US4133755A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Agent for removing heavy metals
Assignee: JNC Corp
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Filing: 1977-07-25
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Granted: 1979-01-09
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Expires: 1997-07-25
Abstract
Abstract As an agent for removing heavy metals such as mercury from waste waters containing the same, a composition and granule based on the composition are provided. Also a method for preparing the granule is provided. The composition consists mainly of a dithiocarbamate bond-containing low molecular weight compound, amorphous silica and active carbon powder. The granule consists mainly of said composition and a vinyl acetate polymer resin as a binder. The method is carried out by kneading and extruding the composition of the granule together with a clay as an excipient. Treated water through said agent can pass the current very severe effluent standards.
Inventors
- 👤 Ryohkichi Tarao
- 👤 Kanji Kaku
- 👤 Masaki Hayashi
- 👤 Takao Nakamura
- 👤 Shigeo Ohishi
- 👤 Hajime Yamano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:18
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/22; C; C02; C02F; C02F1/00; C02F1/28; C02F1/288
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
136 words
An agent for removing mercury from waste waters containing the same, which consists essentially of (a) a compound which is characterized by the general formula: ##STR7## wherein R 1 , R 2 , R 3 , and R 4 are each either a hydrogen atom or an alkyl having 1 - 3 carbon atoms, and (R 1 and R 2 ) and (R 3 and R 4 ) can form a ring together with the terminal nitrogen atom, respectively, and x is an integer of 1 - 4, (b) amorphous silica and (c) active carbon powder, the ratio by weight of said compound to said amorphous silica being in the range of 20:1 - 1:2, and the ratio by weight of said compound to said active carbon powder being in the range of 10:1 - 1:10.
Claim 2
Dependent Claim
136 words
An agent for removing mercury from waste waters containing the same, which consists essentially of (a) a compound which is characterized by the general formula: ##STR7## wherein R 1 , R 2 , R 3 , and R 4 are each either a hydrogen atom or an alkyl having 1 - 3 carbon atoms, and (R 1 and R 2 ) and (R 3 and R 4 ) can form a ring together with the terminal nitrogen atom, respectively, and x is an integer of 1 - 4, (b) amorphous silica and (c) active carbon powder, the ratio by weight of said compound to said amorphous silica being in the range of 20:1 - 1:2, and the ratio by weight of said compound to said active carbon powder being in the range of 10:1 - 1:10.
Claim 3
Dependent Claim
10 words
An agent according to claim 1 wherein (a) is bisdimethyl-thio-carbamoyl-monosulfide.
Claim 4
Dependent Claim
11 words
An agent according to claim 1 wherein (a) is bisdiethyl -thio-carbamoyl-disulfide.
Claim 5
Dependent Claim
10 words
An agent according to claim 1 wherein (a) is bispentamethylene-thio-carbamoyl-tetrasulfide.
Claim 6
Dependent Claim
10 words
An agent according to claim 1 wherein (a) is bisdimethyl-thio-carbamoyl-disulfide.
Claim 7
Dependent Claim
165 words
A granular agent for removing mercury from waste waters containing the same, which consists essentially of (a) a compound characterized by the general formula: ##STR8## wherein R 1 , R 2 , R 3 and R 4 are each either a hydrogen atom or an alkyl having 1 - 3 carbon atoms, and (R 1 and R 2 ) and (R 3 and R 4 ) can form a ring together with the terminal nitrogen atom, respectively, and x is an integer of 1 -4, (b) amorphous silica, (c) active carbon powder, and (d) a binder composed of a vinyl acetate polymer resin, the ratio by weight of said compound to said active carbon powder being in the range of 10:1 - 1:10, the ratio by weight of said compound to said amorphous silica being in the range of 20:1 - 1:2, and the content of said vinyl acetate polymer resin in the granular agent being in the range of 5 - 70% by weight.
Claim 8
Dependent Claim
165 words
A granular agent for removing mercury from waste waters containing the same, which consists essentially of (a) a compound characterized by the general formula: ##STR8## wherein R 1 , R 2 , R 3 and R 4 are each either a hydrogen atom or an alkyl having 1 - 3 carbon atoms, and (R 1 and R 2 ) and (R 3 and R 4 ) can form a ring together with the terminal nitrogen atom, respectively, and x is an integer of 1 -4, (b) amorphous silica, (c) active carbon powder, and (d) a binder composed of a vinyl acetate polymer resin, the ratio by weight of said compound to said active carbon powder being in the range of 10:1 - 1:10, the ratio by weight of said compound to said amorphous silica being in the range of 20:1 - 1:2, and the content of said vinyl acetate polymer resin in the granular agent being in the range of 5 - 70% by weight.
