Thermochemical process for manufacture of hydrogen and oxygen from water. [four-step cycle based on CaO and I/sub 2/]
Patent
·
OSTI ID:7344096
Calcium hydroxide and iodine are reacted with each other in the presence of water to produce calcium iodate and calcium iodide, the former of which precipitates from the reaction solution and is obtained by filtration and the latter of which is thereafter separated from the filtrate by evaporation separation. The calcium iodate is heated until it is converted into calcium oxide, whereafter there ensues generation of a mixed gas of iodine and oxygen. The mixed gas is cooled causing the iodine component thereof to solidify and pure oxygen gas is consequently liberated to be obtained as one product. The calcium iodide is solidified and subsequently heated under a current of steam to cause it to undergo conversion into calcium oxide with liberation of hydrogen iodide gas. The hydrogen iodide gas thus liberated is then separated by a known method into iodine and hydrogen which is obtained as another product. The calcium oxide and iodine remaining after separation of oxygen and hydrogen are recycled to serve again as starting reactants. 6 claims, 1 drawing figure.
- Assignee:
- Agency of Industrial Science and Tech.
- Patent Number(s):
- US 3969493
- OSTI ID:
- 7344096
- Country of Publication:
- United States
- Language:
- English
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