Safety of massive hydrogen storage and transportation technology by Organic Chemical Hydride（ OCH） method is reviewed. In the method, hydrogen is chemically fixed to toluene and converted to methylcyclohexane（ MCH） which are component of gasoline. The potential risk of massive hydrogen storage and transportation can be reduced to conventional gasoline or crude oil by this method, since hydrogen is fixed to gasoline component chemically and storage and transportation as same as gasoline under ambient pressure and temperature in the liquid state. Chiyoda Corporation has established the system technology for massive hydrogen storage and transportation by OCH method through the novel dehydrogenation catalyst and process. In this paper, OCH method and status of the system is also introduced.
Gas clathrate hydrates of hydrocarbon, or methane hydrates, are regarded as a potential alternative energy resource of conventional oil and natural gas, but no technically or economically feasible production technique has been established. To consider the safety of a hypothetical gas production operation, thermodynamic nature of the material and petro-physical condition of host sediments should be considered as well as facility and devices in applied production systems. Its endothermic nature may avoid uncontrolled situation of gas hydrate dissociation process and subsequent hazards such as large-scale seafloor instability. There can be five modes of hazards related to methane hydrate, namely, 1） naturally happening gas hydrate dissociation that cause impacts of seafloor stability and climate, 2） accidental formation of gas hydrate in a flowline that prevents flow causes subsequent troubles. 3） unintentional methane hydrate dissociation by human activities and its impacts on safety of facilities and personnel, and eco-system, 4） intentional methane hydrate dissociation for gas production and impacts on safety of facilities and personnel, and eco-system, Moreover, common operational risks of offshore oil and gas drilling and production should be considered. For the first offshore production test of methane hydrate in 2013, a hazard identification work was done and recommendation from the analysis was implemented in the actual operation.