Exemplary, Fig. (a-b) shows the results obtained from the feed gas with 15 mol% CO 2 . Results for the other compositions can be found in the ESI † (cf. Figs. ). When it comes to the capture phase, all previous observations recur. Focusing on the regeneration phase, the CO 2 fraction at the outlet remains almost unaltered until the pressure drops below the equilibrium pressure. Consequently, the mixed hydrate dissociates and releases large amounts of the previously captured gas rich in CO 2 . This process is accompanied by a sharp rise in CO 2 concentration at the outlet, peaking at approximately 70 mol% once the reactor pressure drops to 1 atm. Since no gas is fed during the entire regeneration period, this concentration can be understood as an upper bound to the composition of the gas captured in the hydrate. As is shown in Fig. (b), the aggregated masses of CO 2 and N 2 are increasing during capture and decreasing during regeneration. After a full cycle, the aggregated masses return to nearly zero, providing a reliable indicator for the accuracy of our measurements. Since for all four different feed gas compositions the regeneration period is significantly shorter than the capture phase -when executed at these conditions -an HBCC twin process is constrained by capture and not regeneration rates.