Method for thermochemical production of hydrogen from water. [barium iodide, carbon dioxide, ammonia, and water cycle]

Patent · Tue Dec 07 00:00:00 EST 1976

OSTI ID:7324959

Ishikawa, H; Nakane, M; Ishii, E; Miyake, Y

A method for the thermochemical production of hydrogen from water is disclosed in which barium iodide, carbon dioxide, ammonia and water are allowed to react with one another and give rise to barium carbonate and ammonium iodide, the ammonium iodide thus produced is thermally decomposed to produce hydrogen, iodine and ammonia, and the hydrogen thus produced is recovered as the product. The by-produced barium carbonate is allowed to react with the iodine remaining after the separation of hydrogen thereby to produce barium iodide, carbon dioxide and oxygen, and the barium iodide and carbon dioxide are recycled to the reaction system. The ammonia which remains after the separation of hydrogen is also recycled to the reaction system. By causing the by-products occurring in the various reactions to be recycled to the relevant reaction systems, hydrogen is efficiently produced from water at a reaction temperature of not more than 800/sup 0/C. 4 claims.

• Assignee: Agency of Industrial Science and Tech.
• Patent Number(s): US 3996342
• OSTI ID: 7324959
• Resource Relation: Patent Priority Date: Priority date 5 Sep 1974, Japan
• Country of Publication: United States
• Language: English

Related Subjects

08 HYDROGEN
HYDROGEN PRODUCTION
THERMOCHEMICAL PROCESSES
OXYGEN
PRODUCTION
AMMONIA
BARIUM IODIDES
CARBON DIOXIDE
WATER
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
CRYOGENIC FLUIDS
ELEMENTS
FLUIDS
HALIDES
HALOGEN COMPOUNDS
HYDRIDES
HYDROGEN COMPOUNDS
IODIDES
IODINE COMPOUNDS
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
NONMETALS
OXIDES
OXYGEN COMPOUNDS
080102* - Hydrogen- Production- Thermochemical Processes