Abstract
The effects of organic phase change material (PCM) and surfactant on HCFC141b hydrate nucleation are investigated under quiescent conditions. The surfactants Tween80 and Span80 are chosen as emulsifiers, and the mixture of PCM n-decanoic acid (CA) and dodecyl alcohol (DE) is used as promoter. The emulsion of HCFC141b + CA–DE (the mass ratio of CA to DE is 1:1) + Tween80 or Span80 + H2O is prepared, where CA–DE is dispersed in water and HCFC141b is dissolved into CA–DE. The hydrophobic CA–DE droplets create an increased local HCFC141b concentration, and organize the surrounding water into a clathrate-like structure. Additives of 1 wt% CA–DE and 1 wt% Tween80 have the best promotion effect on the nucleation of HCFC141b hydrate. The nucleation of HCFC141b hydrate has a stochastic nature and the additives (CA–DE, Tween80 and Span80) reduce the scatter of the induction time of HCFC141b hydrate formation.
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