(746f) Characterization of Hydrate-Water Anti-Adhesion Under Surface-Active Agents

This talk presents the anti-adhesion behaviors of solid hydrate particle at the water-oil interface under various surface-active agents. Hydrophobic silica nanoparticles or sorbitan monolaurate (Span 20) at interface prevents the formation of a capillary bridge between the cyclopentane (CP) hydrate particle and aqueous phase [1]. The maximum pushing force between hydrate particle and interface was defined as “anti-adhesive force” and measured by microbalance. The silica nanoparticles have an aggregative property at interface, and they form the hydrophobic particle layer at water-oil interface. They can prevent adhesion of aqueous phase to the hydrophilic surface of the probe, and this anti-adhesive effect is not changed by an addition of sodium dodecyl sulfate (SDS). On the other hand, Span 20 makes the hydrate surface to be wetted with oil. The addition of SDS dramatically decreases the interfacial tension when Span 20 was used, and emulsion drops were formed and adsorbed on the hydrate surface, which can make hydrate particles heavier. Thus, silica nanoparticles have a good potential for anti-agglomerants (AAs) with a relatively smaller dosage and less affected by the presence of surfactant. In addition, this talk will discuss the effect of naphthenic acids and salts on the anti-adhesive behavior of hydrate particle.

1. Min, S. Baek, and Jae W. Lee, Anti-adhesive behaviors between solid hydrate and liquid aqueous phase induced by hydrophobic silica nanoparticles, Langmuir, 2016, 32 (37), pp 9513–9522.