Contract grant sponsor: National Natural Science Foundation of China.
Study on Apparent Kinetics of the Reaction between Sulfuric and Hydriodic Acids in the Iodine–Sulfur Process
Article first published online: 24 JUL 2013
© 2013 Wiley Periodicals, Inc.
International Journal of Chemical Kinetics
Volume 45, Issue 9, pages 588–595, September 2013
How to Cite
Li, N., Zhang, P., Chen, S., Wang, L. and Xu, J. (2013), Study on Apparent Kinetics of the Reaction between Sulfuric and Hydriodic Acids in the Iodine–Sulfur Process. Int. J. Chem. Kinet., 45: 588–595. doi: 10.1002/kin.20796
Contract grant number: 20976096.
Contract grant sponsor: State Key S&T Project.
Contract grant number: zdzx 06901.
- Issue published online: 24 JUL 2013
- Article first published online: 24 JUL 2013
- Manuscript Accepted: 11 MAR 2013
- Manuscript Revised: 10 MAR 2013
- Manuscript Received: 1 SEP 2012
- National Natural Science Foundation of China. Grant Number: 20976096
- State Key S&T Project. Grant Number: zdzx 06901
The iodine–sulfur (IS) thermochemical process for hydrogen production is one of the most promising approaches in using high-temperature process heat supplied by a nuclear reactor. This process includes three reactions that form a closed cycle: the Bunsen reaction, in which iodine, water, and sulfur dioxide react to form sulfuric acid and hydriodic acid (HI); HI decomposition; and sulfuric acid decomposition. However, the side reactions between H2SO4 and HI may disturb the operation of the IS closed cycle. For optimal process conditions, the reaction kinetics between H2SO4 and HI should be examined. In this work, a preliminary kinetic study was conducted. Using the initial reaction rate method, the kinetic parameters of the reaction between sulfuric acid and HI, such as the apparent reaction orders and rate constant were determined. For I−, the apparent reaction order was approximately 1.77, whereas the orders for H+ and SO42− were 7.78 and 1.29, respectively. The apparent rate constant at 85 ± 1°C was approximately 2.949 × 10−11 min−1 (mol/L)−9.84. The H+ concentration had more significant influence on the reaction rate than those of SO42− and I−. Such basic data provide useful information for related process design and further kinetics study.