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Chemical degradation of an ion exchange resin processing salt solutions

机译：离子交换树脂加工盐溶液的化学降解

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This paper describes the results from an investigation into the chemical degradation of an organic ion exchange resin,SuperLig 644,over 25 repeated cycles separating cesium from an alkaline solution of sodium salts with subsequent elution.Battelle Pacific Northwest Division (PNWD) tested the resin with a salt solution simulating the radioactive wastes currently stored at Hanford,Washington,USA generated from plutonium production activities.Battelle PNWD used a simulated waste consisting predominantly of nitrate,nitrite and hydroxide salts of sodium for a sodium concentration of approx120g/L.We tested the resin in a column with a bed volume of approx10mL.Battelle PNWD linked probes positioned on the column feed and eTfluent lines to a spectrometer that analyzed for dissolved oxygen.A cycle test commenced with converting the resin to the sodium form by pumping 0.25 M sodium hydroxide solution through the bed.Battelle PNWD then processed the simulated waste followed by column rinses with 0.1 M sodium hydroxide solution and de-ionized water.We then eluted the resin with 0.5 M nitric acid solution and the cycle finished with a de-ionized water rinse.The resin bed lost 34% of its mass over the 25 cycles of operation.Some resin appeared to dissolve in the 0.25 M sodium hydroxide regeneration solution since we observed the regeneration effluents of every cycle to be colored deep red-brown.Some regeneration effluents also contained resin fines that settled after approx1 day.In addition,examination of the resin showed the used resin to have apparently higher porosity than the fresh material.The resin appeared to lose approximately 60% of its effective capacity for cesium over the course of the 25 cycles.However,approx34% of the resin mass was also lost over this period.Battelle PNWD hypothesizes the difference of 26% to represent a loss in capacity and is presumably due to chemical alteration of the ion exchange sites.In addition,though the weight of resin decreased with each cycle,Battelle PNWD used the same volume of eluant to elute the resin in each cycle,indicating a reduction in elution efficiency.Battelle PNWD assumed resin oxidation to be the major degradation mechanism since oxygen dissolved in the feedstock was consumed upon processing.
机译：本文描述了对有机离子交换树脂SuperLig644的化学降解的研究结果，该过程经过25次重复循环将铯与钠盐的碱性溶液分离，随后进行洗脱.Battelle Pacific Northwest Division（PNWD）用盐溶液模拟了stored储存活动中目前在美国华盛顿汉福德存储的放射性废物.Batelle PNWD使用的模拟废物主要是钠的硝酸盐，亚硝酸盐和氢氧化盐，钠浓度约为120g / L。树脂在柱床中的柱床体积约为10mL.Batelle PNWD将位于色谱柱进料口和eTfluent管线上的探针连接到分析溶解氧的光谱仪上。开始循环试验，方法是通过泵入0.25 M氢氧化钠将树脂转化为钠形式然后，Battelle PNWD处理模拟废物，然后用0.1 M氢氧化钠溶液和去离子水，然后用0.5 M硝酸溶液洗脱树脂，并用去离子水冲洗完成循环。在25个操作循环中，树脂床的质量损失了34％。因为我们观察到每个循环的再生流出物都被染成深红褐色，所以一些树脂似乎溶解在0.25 M氢氧化钠再生溶液中。一些再生流出物还包含约1天后沉降的树脂细粉。结果表明用过的树脂的孔隙率明显高于新鲜材料。在25个循环过程中，树脂似乎失去了其有效的铯容量约60％，但是在此期间，约有34％的树脂质量损失了batelle PNWD假设差异为26％，代表容量损失，可能是由于离子交换位点的化学变化所致。在一个循环中，Battelle PNWD在每个循环中使用相同体积的洗脱液洗脱树脂，表明洗脱效率降低。BatellePNWD认为树脂氧化是主要的降解机理，因为原料中溶解的氧气在加工过程中被消耗掉了。

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