HEH(EH)P对碱土金属离子萃取平衡的研究

来源期刊：中南大学学报(自然科学版)1987年第6期

论文作者：黄可龙 舒万艮 张祥麟

文章页码：687 - 692

关键词：溶剂萃取； 碱土金属； 萃取剂； 乙基已基膦酸乙基已基酯

Key words：solvent extraction； alkaline earth metal； extractive agent； ethylhexyl phosphonic acid monoethylhexyl ester

摘    要：本文采用两相滴定法测定了2-乙基已基膦酸2-乙基已基酯（简称HEH（EH）P）的某些基本常效.研究了用HEH（EH）P在煤油溶剂中萃取碱土金属Ca,Sr等的平衡.在有机相中,金属-萃取剂的萃合物组成分别是CaA₂·2HA和SrA₂·2HA它们的表观萃取常数分别为lgK_1·2^ca=-4.14,lgK_1·2^sr=-4.30.

Abstract: By using the two-phase titration method for 2-ethylhexyl phosphonic acid mono-2-ethylhexyl ester （=HEH（EH）P=HA） between kerosine and aqueous solution, the equilibrium constants of HEH（EH）P were determined. At 20±1℃, the extraction equilibrium of calcium and strontium between kerosine containing HEH（EH）P and aqueous solution of （Na,H）NO₃ were carried out in the low concentration range of the metal ions. The composition of the extracted complexes is CaA₂·2HA and SrA₂·2HA. The extraction equilibrium constants have been evaluated, i. e. lgK_1.2^C=-4.14, lgK_1.2^Sr=-4.30.