【摘要】 <正> 等曾报导用α-溴代己酸的氯仿溶液对钐、钕、钆和镥的萃取,其萃取曲线与无取代基的比较向酸性区移动了约1个pH单位。Preston报导了α-溴癸酸的二甲苯溶液对一系列金属离子的萃取,认为所试验的8个稀土金属与α-溴癸酸形成了不溶性的金属络合物。我们曾报导用α-氯代脂肪酸萃取金属离子。本文研究己酸、辛酸、癸酸和月桂酸等的α-单氯代物在盐酸体系中对镧、钕、钐和钇的萃取行为,讨论了这些酸的结构对萃取的影响。更多还原

【Abstract】 The extraction of rare earths (La³⁺,Nd³⁺,Sm³⁺ and Y³⁺) by α-chloroaliphatic acids (C₆, C₈, C₁₀, C₁₂) has been studied. The same extraction order was found for all four acids: Sm³⁺>Nd³⁺>La³⁺>Y³⁺. The extraction curves of α-chloroaliphatic acids shifted to about 1pH Unit lower as compared to the non-substituted one. Therefore hydrolysis and emulsification can be avoided. Y³⁺ can be separated from other rare earths when pH is low. Both the extraction rower and separation factor （βLa/y） increased with the increase of the number of carbon in α-chloroaliphatic acids.更多还原