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公开(公告)号：US20210189519A1
公开(公告)日：2021-06-24
申请号：US17187834
申请日：2021-02-28
发明人： Nien-Hwa Linda Wang , Lei Ling
IPC分类号： C22B3/20 , B01D15/38 , B01D15/16 , B01D15/18 , B01D15/36 , B01D15/42 , C22B3/06 , C22B3/24 , C22B59/00 , G01N30/46
摘要： A method of producing substantially pure rare earth elements (REEs) from a mixture, including the steps of dissolving a mixture containing REEs in a strong acid to result in a dissolved mixture of metal ions, including that of REEs, capturing metal ions of REEs in a first set of chromatographic columns comprising strong acid cation exchange resins, washing said first set of chromatographic columns with a salt solution to remove non-adsorbing metal ions, eluting metal ions of REES from said first set of chromatographic columns with a first ligand solution to result in a solution of enriched metal ions of REEs, loading said solution of enriched metal ions of REEs onto a second set of chromatographic columns, and eluting bound metal ions of REEs stepwise from said second set of chromatographic columns using a second ligand solution to afford a substantially pure REE. The second set of chromatographic columns comprises hydrous polyvalent metal oxide selected from the group consisting of TiO2, ZrO2, or SnO2. The ligand of the second ligand solution coordinates with said hydrous polyvalent metal oxide.
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公开(公告)号：US20170166993A1
公开(公告)日：2017-06-15
申请号：US15327041
申请日：2015-07-17
发明人： Nien-Hwa Linda Wang , Lei Ling
CPC分类号： C22B3/0098 , B01D15/166 , B01D15/1871 , B01D15/362 , B01D15/3828 , B01D15/42 , C22B3/06 , C22B3/24 , C22B59/00 , Y02P10/234
摘要： Presented herein is a ligand-assisted elution chromatography process for the separation of metal ions using a sorbent. An inorganic sorbent, titania, for example, has three types of adsorption sites: Bronsted acid (BA), Bronsted base (BB), and Lewis acid (LA). At a high pH, the BA sites can interact with the metal ions as a cation exchanger. If a ligand with COO groups is preloaded onto the sorbent, the COO— groups of the ligand can adsorb onto the LA sites. The adsorbed. ligands become strong adsorption sites for the metal ions. If the Langmuir a value for metal ion adsorption is similar to that of metal ion complexation with the ligand in the mobile phase, the different metal ions can be eluted separately with an overall selectivity which is equal to the ratio of the ligand selectivity to the sorbent selectivity.
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公开(公告)号：US20200308668A1
公开(公告)日：2020-10-01
申请号：US16709973
申请日：2019-12-11
发明人： Nien-Hwa Linda Wang , Lei Ling
IPC分类号： C22B3/20 , B01D15/38 , B01D15/16 , B01D15/18 , B01D15/36 , B01D15/42 , C22B3/06 , C22B3/24 , C22B59/00 , G01N30/46
摘要： Presented herein is a ligand-assisted elution chromatography process for the separation of metal ions using a sorbent. In particular, the present invention discloses a process of two sets of column system in combination with two sets of eluting ligand solutions to prepare substantially pure rare earth elements, wherein the first set of column comprises strong acid cation exchange resins and the second set of chromatographic columns comprises hydrous polyvalent metal oxide selected from the group consisting of TiO2, ZrO2, or SnO2 and wherein ligand of said second ligand solution coordinates with said hydrous polyvalent metal oxide.
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公开(公告)号：US10597751B2
公开(公告)日：2020-03-24
申请号：US15327041
申请日：2015-07-17
发明人： Nien-Hwa Linda Wang , Lei Ling
IPC分类号： C22B3/20 , B01D15/38 , B01D15/16 , B01D15/18 , B01D15/36 , B01D15/42 , C22B3/24 , C22B59/00 , G01N30/46 , C22B3/06
摘要： Presented herein is a ligand-assisted elution chromatography process for the separation of metal ions using a sorbent. In particular, the present invention discloses a process of two sets of column system in combination with two sets of eluting ligand solutions to prepare substantially pure rare earth elements, wherein the first set of column comprises strong acid cation exchange resins and the second set of chromatographic columns comprises hydrous polyvalent metal oxide selected from the group consisting of TiO2, ZrO2, or SnO2 and wherein ligand of said second ligand solution coordinates with said hydrous polyvalent metal oxide.
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