二己基吡咯烷基二甘醇酰胺对硝酸介质中三价稀土的萃取行为  

Extraction behavior of trivalent rare earth from nitric acid medium by pyrrolidinyl diglycolamide

作　　者：王奕文 弓爱君[1,2] 邱丽娜[1,2] 白玉臻 刘杨 高歌[1,2] 赵伟宇 WANG Yiwen;GONG Aijun;QIU Lina;BAI Yuzhen;LIU Yang;GAO Ge;ZHAO Weiyu(College of Chemistry and Biological Engineering,University of Science and Technology Beijing,Beijing 100083,China;Beijing Key Laboratory for Science and Application of Functional Molecular and Crystalline Materials,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]北京科技大学化学与生物工程学院,北京100083 [2]北京科技大学功能分子与晶态材料科学与应用北京市重点实验室,北京100083

出　　处：《分析试验室》2024年第11期1550-1555,共6页Chinese Journal of Analysis Laboratory

基　　金：国家重点研发计划(2017YFF0106006);北京市自然科学基金(8172033)资助。

摘　　要：以吡咯烷基二甘醇酰胺(PYRDGA)为萃取剂,以二氯甲烷为稀释剂,从硝酸溶液中萃取三价稀土元素(REE(Ⅲ)),考察了萃取剂浓度、硝酸浓度、水相酸度和温度对分配比的影响。结果表明,在实验条件下,PYRDGA对REE(Ⅲ)的萃取分配比呈现出随原子序数的增加而增加的趋势。该萃取剂表现出较高的分配比(1217~4683),在轻稀土之间的分离系数较高,是性能优良的稀土萃取剂,可用于REE(Ⅲ)的萃取。计算了298.15 K下萃取反应的焓变、熵变和吉布斯能,表明PYRDGA对REE(Ⅲ)的萃取为自发的放热反应。通过热化学方法确定了REE(Ⅲ)∶PYRDGA∶■在萃取体系中的比例为1∶3∶2。Pyrrolidinyl diglycolamide (PYRDGA) was used as the extractant to extract trivalent rare earths REE(Ⅲ) from nitric acid solution,and the effects of extractant concentration,nitric acid concentration,aqueous phase acidity and temperature on the partition ratio were investigated.PYRDGA showed a trend that the extraction partition ratio of REE(Ⅲ) increased with the increase of atomic number.The extractant exhibited a high partition ratio ranging from 1217 to 4683 and is an excellent performance rare earth extractant.The enthalpy change,entropy change and Gibbs energy of the extraction reaction at 298.15 K were calculated and it was shown that the extraction of REE(Ⅲ) by PYRDGA is a spontaneous and exothermic reaction.The ratio of REE(Ⅲ)∶PYRDGA∶■ in the extraction system was determined to be 1∶3∶2 by thermochemical methods.

关 键 词：酰胺荚醚萃取剂 液液萃取 三价稀土元素 

分 类 号：O657.31[理学—分析化学] X832[理学—化学]