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US 4,045,546 AGranted
Process for the preparation of hydrogen
OwnerAnthony A. duPontinventor
Life of this patent
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Abstract
Hydrogen is produced from water by the addition of heat to a series of chemical reactions which comprise the reaction of cadmium with water, and the subsequent recovery of the cadmium for re-use. The equipment used to produce the hydrogen requires only the input of water and heat to produce an output of hydrogen and oxygen gas.
Claims2
A process for generating hydrogen which comprises the following steps:
- (a) reacting cadmium metal with steam to form cadmium oxide (CdO) and hydrogen (H.sub.2);
- (b) reacting iodine (I.sub.2) with cadmium oxide (CdO) to form cadmium iodide (0CdI.sub.2) and cadmium iodate (Cd(IO.sub.3).sub.2);
- (c) decomposing the cadmium iodate by the introduction of heat to form the corresponding oxide (CdO), and iodine and oxygen gas;
- (d) replacing the cadmium in the cadmium iodide (CdI.sub.2) with lead (Pb) by feeding gaseous cadmium iodide into the bottom of a column of liquid lead and taking gaseous cadmium (Cd) off the top of the column;
- (e) replacing the lead in the resulting lead iodide (PbI.sub.2) with gallium (Ga) to form gallium iodide (GaI.sub.3) and lead (Pb);
- (f) decomposing the gallium iodide by the introduction of heat to recover the original gallium;
- and (g) recycling the recovered gallium into step (e) of the process.
4 more elements
The process for generating hydrogen which comprises:
- (a) reacting cadmium metal with steam to formcadmium oxide and hydrogen;
- (b) reacting iodine with the cadmium oxide to form cadmium iodide and cadmium iodate;
- (c) decomposing the cadmium iodate by the introduction of heat to form cadmium oxide, oxygen and iodine;
- (d) reacting the last-named cadmium oxide with the last-named iodine to form cadmium iodide and cadmium iodate;
- (e) replacing the cadmium in the cadmium iodide with lead to form lead iodide and cadmium;
- (f) replacing the lead in the lead iodide with gallium to form gallium iodide and lead;
- (g) decomposing the gallium iodide by the introduction of heat to recover the original gallium;
- and (h) recycling the recovered gallium into step (f) of the process.
5 more elements
Dependencies are inferred from the claim text.