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Evaluation of tri-n-octylamine oxide as phenol extractant in a solvent impregnated resin

机译:溶剂浸渍树脂中三正辛基氧化胺作为酚提取剂的评价

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摘要

Tri-n-ocytlamine oxide (TOAO) is evaluated as alternative to the state-of-the-art phenol extractants tri-n-octylphosphine oxide (TOPO) and Cyanex 923. Liquid-liquid equilibrium experiments show that TOAO in 1,3-dimethylnaphthalene achieves higher phenol distribution coefficients in an extractant concentration range of 0.1 -1.25 mol L~(-1) than respective TOPO/1,3-dimethylnaphthalene or Cyanex 923/1,3-dimethylnaphthalene solutions. In a solvent impregnated resin (SIR) application, the SIRs impregnated with TOAO/1,3-dimethylnaphthalene have a higher phenol capacity than the SIRs impregnated with Cyanex 923/1,3-dimethylnaphthalene. Regeneration of the SIRs with alkaline solution of pH 13 shows that both SIRs maintain a constant phenol capacity during at least seven cycles. Based on these observations TOAO can be considered as a better alternative to Cyanex 923.
机译:评估了三正辛基胺氧化物(TOAO)替代最新的酚提取剂三正辛基膦氧化物(TOPO)和Cyanex923。液-液平衡实验表明,TOAO在1,3-在萃取剂浓度范围为0.1 -1.25 mol L〜(-1)时,二甲基萘比相应的TOPO / 1,3-二甲基萘或Cyanex 923 / 1,3-二甲基萘溶液具有更高的苯酚分配系数。在溶剂浸渍树脂(SIR)的应用中,用TOAO / 1,3-二甲基萘浸渍的SIR比用Cyanex 923 / 1,3-二甲基萘浸渍的SIR具有更高的苯酚容量。用pH 13的碱性溶液再生SIR显示,两个SIR在至少七个循环中均保持恒定的苯酚容量。基于这些观察,可以认为TOAO是Cyanex 923的更好替代方案。

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