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http://dx.doi.org/10.14478/ace.2015.1040

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

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)
Publication Information
Applied Chemistry for Engineering / v.26, no.3, 2015 , pp. 377-380 More about this Journal
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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