For the analysis of the mass balance, the mass flow and the CO 2 fraction at the outlet are monitored throughout the regeneration period. The monitoring is terminated once the mass flow drops below the detection limit of the flow sensors (< 0.2 slm). Note that due to the effect of self-preservation , mass flow can come to an apparent halt although a significant amount of mixed hydrate is still preserved. This results in a mismatch in the total mass captured and regenerated but can be reliably detected. It has to be noted that for continuous measurements with a focus on closing the mass balance, an accurate knowledge of the inlet mass flow during the pressurization period is essential. In such cases, the reactor is pressurized in a controlled manner by adjusting a needle valve before the flow indicator at the reactor inlet.