DEVELOPMENT OF NEW SOLVENT EXTRACTION METHO BY USING A MIXED SOLVENT

本文根据混合溶剂在萃取过程中形成萃取剂的原理，开发了一种独特的溶剂萃取体系。根据本发明的方法，金属离子可以从水相萃取到有机相，而根本不使用螯合萃取剂。然后，本方法的特征在于与传统DDTC提取方法相比具有以下优点：（1）能够通过简单地改变溶剂的量而获得与高浓度萃取剂相同的效果，（2）在制备时不必精确地测量萃取剂溶液的体积，和（3）不必采取保存不稳定萃取剂溶液的预防措施，因为提取剂是通过在使用前混合溶剂而制备的。这项补助金资助的研究取得的主要成果如下：（1）成功地开发了水杨醛肟形成体系，并在日本化学学会第69届年会上公布了实验结果的细节，（2）证明了伯胺-二硫化碳-醇三元混合溶剂体系中生成烷基二硫代氨基甲酸酯，叔胺-二硫化碳-醇三元混合溶剂体系中生成烷基黄原酸酯。（3）邻苯二胺CHCL_3溶液和NO_2 ~-水溶液振荡生成1，2，3-苯并三唑，在水杨醛-乙二胺-氯仿混合溶剂中生成N，N ′-二亚乙基乙二胺。

An unique solvent extraction system, which is based on the principle that extractant is formed by using the mixed solvent during the course of extraction, has been newly developed by the present reporter. According to the present method, metal ions can be extracted from aqueous phase to organic phase without using chelate extractant at all. Then, the present method is characterized by the following advantages over the conventional DDTC extraction method : (1)ability to obtain the same effect as that gained with the extractant in a high concentration by simply changing the amount of solvents, (2)it is not necessary to measure the extractant solution volume precisely on preparation, and(3)precautions for preserving the unstable extractant solution are unnecessary, since extractant is produced by mixing solvents prior to use. The main results obtained by the research supported by this Grant-in-Aid are as follows : (1)salicylaldoxime-forming system was successfully developed and the details of the experimental results were presented at the 69 th annual meeting of The Chemical Society of Japan, (2)it was proved that alkyldithiocarbamate is formed in the primary amine-carbon disulfide-alcohol ternary mixed solvent system and alkylxanthate in the tertiary amine-carbon disulfide-alcohol one, and(3)it was found that 1,2,3-benzotiazole is formed by shaking o-phenylendiamine CHCL_3 solution and NO_2^- aqueous solution and N,N'-disalicylidenethylendiamine is formed in the salicylaldehyde-ethylendiamine-chloroform mixed solvent.