(690a) Kinetic Hydrate Inhibitors: Gas Hydrate Induction Time Probability Distributions and Deviations from Classical Nucleation Theory
AIChE Annual Meeting
2019 AIChE Annual Meeting
Engineering Sciences and Fundamentals
Gas Hydrates Science and Engineering
Thursday, November 14, 2019 - 12:30pm to 12:47pm
Here we detail the use of a high-pressure-stirred-automated-lag-time-apparatus (HPS-ALTA) to enable efficient quantification of methane hydrate formation probability in the presence of a KHI. Typically 100 independent hydrate formation events are obtained for each experimental condition, enabling the construction of smooth induction time probability distributions. We confirm previous findings in that we demonstrate that increasing KHI concentration leads to increased induction times, albeit with diminishing returns as the concentration is increased in the (1-2) wt% range. We also show that although induction times distributions are exponentially distributed for the KHI-free system (consistent with predictions from Classical Nucleation Theory), this is not the case in the presence of a KHI where our experimental data can be best described by a gamma distribution with lower relative standard deviation. This result has significance not only for understanding hydrate formation risk in the presence of KHIs but also for improving our theoretical understanding of the mechanism by which KHIs delay hydrate formation.