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US4394353A
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Separation of rare earth metals using a cation exchanger
Assignee: Asahi Kasei Corp
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Filing: 1980-12-04
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Granted: 1983-07-19
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Expires: 2000-12-04
Abstract
Abstract A process for the separation of one rare earth metal from another in a mixture of rare earth metals by chromatographic displacement using a complexing agent and a cation exchanger, which process comprises using a cation exchanger having a micro-void volume void ratio of 0.5 to 0.95, preferably 0.5 to 0.88.
Inventors
- 👤 Tetsuya Miyake
- 👤 Kunihiko Takeda
- 👤 Hatsuki Onitsuka
- 👤 Kazuo Okuyama
- 👤 Yasuki Shimamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:44
CPC Classifications
B; B01; B01D; B01D15/00; B01D15/08; B01D15/42; B01D15/422; B01J; B01J39/00; B01J39/26; C; C01; C01F; C01F17/00; C01F17/10; C01F17/13; C22; C22B; C22B3/00; C22B3/20; C22B3/26; C22B3/32; C22B3/42; G; G01; G01N; G01N30/00; G01N30/02; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
196 words
In a process for the separation of one rare earth metal from another in a mixture of rare earth metals by passing a retaining agent solution through a bed of a cation exchanger to convert the cation exchanger into that of a retaining agent type, passing a solution of the mixture through the cation exchanger to form a rare earth metal adsorption zone on the bed of the cation exchanger, passing a complexing agent solution through the cation exchanger to effect migration of the rare earth metal adsorption zone through the bed of the cation exchanger and separating a fraction of one of the rare earth metals, the improvement which comprises using as the cation exchanger a cation exchanger having a micro-void volume ratio of 0.58 to 0.95 and a degree of crosslinking of 8 to 17 or having a micro-void volume ratio of 0.50 to 0.95 and a degree of crosslinking of 17 to 80 and passing the materials through the cation exchanger at a rate such that the migration velocity of the rare earth metal adsorption zone through the cation exchanger is from about 5 m per day to about 500 m per day.
Claim 2
Dependent Claim
196 words
In a process for the separation of one rare earth metal from another in a mixture of rare earth metals by passing a retaining agent solution through a bed of a cation exchanger to convert the cation exchanger into that of a retaining agent type, passing a solution of the mixture through the cation exchanger to form a rare earth metal adsorption zone on the bed of the cation exchanger, passing a complexing agent solution through the cation exchanger to effect migration of the rare earth metal adsorption zone through the bed of the cation exchanger and separating a fraction of one of the rare earth metals, the improvement which comprises using as the cation exchanger a cation exchanger having a micro-void volume ratio of 0.58 to 0.95 and a degree of crosslinking of 8 to 17 or having a micro-void volume ratio of 0.50 to 0.95 and a degree of crosslinking of 17 to 80 and passing the materials through the cation exchanger at a rate such that the migration velocity of the rare earth metal adsorption zone through the cation exchanger is from about 5 m per day to about 500 m per day.
Claim 3
Dependent Claim
27 words
The process of claim 1, wherein the cation exchanger has a micro-void volume ratio of 0.50 to 0.95 and a degree of crosslinking of 17 to 80.
Claim 4
Dependent Claim
18 words
The process of claim 2, wherein the cation exchanger has a micro-void volume ratio of 0.50 to 0.88.
Claim 5
Dependent Claim
18 words
The process of claim 2, wherein the cation exchanger has a micro-void volume ratio of 0.55 to 0.82.
Claim 6
Dependent Claim
75 words
The process of any one of claims 1, 2, 3, or 4 which comprising using hydrogen ion as the retaining agent, passing a solution containing at least about 0.01 M/l of hydrogen ion through the bed of the cation exchanger where the rare earth metal adsorption zone has already passed to convert the cation exchanger into that of a hydrogen ion type, and withdrawing the formed neutral salt from the bed of the cation exchanger.
Claim 7
Dependent Claim
47 words
The process of any one of claims 2, 3 or 4, wherein the cation exchanger is obtained by polymerization or co-polymerization of monomers having an ethylenically unsaturated group and containing at least 17% by weight of a crosslinkable monomer based on the total weight of the monomers.
Claim 8
Dependent Claim
67 words
The process of claim 6, comprising using hydrogen ion as the retaining agent, passing a solution containing at least about 0.01 M/l of hydrogen ion through the bed of the cation exchanger where the rare earth metal adsorption zone has already passed to convert the cation exchanger into that of a hydrogen ion type, and withdrawing the formed neutral salt from the bed of the cation exchanger.
Claim 9
Dependent Claim
177 words
In a process for the separation of one rare earth metal from another in a mixture of rare earth metals by passing a retaining agent solution through a bed of a cation exchanger to convert the cation exchanger into that of a retaining agent type, passing a solution of the mixture through the cation exchanger to form a rare earth metal adsorption zone on the bed of the cation exchanger, passing a complexing agent solution through the cation exchanger to effect migration of the rare earth metal adsorption zone through the bed of the cation exchanger and separating a fraction of one of the rare earth metals, the improvement which comprises using as the cation exchanger a cation exchanger having a micro-void volume ratio of 0.50 to 0.95 and a degree of crosslinking of 17 to 80 and passing the materials through the cation exchanger at a rate such that the migration velocity of the rare earth metal adsorption zone through the cation exchanger is from about 5 m per day to about 500 m per day.
Claim 10
Dependent Claim
177 words
In a process for the separation of one rare earth metal from another in a mixture of rare earth metals by passing a retaining agent solution through a bed of a cation exchanger to convert the cation exchanger into that of a retaining agent type, passing a solution of the mixture through the cation exchanger to form a rare earth metal adsorption zone on the bed of the cation exchanger, passing a complexing agent solution through the cation exchanger to effect migration of the rare earth metal adsorption zone through the bed of the cation exchanger and separating a fraction of one of the rare earth metals, the improvement which comprises using as the cation exchanger a cation exchanger having a micro-void volume ratio of 0.50 to 0.95 and a degree of crosslinking of 17 to 80 and passing the materials through the cation exchanger at a rate such that the migration velocity of the rare earth metal adsorption zone through the cation exchanger is from about 5 m per day to about 500 m per day.
Claim 11
Dependent Claim
18 words
The process of claim 8, wherein the cation exchanger has a micro-void volume ratio of 0.50 to 0.88.
Claim 12
Dependent Claim
18 words
The process of claim 9, wherein the cation exchanger has a micro-void volume ratio of 0.55 to 0.82.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-07-18 | 1987-01-17 | 1987-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-07-18 | 1991-01-17 | 1991-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-07-18 | 1995-01-17 | 1995-07-19 | $7700.00 | Window Closed / Lapsed |