Characteristic of the Pressurized Continuous Bunsen Reaction using HI_x Solution

¹ Hydrogen Energy Research Center, Korea Institute of Energy Research, 152, Gajeong-ro, Yuseong-gu, Daejeon 34129, Republic of Korea
² Department of Chemical Engineering and Applied Chemistry, Chungnam National University, 99, Daehak-ro, Yuseong-gu, Daejeon 34134, Republic of Korea

^a kjs77bsy@kier.re.kr
^b cspark@kier.re.kr
^c kskang@kier.re.kr
^d sujung@kier.re.kr
^e mizkee@kier.re.kr
^f chk14@kier.re.kr
^g yh_kim@cnu.ac.kr
^h kkbae@kier.re.kr
^* Corresponding author: kkbae@kier.re.kr

Abstract

The Sulfur-Iodine thermochemical hydrogen production process (SI process) consists of the Bunsen reaction section, the H₂SO₄ decomposition section and the HI decomposition section. The HI_x solution (HI-I₂-H₂O) could be recycled to Bunsen reaction section from the HI decomposition section in the operation of the integrated SI process. The phase separation characteristic of the Bunsen reaction using the HI_x solution was similar to that of SO₂-I₂-H₂O system. However, the amount of produced H₂SO₄ phase was too small. To solve this problem, the study was carried out by the pressurized continuous Bunsen reaction. Bunsen reactions were performed at variation of feed rate of SO₂/O₂ gas in 3 bar of atmosphere. Also, it was performed to check the effects of the residence time in the reservoir on the characteristics of Bunsen products. As the results, the concentration of H₂SO₄ and HI in Bunsen products was increased with increasing the amounts of SO₂. When the residence time in the reservoir increased, the concentration of H₂SO₄ and HI in HI_x phase was decreased by reverse Bunsen reaction.