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Characteristics of Bunsen Reaction using Ultrasonic Irradiation in Sulfur-iodine Hydrogen Production Process

황-요오드 수소 제조 공정에서 초음파 조사를 이용한 분젠 반응의 특성

  • Kim, Hyo Sub (Department of Chemical Engineering & Applied Chemistry, Chungnam National University) ;
  • Lee, Dong Hee (Department of Chemical Engineering & Applied Chemistry, Chungnam National University) ;
  • Lee, Jong Gyu (Climate and Energy Research Group, Research Institute of Industrial Science & Technology) ;
  • Park, Chu Sik (Hydrogen Energy Research Center, Korea Institute of Energy Research) ;
  • Kim, Young Ho (Department of Chemical Engineering & Applied Chemistry, Chungnam National University)
  • 김효섭 (충남대학교 응용화학공학과) ;
  • 이동희 (충남대학교 응용화학공학과) ;
  • 이종규 (포항산업과학연구원 기후에너지연구그룹) ;
  • 박주식 (한국에너지기술연구원 수소연료전지연구) ;
  • 김영호 (충남대학교 응용화학공학과)
  • Received : 2017.10.16
  • Accepted : 2017.11.20
  • Published : 2018.02.10

Abstract

In Bunsen reaction section for the integrated operation of sulfur-iodine (SI) process, $I_2$ and $H_2O$ reactants are supplied as dissolved species in an $HI_x$ solution. Most of the $H_2SO_4$ product is found in the $HI_x$ phase when Bunsen reaction is performed using the $HI_x$ solution and $SO_2$ feed, so that the volume ratio of the $H_2SO_4$ phase to the $HI_x$ phase is very low. In this study, we investigated the effects of ultrasound irradiation on Bunsen reaction using the $HI_x$ solution to improve its phase separation performance. With ultrasound irradiation, the amount of $H_2SO_4$ moved to the $H_2SO_4$ phase from the $HI_x$ phase increased by up to 58.0 mol% and the volume of $H_2SO_4$ phase also increased by up to 13.1 vol%. In particular, the effect of ultrasound irradiation on the phase separation was improved with decreasing operating temperature, $I_2$ and $H_2O$ feed concentrations. The ultrasound irradiation induces the formation of additional $H_2O$ molecules by shifting microscopically the reaction equilibrium in the $HI_x$ phase. Afterward, the additionally generated $H_2O$ and isolated $H_2SO_4$ molecules form more $H_2SO_4{\cdot}xH_2O$ (x = 5-6) clusters that can be moved to the $H_2SO_4$ phase.

Keywords

sulfur-iodine process;hydrogen production;bunsen reaction;HIx solution;ultrasonic irradiation

Acknowledgement

Supported by : Chungnam National University

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