiral agitation performs better on
promoting the growth kinetics of hydrates, and the excellent promotion
was also observed under milder conditions. It is clear from Figure 10
that methane storage capacities in -COO-@PSNS and
-SO3-@PSNS systems are 141.33 V/V and
147.28 V/V separately for 30 rpm, which increase by 10.4% and 15.1%
compared with L-methionine under the same conditions, and methane uptake
rate in -COO-@PSNS systems is faster than that in
amino acid systems. Moreover, it is worth noting that the concentration
of nano-promoters is only 1 mmol/L, which is also easy to synthesize and
store. Therefore, in view of the excellent promoting of nano-promoters
under mild conditions, its synergistic effect with spiral agitation
provides a new insight for the industrial production of SNG
technologies.