Studies on the development of iodine recovery process with high yield and purity from NH4I solution

초록

In this paper, we have investigated the optimization of I<inf>2</inf> recovery process from NH<inf>4</inf>I solution, which is generated as by-product during the amination reaction of p-diiodobenzene (PDIB) for p-phenylenediamine (PPD) synthesis. The recovered I2 is then recycled as a raw material for PDIB synthesis. We have employed a cation exchange resin to recover I<inf>2</inf> from NH<inf>4</inf>I sample solution, and determined the breakthrough point and exchange capacity from the breakthrough curve. Furthermore, we have suggested optimum conditions of our I<inf>2</inf> recovery process by measuring the purity and yield of recovered I2 with respect to the concentrations of NH<inf>4</inf>I and oxidant (H<inf>2</inf>O<inf>2</inf>) 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. © 2015, Korean Society of Industrial Engineering Chemistry. All right reserved.

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