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Chemical and process design studies of thermochemical cycles for hydrogen production

Author
Krikorian, O. H.
Published
United States : [publisher not identified], 1977.
[Oak Ridge, Tennessee] : [U.S. Atomic Energy Commission], 1977.
Physical Description
microfiche : negative ; 11 x 15 cm
Additional Creators
Elson, R. E., Otsuki, H. H., and Pearson, R. K.

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Summary
The ZnSe thermochemical cycle has been modified recently to convert ZnCl2 directly to ZnO and reduce the amount of ZnSO4 that needs to be decomposed at high temperatures. The modified cycle shows significant advantages in efficiency and process design. Exploratory research on the reaction, ZnCl2(l) + H2O(g) ..-->.. ZnO(s) + 2 HCl(g), showed the reaction rate to be quite rapid; i.e., 53 percent of equilibrium being attained in 2s at 800 degree K. Detailed research has also been conducted on the kinetics and mechanism of decomposition of H2Se. A process design and economic analysis of the modified cycle indicates the following: overall thermal efficiency is approximately 42 percent, and hydrogen production cost is approximately $13.22/10/sup 6/ kj in 1976 dollars for a plant producing 27,000 kg H2/h. In the CH4--CH3OH cycle, attempts thus far to convert CH3OH to CH4 by reaction with metal oxides and SO2 have led to unacceptably high amounts of H2O, CO2 and organic compounds as by-products. In future studies on this cycle, the lower oxides of As, Sb, and V will be explored as reducing agents for CH3OH.
Report Numbers
UCRL-79368; CONF-770436-1
Other Subject(s)
Collection
U.S. Atomic Energy Commission depository collection.
Note
DOE contract number: W-7405-ENG-48
OSTI Identifier 7212183
Research organization: California Univ., Livermore (USA). Lawrence Livermore Lab.
View MARC record | catkey: 47040258