Experimental investigation of CO(2) uptake in CO(2) hydrates formation with amino acids as kinetic promoters and its dissociation at high temperature

The dissociation of CO(2) gas hydrates (GH) with amino acid kinetic promoters and without promoters was studied at a high temperature of 90 °C for a period of 20 min to understand the percentage of CO(2) gas and to select the best promoter that aids CO(2) gas entrapment along with stability at a high temperature. The possibility of using four hydrophobic food grade amino acids, namely cysteine, valine, leucine, and methionine, and one surfactant, lecithin, as kinetic promoters for CO(2) GH has been studied. The amino acids were added 0.5 g (wt%), and lecithin was added 5 g for the GH production. Furthermore, the amino acids leucine and methionine gave some positive results, therefore, these amino acids were carried further for the experimentation purpose in the production of CO(2) GH. Also, a combinational use of these amino acids was studied to investigate the effect on % CO(2) retention in comparison to the normal GH. From the results, it was observed that the stability of GH decreases with an increase in temperature, but the addition of promoters, especially leucine + methionine + lecithin increased the CO(2) uptake during GH formation.