论文部分内容阅读
本文研究低浓度伯胺从低浓度含钨水溶液中按照溶剂化历程萃钨的规律。发现伯胺从含钨浓度高或低的水溶液溶剂化萃取的机理不同,过去的工作表明从高浓度钨水溶液萃入有机相的是H_2WO_4,本工作表明从低浓度水相萃入有机相的是其它钨的络合物,初步认为是WO_2(OH)_2,并且在萃取过程中,首先形成亲水性的水合络合物,然后脱水而进入有机相。实验表明水合络合物的形成能力是随水相支持电解质浓度的增大而降低,讨论了测得的有关的红外和紫外光谱。研究了叔胺萃钨的特点,认为叔胺与伯胺及仲胺一样,也可按溶剂化历程萃钨,由于叔胺不含活性氢原子,因此它的溶剂化能力要较伯胺和仲胺弱,从而需要大量的过量叔胺,才能得到较高的萃取率。
In this paper, we study the law of extracting tungsten from low concentration of primary amine in low concentration tungsten aqueous solution according to the solvation history. It has been found that the mechanism of solvothermal extraction of primary amines from aqueous solutions with high or low tungsten concentrations is different. Previous work showed that H 2 WO 4 was extracted into the organic phase from a high concentration aqueous solution of tungsten. This work showed that the extraction from the low concentration water phase into the organic phase was Other tungsten complexes, initially thought to be WO 2 (OH) _2, and in the extraction process, the first hydrophilic hydrate complexes formed, and then dehydrated into the organic phase. Experiments show that the formation ability of hydrate complexes decreases with the increase of support electrolyte concentration in water phase. The related infrared and ultraviolet spectra measured are discussed. Tertiary amine extraction of tungsten was studied. It is believed that tertiary amines, like primary amines and secondary amines, can also extract tungsten by solvation process. Since tertiary amines do not contain active hydrogen atoms, their ability to solvate is higher than that of primary amines and secondary amines Amine weak, which requires a large excess of tertiary amines, in order to get a higher extraction rate.