Novel SF6 gas concentration method using hydrate-based gas uptake and sweating process

Hydrate-based gas separation is a method of separating gas mixtures into their individual components using their differences in thermodynamic properties. The maximum concentration of the target gas is equilibrium -constrained when using a single stage of operation. In this study, we propose a novel hydrate-based gas up-take and sweating process under constant pressure with rising temperature. We theoretically calculated the SF6-N2 gas hydrate pressure-temperature and pressure-gas composition equilibrium conditions to determine operating conditions for the process. Verification experiments conducted below 1 MPa and below 283 K revealed that SF6 was concentrated up to 90 % using this process in a multistep operation.

Automated summary

Hydrate-based gas separation is a method of separating gas mixtures based on their thermodynamic properties. This study proposes a new process for gas absorption and desorption under constant pressure with rising temperature. Theoretical calculations and experimental verification showed that SF6 can be concentrated up to 90% using this process.