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公开(公告)号：US5258167A
公开(公告)日：1993-11-02
申请号：US708363
申请日：1991-05-31
CPC分类号： C22B3/0068 , C01F17/0006 , C22B59/00 , Y02P10/234 , Y10S423/14
摘要： An extractant for extracting rare earth metal ions comprises, for instance, di-(3-methylcyclohexyl)phosphoric acid, di-1-ethylpentylphosphoric acid, docosyl-(2 isopropyl-5-methylcyclohexyl) phosphoric acid, 2-ethylhexyl-2-methylcyclohexylphosphoric acid and/or 2-hexyloctyl-cyclohexylphosphoric acid or a combination of, for instance, dicyclohexylphosphoric acid and di-(2-heptylundecyl) phosphoric acid. A method for extracting rare earth metals comprises the step of bringing an acidic aqueous solution containing ions of rare earth metals into contact with an extraction medium containing an extractant exemplified above to transfer the rare earth metal ions to the extraction medium. The extractant not only exhibits high extractability for rare earth metal ions but also facilitates the back extraction of the rare earth metal ions therefrom. In particular, the extractant has a great difference between the extractabilities for light rare earth metals which are abundantly present in the crust of the earth and for medium and heavy rare earth metals and has an excellent power for mutual separation of these rare earth metals. Thus, the rare earth metal ions can be extracted and separated in high efficiency.
摘要翻译： 用于提取稀土金属离子的萃取剂包括例如二 - （3-甲基环己基）磷酸，二-1-乙基戊基磷酸，二十二烷基 - （2异丙基-5-甲基环己基）磷酸，2-乙基己基-2-甲基环己基磷酸 酸和/或2-己炔基 - 环己基磷酸或二环己基磷酸和二 - （2-庚基十一烷基）磷酸的组合。 稀土金属的提取方法包括使含有稀土金属离子的酸性水溶液与含有上述例举的萃取剂的萃取介质接触的步骤，将稀土金属离子转移到萃取介质中。 萃取剂不仅对稀土金属离子表现出很高的萃取能力，而且有利于从中提取稀土金属离子。 特别地，萃取剂在地壳中大量存在的稀土金属和中，重稀土金属的萃取率差异较大，并且具有优异的这些稀土金属相互分离的能力。 因此，可以高效地提取和分离稀土金属离子。
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2.发明授权Agent containing an ellagic acid series compound for external application and use thereof 失效含有ELLAGIC酸系列化合物的外用剂及其用途
公开(公告)号：US5073545A
公开(公告)日：1991-12-17
申请号：US202321
申请日：1988-06-06
IPC分类号： A61K8/00 , A61K8/49 , A61K8/60 , A61K8/73 , A61K31/35 , A61K36/61 , A61Q19/00 , A61Q19/02 , A61Q19/10 , C07D493/04 , C07H17/04
摘要： Agents for external application contain as an effective component ellagic acid series compounds represented by the general formula [I] or salts thereof: ##STR1## wherein R.sub.1 to R.sub.4 are a hydrogen atom, an alkyl group having 1 to 20 carbon atoms, an alkoxy group having 1 to 20 carbon atoms, a polyalkylene oxide residue where the alkylene oxide unit has 2 to 3 carbon atoms, or a sugar residue represented by the formula [II]: ##STR2## and R.sub.5 is a hydrogen atom, a hydroxyl group or an alkoxy group having 1 to 8 carbon atoms.
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