US3932274A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for eliminating metals from a solution containing a very slight amount of the metals
Assignee: National Institute of Advanced Industrial Science and Technology
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Filing: 1974-06-11
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Granted: 1976-01-13
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Expires: 1994-06-11
Abstract
Abstract Metal ions are effectively eliminated from aqueous solutions containing theame by treating the solution with a metal sequestering agent which is a condensation product of a higher alkyl halide with a polyamine.
Inventors
- 👤 Gaku Izumi
- 👤 Tetsuo Kimura
- 👤 Katsuyoshi Mori
- 👤 Michiko Koizumi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:05
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/28; C02F1/285; C02F1/52; C02F1/5272; C02F1/68; C02F1/683; C02F5/00; C02F5/08; C02F5/10
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
149 words
A method for eliminating heavy metal ions from a solution containing a minute amount of heavy metal ions comprising treating said solution with a metal sequestering agent consisting essentially of a higher alkylated polyamine of the general formula: ##EQU2## wherein: R 1 is an alkyl, hydroxyalkyl, or alkoxyalkyl group having about 8-24 carbon atoms, R 2 is a hydrogen atom, the same as R 1 , or a -- (CH 2 ) X --N(R 3 )--R 4 group, R 3 and R 4 each are a hydrogen atom or the same as R 1 ' x is an integer from 1 to 4 and y is an integer from 1 to 3, or a water-soluble addition salt of said polyamine with an organic or inorganic acid; blowing air into the treated solution to form bubbles and separating the metal sequestering agent from the solution through adsorption of said bubbles.
Claim 2
Independent Claim
149 words
A method for eliminating heavy metal ions from a solution containing a minute amount of heavy metal ions comprising treating said solution with a metal sequestering agent consisting essentially of a higher alkylated polyamine of the general formula: ##EQU2## wherein: R 1 is an alkyl, hydroxyalkyl, or alkoxyalkyl group having about 8-24 carbon atoms, R 2 is a hydrogen atom, the same as R 1 , or a -- (CH 2 ) X --N(R 3 )--R 4 group, R 3 and R 4 each are a hydrogen atom or the same as R 1 ' x is an integer from 1 to 4 and y is an integer from 1 to 3, or a water-soluble addition salt of said polyamine with an organic or inorganic acid; blowing air into the treated solution to form bubbles and separating the metal sequestering agent from the solution through adsorption of said bubbles.
Claim 3
Dependent Claim
23 words
The method of claim 1 wherein said condensation product is an alkyl-, alkoxyalkyl-, or hydroxyalkyl-substituted polyamine, said substituent having about 8-24 carbon atoms.
Claim 4
Dependent Claim
16 words
The method of claim 1 wherein said polyamine is a polymethylene diamine or a polyalkylene polyamine.
Claim 5
Dependent Claim
37 words
The method of claim 1 wherein said solution is treated with said agent in an amount equal to at least about 2 moles of such polyamine for each atomic weight of the metallic ions to be removed.
References Cited (Backward Citations)
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US2712544A
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US3054746A
Cited
US3116105A
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US3238127A
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US3363758A
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US3459649A
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US3506576A
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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) | 1979-01-12 | 1979-07-14 | 1980-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-12 | 1983-07-14 | 1984-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-12 | 1987-07-14 | 1988-01-13 | $7700.00 | Window Closed / Lapsed |