Purification of Sulfuric and Hydriodic Acids Phases in the Iodine-sulfur Process

Abstract

Abstract: Iodine-sulfur(IS) thermochemical water-splitting cycle is the most promising massive hydrogen production process.To avoid the undesirable side reactions between hydriodic acid(HI) and sulfuric acid(H₂SO₄), it is necessary to purify the two phases formed by the Bunsen reaction.The purification process could be achieved by reverse reaction of the Bunsen reaction.In this study, the purification of the H₂SO₄ and HI Phases was studied.The purification proceeded in both batches and the continuous mode, the influences of operational parameters, including the reaction temperature, the flow rate of nitrogen gas, and the composition of the raw material solutions, on the purification effect, were investigated.Results showed that the purification of the H₂SO₄ phase was dominantly affected by the reaction temperature, and iodine ion in the sulfuric acid phase could be removed completely when the temperature was above 130℃;although, the purification effect of the HI phase improved with increasing of both the flow rate of nitrogen gas and temperature.

Key words: iodine-sulfur process, H₂SO₄ phase, hydriodic acid phase, purification, reverse Bunsen reaction

摘要： Iodine-sulfur(IS) thermochemical water-splitting cycle is the most promising massive hydrogen production process.To avoid the undesirable side reactions between hydriodic acid(HI) and sulfuric acid(H₂SO₄),it is necessary to purify the two phases formed by the Bunsen reaction.The purification process could be achieved by reverse reaction of the Bunsen reaction.In this study,the purification of the H₂SO₄ and HI Phases was studied.The purification proceeded in both batches and the continuous mode,the influences of operational parameters,including the reaction temperature,the flow rate of nitrogen gas,and the composition of the raw material solutions,on the purification effect,were investigated.Results showed that the purification of the H₂SO₄ phase was dominantly affected by the reaction temperature,and iodine ion in the sulfuric acid phase could be removed completely when the temperature was above 130℃;although,the purification effect of the HI phase improved with increasing of both the flow rate of nitrogen gas and temperature.

关键词: iodine-sulfur process, H₂SO₄ phase, hydriodic acid phase, purification, reverse Bunsen reaction

BAI Ying, ZHANG Ping, GUO Hanfei, CHEN Songzhe, WANG Laijun, XU Jingming. Purification of Sulfuric and Hydriodic Acids Phases in the Iodine-sulfur Process[J]. , 2009, 17(1): 160-166.

白莹, 张平, 郭翰飞, 陈崧哲, 王来军, 徐景明. Purification of Sulfuric and Hydriodic Acids Phases in the Iodine-sulfur Process[J]. , 2009, 17(1): 160-166.

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