Method for producing hydrogen gas-containing material and device for producing hydrogen gas-containing material

A device for producing a hydrogen gas-containing material, the device comprising:

• a line mixer for mixing a first liquid composition with a hydrogen gas, thereby producing a second liquid composition comprising the hydrogen gas, wherein the first liquid composition and the second liquid composition are both in liquid state;
• a liquid-transfer pipe connected to the line mixer;
• a cooler for cooling the second liquid composition in the liquid-transfer pipe connected to the line mixer and causing the second liquid composition to gel or thicken, thereby forming the hydrogen gas-containing material;
• a filling container at an end part of the liquid-transfer pipe;
• and
• a filling device for filling the hydrogen gas-containing material into the filling container at the end part of the liquid-transfer pipe,
• wherein the mixing, the cooling, and the filling are performed without exposing to outside air,
• wherein the first liquid composition comprises:
• a liquid medium;
• and
• a gelling agent or thickener,
• wherein the mixing is at a first temperature that is higher than a gelling temperature of the gelling agent when the first liquid composition comprises the gelling agent, and higher than a temperature at which thickening is prevented in the thickener when the first liquid composition comprises the thickener, and
• wherein the cooling is to a second temperature that is lower than the gelling temperature of the gelling agent when the first liquid composition comprises the gelling agent, and lower than the temperature at which thickening is prevented in the thickener when the first liquid composition comprises the thickener.