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为深入认识可逆络合萃取的机理 ,以丙酸为被萃溶质 ,三烷基胺 (Alam ine336 )、三烷基氧磷和磷酸三丁酯为萃取剂 ,分别以正辛醇、异辛醇和正己烷为稀释剂 ,开展了萃取平衡特性的实验研究。结果表明 ,萃取剂对丙酸萃取分配系数 (D)的影响与稀释剂种类有关 ,Alam ine336在辛醇溶液中存在协萃效应 ,D值随萃取剂浓度的升高先增大后减小 ;而磷氧类萃取剂的 D值随萃取剂浓度的升高而增大 ,且TRPO比 TBP萃取丙酸的能力强。因辛醇与磷氧类萃取剂之间的氢键作用 ,在萃取剂的化学计量饱和前 ,正己烷为稀释剂的萃取效果更佳。根据稀释剂类型建立的基于界面反应和有机相反应的描述萃取平衡的数学模型 ,可以较好地预测萃取平衡特性 ,计算精度令人满意
In order to understand the mechanism of reversible complexation extraction, propionic acid was used as extraction solvent, Alam ine336, trialkylphosphine and tributyl phosphate were used as extractants, and n-octanol, isooctanol and N-hexane as a diluent, carried out an experimental study of the extraction equilibrium characteristics. The results showed that the effect of extractant on the partition coefficient (D) of propionic acid was related to the type of diluent. Alam ine336 showed synergistic effect in octanol solution. The value of D increased first and then decreased with the increase of extractant concentration. The D value of oxygen extractant increases with the increase of extractant concentration, and TRPO is more capable of extracting propionic acid than TBP. Due to the hydrogen bond between octanol and phosphorus-oxygen extractant, n-hexane is more effective as a diluent before the stoichiometric saturation of the extractant. According to the type of diluent established based on the interfacial reaction and the organic phase of the reaction equilibrium description of the extraction of mathematical models can better predict the extraction equilibrium characteristics, the calculation accuracy is satisfactory