Claim 9
Dependent Claim
10 words
An agent according to claim 6 wherein (a) is bisdimethyl-thio-carbamoyl-monosulfide.
Claim 10
Dependent Claim
10 words
An agent according to claim 6 wherein (a) is bisdiethyl-thio-carbamoyl-disulfide.
Claim 11
Dependent Claim
10 words
An agent according to claim 6 wherein (a) is bispentamethylene-thio-carbamoyl-tetrasulfide.
Claim 12
Dependent Claim
10 words
An agent according to claim 6 wherein (a) is bisdimethyl-thio-carbamoyl-disulfide.
Claim 13
Independent Claim
187 words
A method for producing a granular agent for removing mercury which comprises kneading a composition consisting essentially of (a) a compound characterized by the general formula: ##STR9## wherein R 1 , R 2 , R 3 and R 4 are each either a hydrogen atom or an alkyl having 1 - 3 carbon atoms, and (R 1 and R 2 ) and (R 3 and R 4 ) can form a ring together with the terminal nitrogen atom, respectively, and x is an integer of 1 - 4, (b) amorphous silica, (c) active carbon powder, and (d) an excipient comprising clay and a binder consisting essentially of a vinyl acetate polymer resin, to thereby obtain a blend having a water content of 25 - 35% by weight, and extruding the blend into granules, the content of said vinyl acetate polymer resin in said blend being in the range of 5% - 40% by weight (based on the % by weight of dried blend) and the ratio by weight of the total of (a), (b) and (c) to said excipient being in the range of 1:6 - 6.2.
Claim 14
Independent Claim
187 words
A method for producing a granular agent for removing mercury which comprises kneading a composition consisting essentially of (a) a compound characterized by the general formula: ##STR9## wherein R 1 , R 2 , R 3 and R 4 are each either a hydrogen atom or an alkyl having 1 - 3 carbon atoms, and (R 1 and R 2 ) and (R 3 and R 4 ) can form a ring together with the terminal nitrogen atom, respectively, and x is an integer of 1 - 4, (b) amorphous silica, (c) active carbon powder, and (d) an excipient comprising clay and a binder consisting essentially of a vinyl acetate polymer resin, to thereby obtain a blend having a water content of 25 - 35% by weight, and extruding the blend into granules, the content of said vinyl acetate polymer resin in said blend being in the range of 5% - 40% by weight (based on the % by weight of dried blend) and the ratio by weight of the total of (a), (b) and (c) to said excipient being in the range of 1:6 - 6.2.
Claim 15
Dependent Claim
10 words
A method according to claim 11 wherein (a) is bisdimethyl-thio-carbamoyl-monosulfide.
Claim 16
Dependent Claim
10 words
A method according to claim 11 wherein (a) is bisdiethyl-thio-carbamoyl-disulfide.
Claim 17
Dependent Claim
10 words
A method according to claim 11 wherein (a) is bispentamethylene-thil-carbamoyl-tetrasulfide.
Claim 18
Dependent Claim
10 words
A method according to claim 11 wherein (a) is bisdimethyl-thio-carbamoyl-disulfide.
Claim 19
Dependent Claim
47 words
A method according to claim 11 wherein the ratio by weight of said compound to said amorphous silica is in the range of 20:1 - 1:2, and the ratio by weight of said compound to said active carbon powder is in the range of 10:1 - 1:10.
Claim 20
Dependent Claim
12 words
A method according to claim 11 wherein said excipient consists of clay.
Claim 21
Dependent Claim
27 words
A method according to claim 11 wherein said excipient consists of 10 parts by weight of a clay and 2 parts by weight or less of bentonite.
Claim 22
Dependent Claim
54 words
A method according to claim 11 wherein said extrusion into granules is carried out by means of a screw type discharge extrusion where between a die and a screw is fixed a scraper provided with several blades of reverse pitches to the screw and rotated in the same direction as that of the screw.
Claim 23
Dependent Claim
24 words
A method for removing mercury from a liquid solution which comprises contacting the liquid solution with the granular agent set forth in claim 6.
Claim 24
Dependent Claim
43 words
A method according to claim 20 wherein a column having said granular agent packed therein and a column having active carbon powder packed therein are connected in series and waste water is passed through to thereby remove mercury contained in the waste water.
References Cited (Backward Citations)
DE1961275A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-01-08 | 1982-07-10 | 1983-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-08 | 1986-07-10 | 1987-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-08 | 1990-07-10 | 1991-01-09 | $7700.00 | Window Closed / Lapsed |