A Review of Gas Capture and Liquid Separation Technologies by CO2 Gas Hydrate

Gas hydrates, being promising energy sources, also have good prospects for application in gas separation and capture technologies (e.g., CO2 sequestration), as well as for seawater desalination. However, the widespread use of these technologies is hindered due to their high cost associated with high power consumption and the low growth rates of gas hydrates. Previous studies do not comprehensively disclose the combined effect of several surfactants. In addition, issues related to the kinetics of CO2 hydrate dissociation in the annealing temperature range remain poorly investigated. The presented review suggests promising ways to improve efficiency of gas capture and liquid separation technologies. Various methods of heat and mass transfer enhancement and the use of surfactants allow the growth rate to be significantly increased and the degree of water transformation into gas hydrate, which gives impetus to further advancement of these technologies. Taking the kinetics of this into account is important for improving the efficiency of gas hydrate storage and transportation technologies, as well as for enhancing models of global climate warming considering the increase in temperatures in the permafrost region.

Automated summary

Gas hydrates have potential as energy sources and applications in gas separation, capture technologies, and seawater desalination. However, these technologies face challenges due to high power consumption, low growth rates, and lack of understanding about the combined effects of surfactants and the kinetics of CO2 hydrate dissociation. The presented review suggests ways to improve efficiency, such as using surfactants and enhancing heat and mass transfer, which can increase growth rates and transform water into gas hydrates. Considering the kinetics is important for gas hydrate storage, transportation technologies, and climate warming models in permafrost regions.