Chemistry: electrical and wave energy – Processes and products – Electrostatic field or electrical discharge
Patent
1979-07-31
1981-01-13
Andrews, R. L.
Chemistry: electrical and wave energy
Processes and products
Electrostatic field or electrical discharge
204129, C25B 104, C25B 122
Patent
active
042447941
ABSTRACT:
How to produce hydrogen from water was a problem addressed by this invention. The solution employs a combined electrolytical-thermochemical sulfuric acid process. Additionally, high purity sulfuric acid can be produced in the process.
Water and SO.sub.2 react in electrolyzer (12) so that hydrogen is produced at the cathode and sulfuric acid is produced at the anode. Then the sulfuric acid is reacted with a particular compound M.sub.r X.sub.s so as to form at least one water insoluble sulfate and at least one water insoluble oxide of molybdenum, tungsten, or boron. Water is removed by filtration; and the sulfate is decomposed in the presence of the oxide in sulfate decomposition zone (21), thus forming SO.sub.3 and reforming M.sub.r X.sub.s. The M.sub.r X.sub.s is recycled to sulfate formation zone (16). If desired, the SO.sub.3 can be decomposed to SO.sub.2 and O.sub.2 ; and the SO.sub.2 can be recycled to electrolyzer (12) to provide a cycle for producing hydrogen.
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"Fundamental Aspects of Systems for the Thermochem. Prod. of H.sub.2 from H.sub.2 O", by M. G. Bowman, pp. 1-10, 1974.
"H.sub.2 Prod. by Low Voltage Electrolysis in Combined Thermochem. & Electrochem. Cycles", by M. G. Bowman et al., E.C.S. Abstract No. 232, 1974.
Bowman Melvin G.
Hollabaugh Charles M.
Andrews R. L.
Denny James E.
Gaetjens Paul D.
Slade Elizabeth O.
The United States of America as represented by the United States
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