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二(2—乙基己基)磷酸(HDEHP,本文也以HA代表)是目前稀土分离的最有效的萃取剂。有关它对三价稀土元素的萃取反应原理已有报导。D.F Peppard等较早研究了盐酸体系的萃取。他们的实验表明,稀土的分配比与平衡有机相中HDEHP的浓度的三次方成正比,同水相中氢离子浓度的三次方成反比,并且认为在有机相形成了RE(DEHP)_3。
Di (2-ethylhexyl) phosphate (HDEHP, also referred to herein as HA) is the most effective extractant currently available for rare earth separation. It has been reported about the extraction reaction of trivalent rare earth elements. D. F Peppard et al. Studied the extraction of hydrochloric acid systems earlier. Their experiments showed that the distribution of rare earths is proportional to the third power of HDEHP concentration in the equilibrium organic phase and inversely proportional to the third power of hydrogen ion concentration in the aqueous phase and that RE (DEHP) 3 is believed to be formed in the organic phase.