US4219441A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aqueous alkali or alkaline treat and heat regeneration of NH4+ ad
Assignee: Hitachi Ltd
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Filing: 1977-11-29
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Granted: 1980-08-26
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Expires: 1997-11-29
Abstract
Abstract A method of regenerating zeolite by heating wherein zeolite having adsorbed (NH 3 -N) in foul water has sodium hydroxide added thereto, the sodium hydroxide containing Na + equivalent to NH 4 + adsorbed to the zeolite, water is added until the total quantity of the zeolite is submerged, and the resultant zeolite is heated at 400° C. for 30 minutes, whereby a regeneration rate of 90% is attained.
Inventors
- 👤 Yusaku Noshimura
- 👤 Yasuo Koseki
- 👤 Masayoshi Kubota
- 👤 Shoji Kubota
- 👤 Sankichi Takahashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:23
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/30; B01J20/34; B01J20/3408
Claims Analysis
Total Claims: 36
Claim 1
Independent Claim
114 words
A method of regenerating a mixture of zeolite having adsorbed NH 4 + ion and active carbon having adsorbed organic matter, comprising the steps of: submerging said mixture in an aqueous solution containing ions of at least one alkali metal thereby adding ions of said at least said one alkali metal to the mixture to make an aqueous mixture, wherein the mol ratio of said alkali ions to said NH 4 + ions is in the range of 1 to 1.5; and heating the aqueous mixture with the added ions to within the temperature range of 150° to 800° C. to release NH 3 gas and decompose the organic matter without decomposing the zeolite.
Claim 2
Independent Claim
114 words
A method of regenerating a mixture of zeolite having adsorbed NH 4 + ion and active carbon having adsorbed organic matter, comprising the steps of: submerging said mixture in an aqueous solution containing ions of at least one alkali metal thereby adding ions of said at least said one alkali metal to the mixture to make an aqueous mixture, wherein the mol ratio of said alkali ions to said NH 4 + ions is in the range of 1 to 1.5; and heating the aqueous mixture with the added ions to within the temperature range of 150° to 800° C. to release NH 3 gas and decompose the organic matter without decomposing the zeolite.
Claim 3
Dependent Claim
14 words
The method of claim 1, wherein said step of adding adds ions of sodium.
Claim 4
Dependent Claim
14 words
The method of claim 1, wherein said step of adding adds ions to potassium.
Claim 5
Dependent Claim
21 words
The method of claim 1, wherein said step of heating is carried out within the range of 400° to 800° C.
Claim 6
Dependent Claim
17 words
The method of claim 1, wherein said step of adding adds the ions as alkali metal hydroxides.
Claim 7
Dependent Claim
17 words
The method of claim 1, wherein said step of adding adds the ions as alkali metal carbonates.
Claim 8
Dependent Claim
17 words
The method of claim 1, wherein said step of adding adds the ions as alkali metal bicarbonates.
Claim 9
Dependent Claim
33 words
The method of claim 1, wherein said step of adding adds the ions as a solution of a sodium containing salt of a strong acid together with a sodium salt that exhibits alkalinity.
Claim 10
Dependent Claim
29 words
The method of claim 1, wherein said step of adding adds the ions as a solution of a sodium containing salt of a strong acid together with sodium hydroxide.
Claim 11
Independent Claim
117 words
A method of regenerating a mixture of zeolite having adsorbed NH 4 + ion and active carbon having adsorbed organic matter, comprisng the steps of: submerging said mixture in an aqueous solution containing ions of at least one alkaline earth metal thereby adding ions of said at least one alkaline earth metal to the mixture to make an aqueous mixture, wherein the mol ratio of said alkaline earth metal ions to said NH 4 + ions is in the range of 1 to 1.5, and heating the aqueous mixture with the added ions to within the temperature range of 150° to 800° C. to releast NH 3 gas and decompose the organic matter without decomposing the zeolite.
Claim 12
Independent Claim
117 words
A method of regenerating a mixture of zeolite having adsorbed NH 4 + ion and active carbon having adsorbed organic matter, comprisng the steps of: submerging said mixture in an aqueous solution containing ions of at least one alkaline earth metal thereby adding ions of said at least one alkaline earth metal to the mixture to make an aqueous mixture, wherein the mol ratio of said alkaline earth metal ions to said NH 4 + ions is in the range of 1 to 1.5, and heating the aqueous mixture with the added ions to within the temperature range of 150° to 800° C. to releast NH 3 gas and decompose the organic matter without decomposing the zeolite.
Claim 13
Dependent Claim
14 words
The method of claim 10, wherein said step of adding adds ions of magnesium.
Claim 14
Dependent Claim
14 words
The method of claim 10, wherein said step of adding adds ions of calcium.
