Absorption behaviors of SO2 in HI acid for the iodine-sulfur thermochemical cycle
Absorption behaviors of SO2 in HI acid for the iodine-sulfur thermochemical cycle
复制标题
碘-硫热化学循环中 HI 酸中 SO2 的吸收行为
DOI：
10.1016/j.ijhydene.2017.09.161
复制
发表时间：
2017
影响因子：
7.2
通讯作者：
Zhang Ping
中科院分区：
文献类型：
--
作者：
Zhou Chenglin;Chen Songzhe;Wang Laijun;Zhang Ping
本生反应是碘硫热化学制氢过程中的一个重要反应，它是由碘、二氧化硫和水反应生成硫酸和碘酸的过程。为了研究本生反应动力学，关联SO2压降与反应时间的关系，需要研究SO2在HI酸中的物理吸收。首次研究了不同HI浓度、吸收温度和SO2分压条件下HI酸吸收SO2的行为。结果表明，HI溶液中SO2的吸收量随SO2压力和HI酸浓度的增加而增加，而温度对HI溶液中SO2的吸收影响较为复杂。吸收SO2后的HI溶液中检测到S和SO 42-，在某些情况下，特别是在高压或高温条件下，还检测到碘，表明发生了化学吸收，导致违反物理吸收规律。认为HI与SO2的氧化还原反应及其生成的产物是化学吸收的主要原因。
Bunsen reaction, which produces H2SO4and HI acids from the reaction of I2, SO2and H2O, is a crucial reaction for the iodine–sulfur thermochemical hydrogen production process. To study the reaction kinetics of Bunsen reaction by correlating SO2pressure drop with reaction time, the physical absorption of SO2in HI acid should be investigated. The absorption behaviors of SO2in HI acid were firstly studied under various conditions, including different HI concentration, absorption temperature, and SO2partial pressures. The results show that the absorption amount of SO2in HI solution increases with both the pressure of the SO2and HI acid concentration, while the effect of temperature on SO2absorption in HI solution is complex. S and SO42−were detected in HI solutions after SO2absorption, and iodine was found in some cases, especially under the conditions of high pressure or high temperature, indicating chemical absorption occurred, which leads to the disobeying of the physical absorption rules. It is thought that the redox reaction between HI and SO2and the formed products are the main reasons of chemical absorption.