Effects of the operation modes on the HIx phase purification in the iodine–sulfur thermochemical cycle for hydrogen production

In the iodine–sulfur thermochemical water-splitting process for hydrogen production, purification of hydriodic phase (HIx) had to be adopted to eliminate the minor components in the HIx phases (the mixture of mainly HI, H2O, I2 and small amounts of H2SO4), so as to avoid the undesirable side reactio...

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Published inInternational journal of hydrogen energy Vol. 41; no. 36; pp. 15998 - 16001
Main Authors Xu, Lufei, Wang, Laijun, Zhang, Ping, Hu, Songzhi, Li, Daocai, Bai, Shangkui, Chen, Songzhe
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 28.09.2016
Subjects
HIx phase
Iodine–sulfur cycle
Operation mode
Purification
Thermochemical hydrogen production
Iodine–sulfur cycle
Purification
HIx phase
Thermochemical hydrogen production
Operation mode
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Summary:In the iodine–sulfur thermochemical water-splitting process for hydrogen production, purification of hydriodic phase (HIx) had to be adopted to eliminate the minor components in the HIx phases (the mixture of mainly HI, H2O, I2 and small amounts of H2SO4), so as to avoid the undesirable side reactions between HI and H2SO4. In this work, experimental studies on HIx phase purification were carried out. Effects of the operation modes (such as batch operation, continuous operation and the mixed modes of the continuous and discontinuous operation), and process parameters (such as the reaction temperature, feed flowrate of the HIx solution, and the flowrate of the stripping gas N2) on the purification of HIx phase were investigated. The experimental results showed that increase of temperature and N2 flowrate, and decrease of feed flowrate of HIx solution favored the removal of H2SO4 from HIx phase. The purification efficiency would be improved by combining the continuous operation with the batch operation during the purification process. These results were favorable for achieving the closed operation of IS cycle. •Effects of the operation modes on purifying HIx phase were studied.•The reflux and distillation modes for HIx purification were compared.•Various factors influencing the HIx purification were investigated.•The suitable operation modes for HIx phase purification were proposed.
ISSN:0360-3199
1879-3487
DOI:10.1016/j.ijhydene.2016.05.183