NOVELTY - A carbon dioxide isolation system (3) comprises hydrate production apparatus (11) which forms source gas (G0) containing carbon dioxide and methane by gas bubble, reacts source gas and raw water (L1), and generates mixed gas hydrate (S), gas-liquid separation apparatus (12) which separates liquid containing mixed gas hydrate generated by hydrate production apparatus from unreacted source gas, and adjustment part which adjusts amount of carbon dioxide in mixed gas hydrate by adjusting gas-liquid interface product and/or reaction time of source gas and raw water.    USE - A carbon dioxide isolation system for isolating carbon dioxide from mixed gas containing methane and carbon dioxide (claimed).    ADVANTAGE - The carbon dioxide isolation system has a compact structure and improves separation efficiency of carbon dioxide.    DETAILED DESCRIPTION - A carbon dioxide isolation system (3) comprises hydrate production apparatus (11) which forms source gas (G0) containing carbon dioxide and methane by gas bubble, reacts source gas and raw water (L1), and generates mixed gas hydrate (S), gas-liquid separation apparatus (12) which separates liquid containing mixed gas hydrate generated by hydrate production apparatus from unreacted source gas, and adjustment part which adjusts amount of carbon dioxide in mixed gas hydrate by adjusting gas-liquid interface product and/or reaction time of source gas and raw water. Adjustment part enables amount of carbon dioxide in mixed gas hydrate formed in state in which equilibrium is not established to be greater than the amount of carbon dioxide in mixed gas hydrate generated in state in which equilibrium is established. The system hydrates carbon dioxide, separates carbon dioxide from source gas, and leaves large amount of methane. An INDEPENDENT CLAIM is included for method of isolating carbon dioxide.    DESCRIPTION OF DRAWING(S) - The drawing shows a block diagram of the carbon dioxide isolation system.    Carbon dioxide isolation system (3)    Hydrate production apparatus (11)    Gas-liquid separation apparatus (12)    Source gas (G0)    Raw water (L1)    Mixed gas hydrate (S)