US4039446A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heavy metal-binding agent process
Assignee: Sumitomo Chemical Co Ltd
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Filing: 1975-02-03
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Granted: 1977-08-02
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Expires: 1995-02-03
Abstract
Abstract A novel heavy metal-binding agent is obtained by reacting a resin containing in its molecular chain -NH-, -NH2, or both thereof with carbon disulfide and, if necessary, treating the reaction product thus obtained with a base. As compared with conventionally known metal-binding agents, the present metal-binding agent can remove heavy metals more effectively from solutions or gases containing these metals even in a range of extremely low concentrations, and, hence, is useful for pollution control.
Inventors
- 👤 Kouichi Ban
- 👤 Yasumiti Namba
- 👤 Yukihiro Sekine
- 👤 Masaaki Matsuda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:44
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/22; C; C02; C02F; C02F1/00; C02F1/52; C02F1/5272; C08; C08G; C08G18/00; C08G18/06; C08G18/83; C08G18/838; C08G69/00; C08G69/48; C08G73/00; C08G73/06; C08G73/08; C08G85/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
132 words
A method for removing heavy metals present in a solution or gas comprising contacting the heavy metal-containing solution or gas with a heavy metal-binding agent consisting essentially of the reaction product of at least 0.01% by weight of carbon disulfide with a resin selected from the group consisting of a urea resin, a thiourea resin, a melamine resin, an aniline resin, a urethane resin, and a resin obtained by reacting an amino compound with a halogen containing resin selected from the group consisting of polyvinyl chloride, polyvinylidene chloride, polyvinyl bromide, polyvinylidene bromide, 1-chloro-1-bromoethylene polymer, 1-chloro-1-fluoroethylene polymer, chlorinated polyethylene, chlorinated polypropylene and a copolymer of vinyl chloride, vinylidene chloride, vinyl bromide, vinylidene bromide, 1-chloro-1-bromoethylene or 1-chloro-1-fluoroethylene with acrylonitrile, vinyl acetate, acrylic acid, methacrylic acid, methyl methacrylate, methyl acrylate, ethyl acrylate or butyl acrylate.
Claim 2
Independent Claim
132 words
A method for removing heavy metals present in a solution or gas comprising contacting the heavy metal-containing solution or gas with a heavy metal-binding agent consisting essentially of the reaction product of at least 0.01% by weight of carbon disulfide with a resin selected from the group consisting of a urea resin, a thiourea resin, a melamine resin, an aniline resin, a urethane resin, and a resin obtained by reacting an amino compound with a halogen containing resin selected from the group consisting of polyvinyl chloride, polyvinylidene chloride, polyvinyl bromide, polyvinylidene bromide, 1-chloro-1-bromoethylene polymer, 1-chloro-1-fluoroethylene polymer, chlorinated polyethylene, chlorinated polypropylene and a copolymer of vinyl chloride, vinylidene chloride, vinyl bromide, vinylidene bromide, 1-chloro-1-bromoethylene or 1-chloro-1-fluoroethylene with acrylonitrile, vinyl acetate, acrylic acid, methacrylic acid, methyl methacrylate, methyl acrylate, ethyl acrylate or butyl acrylate.
Claim 3
Dependent Claim
16 words
A method according to claim 1, wherein the reaction product is further reacted with a base.
Claim 4
Dependent Claim
25 words
A method according to claim 1, wherein the heavy metal is selected from the group consisting of mercury, lead, chromium, cadmium, arsenic, copper and iron.
Claim 5
Dependent Claim
21 words
A method according to claim 1, wherein the heavy metal-binding agent is in the form of a powder or shaped article.
References Cited (Backward Citations)
US3340326A
Cited
US3755161A
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US3847841A
Cited
US3892689A
Cited
US3892688A
Cited
US3884846A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-01 | 1981-01-31 | 1981-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-01 | 1985-01-31 | 1985-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-01 | 1989-01-31 | 1989-08-02 | $7700.00 | Window Closed / Lapsed |