This study evaluated the CO₂ separation characteristics for gas–solid contact between CH₄ and CO₂ mixtures and stoichiometric tetrahydrofuran (THF) hydrate to elucidate system temperature and pressure effects on clathrate hydrate gas separation performance. The CO₂ molecules in the system were incorporated selectively into the hydrate phase during the gas–solid contact at lower temperatures. The CO₂ selectivity for gas uptake was higher at higher-pressure conditions at a constant temperature. Results suggest that greater driving force for gas uptake to stoichiometric THF hydrate crystals contributes to improved CO₂ selectivity from the CH₄–CO₂ mixture. Effects of the driving force on CO₂ separation from CH₄–CO₂ mixture contrasted against those of gas–liquid systems using THF aqueous solution or liquid water. The different effects are expected to derive from differences in gas uptake process between gas–solid and gas–liquid systems and differences in cages for competition for gas uptake.

这项研究评估了CH ₄和CO ₂混合物与化学计量的四氢呋喃（THF）水合物之间气固接触的CO ₂分离特性，以阐明系统温度和压力对笼形水合物气体分离性能的影响。在较低温度下气固接触过程中，系统中的CO ₂分子选择性地掺入水合物相中。在恒定温度下的高压条件下，气体吸收的CO ₂选择性更高。结果表明，更大的气体吸收化学计量的THF水合物晶体的驱动力有助于改善CH ₄ -CO ₂对CO _2的选择性。混合物。对CO的驱动力的影响₂从CH分离₄ -CO ₂混合物对比对那些使用THF水溶液或液态水气-液系统的。预期不同的影响将来自气固系统和气液系统之间的气体吸收过程的差异以及气体吸收竞争的笼子的差异。