Influence of Piperazine on CO2 Hydrate Dissociation Equilibrium Conditions

Abstract

Carbon dioxide hydrate has a broad application such as the separation and capture of carbon dioxide and cold storage in hydrates. However, its industrial application is limited by the problems of hydrate formation conditions of lower temperature or higher pressure, long induction time, and slow growth rate. Thermodynamic promoters can effectively improve the hydrate formation conditions. Piperazine is selected as a new promoter to investigate the influence on carbon dioxide hydrate dissociation equilibrium conditions in this paper. Compared with pure carbon dioxide forming structure I hydrate, the addition of piperazine forms structure II hydrate, and hydrate dissociation conditions significantly move to lower pressures or higher temperatures. The higher the concentration of piperazine, the better the promoting effect.