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Studies on the Development of Iodine Recovery Process with High Yield and Purity from NH4I Solution

NH4I 용액으로부터 고효율/고순도의 요오드 회수 공정개발에 관한 연구

  • Yoon, Jong Sun (Department of Chemical & Biomolecular Engineering, Sogang University) ;
  • Lim, Seong Bin (Department of Chemical & Biomolecular Engineering, Sogang University) ;
  • Oh, Se Yong (Department of Chemical & Biomolecular Engineering, Sogang University)
  • 윤종선 (서강대학교 화공생명공학과) ;
  • 임성빈 (서강대학교 화공생명공학과) ;
  • 오세용 (서강대학교 화공생명공학과)
  • Received : 2015.03.20
  • Accepted : 2015.04.02
  • Published : 2015.06.10

Abstract

In this paper, we have investigated the optimization of $I_2$ recovery process from $NH_4I$ solution, which is generated as by-product during the amination reaction of p-diiodobenzene (PDIB) for p-phenylenediamine (PPD) synthesis. The recovered $I_2$ is then recycled as a raw material for PDIB synthesis. We have employed a cation exchange resin to recover $I_2$ from $NH_4I$ sample solution, and determined the breakthrough point and exchange capacity from the breakthrough curve. Furthermore, we have suggested optimum conditions of our $I_2$ recovery process by measuring the purity and yield of recovered $I_2$ with respect to the concentrations of $NH_4I$ and oxidant ($H_2O_2$) solutions, the oxidation time, and the temperature of drying process. Finally, the yield and purity as high as 94.96% and 96.65%, respectively were obtained by reusing the residual solution still containing unrecovered iodide ions.

Keywords

iodine recovery process;cation exchange resin;ammonium iodide;PPD;PDIB

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