Patent ID: 8217209

Claim:
A process for production of gas hydrate comprising: a gas hydrate production step of reacting raw material gas and water with each other to produce gas hydrate; a first cooling step of cooling the gas hydrate produced in the gas hydrate production step; a depressurizing step of depressurizing the gas hydrate cooled in the first cooling step to atmospheric pressure; and a second cooling step of recooling the gas hydrate depressurized in the depressurizing step into a storage state, wherein a gas hydrate cooling temperature T (° C.) in the first cooling step is set to a temperature equal to a lower limit cooling temperature t 1 (° C.)+t 2 (° C.), the lower limit cooling temperature t 1 (° C.)+t 2 (° C.) being a methane equilibrium temperature t 1 (° C.) or an equilibrium temperature t 1 (° C.) of a gas mixture consisting of methane and propane, forming the gas hydrate, added with a correction temperature t 2 (° C.) depending on a component of the gas hydrate, the correction temperature t 2 being set to 40° C. or 50° C., and when the gas hydrate cooling temperature T (° C.) in the first cooling step is more than the freezing point (0° C.), the gas hydrate cooling temperature T (° C.) is set to a temperature range of −10° C. to 0° C.