By Ion Exchange Method To Remove The Synthetic Reaction Of Hydroxylamine Solution In Iron, Chromium Ions

The factors of the catalyst poising and the solutions being discharged have been studied in this article, which were caused by iron(Ⅱ), chromium(Ⅲ) ion in the solutions. The ion exchanging method to remove the iron(Ⅱ), chromiuni(Ⅲ) ion from the solutions has been applied in the process of synthesize hydroxylamine, and various adsorbents, the influence of different adsorption conditions, eluents , the desorption conditions have been investigated. Finally, we choosed the SL-406 chelation resin as the best adsorbent. The results showed that the best condition for adsorption was flow rate 1/10(v/v/min), and that the best condition for desorption iron( Ⅱ), chromium(Ⅲ) at the same time was flow rate l/10(v/v/min) by the l%EDTA+lmol/L HC1 solutions. The adsorption capacity of SL-406 resin was up to 1.8mmol/g. Elimination percent of iron( Ⅱ) ion was approximately 100%, and that of chromium(Ⅲ) ion was 70%.Spectrophotometries of iron(Ⅱ), chromium(Ⅲ) ion were also studied. Iron(Ⅱ) ion was determined by reacting with O-phenanthroline to form a colour complex (A max=510nm), which obeyed Beer's law in the range of 0~0.1mg/50ml. Its molar adsorption coefficient was 1.12 × 103 L ·mor-1·m-1 , its relative accuracy was 5%, and its recovery percent was between 98% and 103%. Chromium(III) ion was determined by reacting with H3PO4 to form a colour complex (A. max=660nm), which obeyed Beer's law in the range of 0~0.5mg/25ml. Its molar adsorption coefficient was 1.4 ×10 L·mol-1·cm4 , its relative accuracy was 5%, and its recovery percent was between 98% and 103%.The conclusion of the article has provided the important reference for removal of iron(Ⅱ), chromium( Ⅲ) ion from the reacting solutions of the synthesize of hydroxylamine in industry.