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Citation: BAI Ying, ZHANG Ping, QU Yong-Shui. Bunsen Reaction in Thermochemcal Iodine-sulfur Cycle[J]. Chinese Journal of Applied Chemistry, ;2009, 26(3): 292-296. shu

Bunsen Reaction in Thermochemcal Iodine-sulfur Cycle

1.
Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 102201

Corresponding author: ZHANG Ping,
Received Date: 25 February 2008
Available Online: 15 May 2008
Fund Project: 国防基础科研资助项目(A1420080145) (A1420080145)

Iodine-sulfur(I-S) cycle is one of the most promising thermochemical water-splitting processes for massive hydrogen production in the future with a high heat to hydrogen conversion efficiency.In this work,the separation characteristics of the two phases,sulfuric acid phase and polyhydriodic acid(HI_x) phase,formed in Bunsen reaction of the cycle,were investigated.The effects of temperature of the solution and molar fraction of iodine in the mixture of H₂SO₄ and HI_x on the separation characteristics were studied.The influence of the molar ratio of iodine to water in the Bunsen reaction on the phase separation and saturation of I₂ was studied.Results show that the addition of excess iodine causes the formation of two insoluble liquid phases,the amount of excess iodine for the phase separation increases with the increasing of temperature and reaches the highest at 60 ℃.The separation characteristics are notably affected by molar ratio of iodine to water.If n(I₂):n(H₂O)1:8,the two acids can not be separated;if n(I₂):n(H₂O)1:5,iodine in the products may solidify at room temperature.In addition,the concentrations of H⁺,I^-,SO₄^2- and I₃^- in the whole process of continuous SO₂ addition were determined.Based on these results,possible reactions in Bunsen reaction were assumed and suitable reaction conditions were proposed.These results are beneficial to the selection of the operational parameters for Bunsen section of IS process.
- I-S cycle,
- Bunsen reaction,
- separation characteristics,
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