Abstract
Silica membranes prepared by chemical vapor deposition were applied to the decomposition reaction of HI of the iodine-sulfur process in order to improve one-pass conversion of HI. Equilibrium conversion of HI is 22% at 723 K without hydrogen removal. Hydrogen was successfully extracted from the decomposition reactor using the silica membranes between 723 and 873 K. HI conversions were increased with an increase in the hydrogen extraction ratio. The maximum HI one-pass conversion was 76.4% at 873 K. The total thermal efficiency can be improved by 1% for this HI conversion by calculating the heat/mass balance of the process. The concentration profile in the reactor was evaluated by using the simple two-dimensional simulation. H2permeances measured by the experimental method were almost the same as those of the simulation, and the membrane reactor system was found to have permeation limitations. Membranes with higher H2permeances should be developed for the membrane reactor.
| Original language | English |
|---|---|
| Pages (from-to) | 5874-5879 |
| Number of pages | 6 |
| Journal | Industrial and Engineering Chemistry Research |
| Volume | 43 |
| Issue number | 18 |
| Publication status | Published - 2004 Sep 1 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Chemical Engineering(all)
- Chemistry(all)
- Industrial and Manufacturing Engineering
- Chemical Engineering (miscellaneous)
- Environmental Science(all)
- Polymers and Plastics
Cite this
Silica membrane reactor for the thermochemical iodine-sulfur process to produce hydrogen. / Nomura, Mikihiro; Easahara, Seiji; Nakao, Shin Ichi.
In: Industrial and Engineering Chemistry Research, Vol. 43, No. 18, 01.09.2004, p. 5874-5879.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Silica membrane reactor for the thermochemical iodine-sulfur process to produce hydrogen
AU - Nomura, Mikihiro
AU - Easahara, Seiji
AU - Nakao, Shin Ichi
PY - 2004/9/1
Y1 - 2004/9/1
N2 - Silica membranes prepared by chemical vapor deposition were applied to the decomposition reaction of HI of the iodine-sulfur process in order to improve one-pass conversion of HI. Equilibrium conversion of HI is 22% at 723 K without hydrogen removal. Hydrogen was successfully extracted from the decomposition reactor using the silica membranes between 723 and 873 K. HI conversions were increased with an increase in the hydrogen extraction ratio. The maximum HI one-pass conversion was 76.4% at 873 K. The total thermal efficiency can be improved by 1% for this HI conversion by calculating the heat/mass balance of the process. The concentration profile in the reactor was evaluated by using the simple two-dimensional simulation. H2permeances measured by the experimental method were almost the same as those of the simulation, and the membrane reactor system was found to have permeation limitations. Membranes with higher H2permeances should be developed for the membrane reactor.
AB - Silica membranes prepared by chemical vapor deposition were applied to the decomposition reaction of HI of the iodine-sulfur process in order to improve one-pass conversion of HI. Equilibrium conversion of HI is 22% at 723 K without hydrogen removal. Hydrogen was successfully extracted from the decomposition reactor using the silica membranes between 723 and 873 K. HI conversions were increased with an increase in the hydrogen extraction ratio. The maximum HI one-pass conversion was 76.4% at 873 K. The total thermal efficiency can be improved by 1% for this HI conversion by calculating the heat/mass balance of the process. The concentration profile in the reactor was evaluated by using the simple two-dimensional simulation. H2permeances measured by the experimental method were almost the same as those of the simulation, and the membrane reactor system was found to have permeation limitations. Membranes with higher H2permeances should be developed for the membrane reactor.
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M3 - Article
VL - 43
SP - 5874
EP - 5879
JO - Industrial & Engineering Chemistry Research
JF - Industrial & Engineering Chemistry Research
SN - 0888-5885
IS - 18
ER -