DEVELOPMENT OF NEW SOLVENT EXTRACTION METHO BY USING A MIXED SOLVENT

本报告新开发了一种独特的溶剂萃取系统，该系统是基于在萃取过程中使用混合溶剂形成萃取剂的原理。根据本方法，金属离子可以不使用螯合萃取剂从水相萃取到有机相。因此，与传统的DDTC提取方法相比，本方法具有以下优点：(1)通过简单地改变溶剂的量，可以获得与高浓度萃取剂相同的效果；(2)制备时不需要精确测量萃取剂溶液的体积；(3)由于萃取剂是在使用前通过混合溶剂产生的，因此不需要对不稳定的萃取剂溶液进行保存。这项资助资助的研究取得的主要成果如下：(1)成功开发了水杨醛肟生成体系，并在第69届日本化学学会年会上详细介绍了实验结果；(2)证明了烷基二硫代氨基甲酸酯在伯胺-二硫化碳-醇三元混合溶剂体系中生成，烷基黄药在叔胺-二硫化碳-醇三元混合溶剂体系中生成。(3)发现邻苯二胺CHCL_3溶液与NO_2^-水溶液振荡生成1,2,3-苯并噻唑，水杨醛-乙二胺-氯仿混合溶剂中生成N，N'-二二酰基乙二胺。

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.