공업화학 (Applied Chemistry for Engineering)

  • 제29권1호
  • /
  • Pages.56-61
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  • 2018
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  • 1225-0112(pISSN)
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  • 2288-4505(eISSN)
한국공업화학회 (The Korean Society of Industrial and Engineering Chemistry)
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황-요오드 수소 제조 공정에서 초음파 조사를 이용한 분젠 반응의 특성

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

  • 김효섭 (충남대학교 응용화학공학과) ;
  • 이동희 (충남대학교 응용화학공학과) ;
  • 이종규 (포항산업과학연구원 기후에너지연구그룹) ;
  • 박주식 (한국에너지기술연구원 수소연료전지연구) ;
  • 김영호 (충남대학교 응용화학공학과)
  • 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)
  • 투고 : 2017.10.16
  • 심사 : 2017.11.20
  • 발행 : 2018.02.10
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초록

황-요오드(SI) 공정의 통합 운전을 위한 분젠 반응 단계에서, $I_2$ 및 $H_2O$ 반응물들은 $HI_x$ 용액 내 용해된 성분들로써 공급된다. $HI_x$ 용액과 $SO_2$ 공급을 이용하여 분젠 반응이 수행될 때 $HI_x$ 상 내 대부분의 $H_2SO_4$ 생성물이 존재하며, 이에 따라 $HI_x$ 상에 대한 $H_2SO_4$ 상의 부피 비가 매우 낮다. 본 연구에서 우리는 상 분리 성능을 향상시키기 위해 $HI_x$ 용액을 이용한 분젠 반응에 대한 초음파 조사의 효과들을 연구하였다. 분젠 반응과 함께 초음파가 조사될 때 $HI_x$ 상으로부터 $H_2SO_4$ 상으로 이동된 $H_2SO_4$의 양은 최대 58.0 mol%까지 증가하였으며, $H_2SO_4$ 상의 부피 또한 최대 13.1 vol%까지 증가하였다. 특히, 상 분리에 대한 초음파 조사의 효과는 온도, $I_2$ 및 $H_2O$ 공급 농도가 감소함에 따라 향상되었다. 초음파 조사는 $HI_x$ 상 내 반응 평형을 미시적으로 이동시킴으로써 추가적인 $H_2O$ 분자들의 형성을 유도하였다. 이로부터 추가적으로 생성된 $H_2O$ 및 분리된 $H_2SO_4$ 분자들이 $H_2SO_4$ 상으로 이동할 수 있는 더 많은 $H_2SO_4{\cdot}xH_2O$ (x = 5-6) 착물들을 형성하였다.

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.

키워드

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