Claim 15
Dependent Claim
21 words
The method of claim 10, wherein said step of heating is carried out within the range of 400°° to 800° C.
Claim 16
Dependent Claim
13 words
The method of claim 10, wherein said ions are alkaline earth metal hydroxides.
Claim 17
Dependent Claim
13 words
The method of claim 10, wherein said ions are alkaline earth metal carbonates.
Claim 18
Dependent Claim
13 words
The method of claim 10, wherein said ions are alkaline earth metal bicarbonates.
Claim 19
Independent Claim
97 words
A method of regenerating zeolite having adsorbed NH 4 + ions, comprising the steps of: submerging said zeolite in an aqueous solution containing ions of at least one alkali metal thereby adding ions of at least one alkali metal to the zeolite to make an aqueous mixture, wherein the mol ratio of said alkali ions to said NH 4 + ions is in the range of 1 to 1.5; and heating the aqueous mixture with the added ions to within the temperature range of 150° to 800° C. to release NH 3 gas without decomposing the zeolite.
Claim 20
Independent Claim
97 words
A method of regenerating zeolite having adsorbed NH 4 + ions, comprising the steps of: submerging said zeolite in an aqueous solution containing ions of at least one alkali metal thereby adding ions of at least one alkali metal to the zeolite to make an aqueous mixture, wherein the mol ratio of said alkali ions to said NH 4 + ions is in the range of 1 to 1.5; and heating the aqueous mixture with the added ions to within the temperature range of 150° to 800° C. to release NH 3 gas without decomposing the zeolite.
Claim 21
Dependent Claim
14 words
The method of claim 17, wherein said step of adding adds ions of sodium.
Claim 22
Dependent Claim
14 words
The method of claim 17, wherein said step of adding adds ions of potassium.
Claim 23
Dependent Claim
21 words
The method of claim 17, wherein said step of heating is carried out within the range of 400° to 800° C.
Claim 24
Dependent Claim
17 words
The method of claim 17, wherein said step of adding adds the ions as alkali metal hydroxides.
Claim 25
Dependent Claim
17 words
The method of claim 17, wherein the step of adding adds the ions as alkali metal carbonates.
Claim 26
Dependent Claim
17 words
The method of claim 17, wherein said step of adding adds the ions as alkali metal bicarbonates.
Claim 27
Dependent Claim
33 words
The method of claim 17, wherein said step of adding adds the ions as a solution of a sodium containing salt of a strong acid together with a sodium salt that exhibits alkalinity.
Claim 28
Dependent Claim
29 words
The method of claim 17, wherein said step of adding adds the ions as a solution of a sodium containing salt of a strong acid together with sodium hydroxide.
Claim 29
Independent Claim
90 words
A method of regenerating zeolite having adsorbed NH 4 + ions, comprising the steps of: submerging said zeolite in an aqueous solution containing ions of at least one alkaline earth metal to the zeolite to make an aqueous mixture, wherein the mol ratio of said alkaline earth metal ions to said NH 4 + ions is in the range of 1 to 1.5; and heating the aqueous mixture with added ions to within the temperature range of 150° to 800° C. to release NH 3 gas without decomposing the zeolite.
Claim 30
Independent Claim
90 words
A method of regenerating zeolite having adsorbed NH 4 + ions, comprising the steps of: submerging said zeolite in an aqueous solution containing ions of at least one alkaline earth metal to the zeolite to make an aqueous mixture, wherein the mol ratio of said alkaline earth metal ions to said NH 4 + ions is in the range of 1 to 1.5; and heating the aqueous mixture with added ions to within the temperature range of 150° to 800° C. to release NH 3 gas without decomposing the zeolite.
Claim 31
Dependent Claim
14 words
The method of claim 26, wherein said step of adding adds ions of magnesium.
Claim 32
Dependent Claim
14 words
The method of claim 26, wherein said step of adding adds ions of calcium.
Claim 33
Dependent Claim
21 words
The method of claim 26, wherein said step of heating is carried out within the range of 400° to 800° C.
Claim 34
Dependent Claim
13 words
The method of claim 26, wherein said ions are alkaline earth metal hydroxides.
Claim 35
Dependent Claim
13 words
The method of claim 26, wherein said ions are alkaline earth metal carbonates.
Claim 36
Dependent Claim
13 words
The method of claim 26, wherein said ions are alkaline earth metal bicarbonates.
References Cited (Backward Citations)
US1074337A
Cited
US1189896A
Cited
US3723308A
Cited
JPS4978676A
Cited
US3960760A
Cited
US4122007A
Cited
JPS5242431A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-08-26 | 1984-02-25 | 1984-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-08-26 | 1988-02-25 | 1988-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-08-26 | 1992-02-25 | 1992-08-26 | $7700.00 | Window Closed / Lapsed |