Download or read book The Effects of Mixed Promoters on Gas Hydrate Formation written by Jean-Sébastien Renault-Crispo and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "Gas hydrates are studied for a wide variety of industrial applications extending from exploitation of natural gas to gas storage, transportation and separation. A stronger understanding of the kinetics of various hydrate promoters is necessary to pursue the large-scale implementation of such technologies. This thesis investigates gas hydrate growth and dissolution of different combinations of known kinetic and thermodynamic promoters. A novel method of analyzing kinetics for carbon dioxide gas hydrates is developed due to the high variability in gas consumption rates. A first-order response between gas consumption and induction time is shown for carbon dioxide gas hydrates. This is attributed to the different quantities of dissolved gas at nucleation owing to the different induction times. This behaviour is not observed for methane hydrates due to longer average induction times and lower methane solubility in water than carbon dioxide. This new method is used to inspect the carbon dioxide hydrate kinetics of adding multi-walled carbon nanotubes (MWCNTs) to a tetrabutylammonium bromide (TBAB) solution. The addition of MWCNTs does not result in a change in the actual hydrate growth rate but only in the dissolution rate, hinting that hydrate growth is not limited by carbon dioxide transfer at the gas-liquid interface. In another study, the kinetic promoter, sodium dodecyl sulfate (SDS), is added to the thermodynamic promoter TBAB in a methane hydrate system over a range of different concentrations of both promoters. The growth rates of pure TBAB systems decrease monotonically with increasing TBAB concentration. The addition of SDS to a dilute TBAB solution initially inhibits hydrate growth rate until a threshold SDS concentration is reached at which the system enters a promotion regime. This effect is also observed at high TBAB concentrations whereby the thermodynamic equilibrium is changed. This study highlights the importance of considering the effect of mixtures of hydrate additives on the process of hydrate nucleation and growth." --