US3909403A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of treating waste water
Assignee: Fujifilm Holdings Corp
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Filing: 1973-10-18
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Granted: 1975-09-30
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Expires: 1993-10-18
Abstract
Abstract In a process of removing ferricyanide ions and/or ferrocyanide ions from a waste solution or water containing these ions formed in photographic processings by bringing the waste solution in contact with a weakly-basic anion-exchange resin to absorb the ferricyanide ions and/or ferrocyanide ions on the anion-exchange resin, an alkaline concentrate of the ferricyanide ions and/or ferrocyanide ions is formed by immersing the weakly-basic anionexchange resin having absorbed thereon the ions and after adding to the concentrate a strong alkali, a hypochlorite, and bromide ions to increase the pH of the concentrate to above 12, the mixture is heated to temperatures over 50*C at normal pressure, whereby the ferricyanide ion and/or ferrocyanide ions are decomposed.
Inventors
- 👤 Akira Abe
- 👤 Yoshio Usui
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:52
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/72; C02F1/76; C02F1/766; B; B01; B01J; B01J41/00; B01J41/04; B01J41/07; C02F2101/00; C02F2101/10; C02F2101/16; C02F2101/18; C02F2101/20; C02F2101/203
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
145 words
A PROCESS FOR TREATING WASTE WATER CONTAINING FERRICYANIDE IONS AND FERROCYANIDE IONS WHICH COMPRISES BRINGING SAID WASTE WATER CONTAINING THESE IONS INTO CONTACT WITH A WEAKLYBASIC ANION-EXCHANGE RESIN FOR ADSORPTION OF FERRICYANIDE AND FERROCYANIDE IONS ON SAID RESIN, REMOVING SAID WEAKLY-BASIC ANION-EXCHANGE RESIN HAVING ADSORBED THEREON FERRICYANIDE AND FERROCYANIDE IONS FROM SAID WASTE WATER, IMMERSING SAID WEAKLY-BASIC ANION-EXCHANGING RESIN HAVING SAID FERRICYANIDE AND FERROCYANIDE IONS ADSORBED THEREON INTO AN ALKALINE SOLUTION TO PROVIDE AN ALKALINE CONCENTRATED SOLUTION OF SAID FERRICYANIDE AND FERROCYANIDE IONS, ADDING TO SAID ALKALINE CONCENTRATED SOLUTION A STRONG ALKALI, A HYPOCHLORITE, AND BROMIDE IONS SO THAT THE PH OF SAID SOLUTION IS ABOVE 12, AND HEATING SAID SOLUTION TO TEMPERATURES ABOUT 50*C AT NORMAL PRESSURE, WHEREBY SAID FERRICYANIDE AND FERROCYANIDE IONS ARE DECOMPOSED, WHEREIN SAID BROMIDE IONS SERVE TO ACCELERATE THE HEAT DECOMPOSITION OF FERRICYANIDE IONS AND FERROCYANIDE IONS DURING SAID HEAING.
Claim 2
Dependent Claim
145 words
A PROCESS FOR TREATING WASTE WATER CONTAINING FERRICYANIDE IONS AND FERROCYANIDE IONS WHICH COMPRISES BRINGING SAID WASTE WATER CONTAINING THESE IONS INTO CONTACT WITH A WEAKLYBASIC ANION-EXCHANGE RESIN FOR ADSORPTION OF FERRICYANIDE AND FERROCYANIDE IONS ON SAID RESIN, REMOVING SAID WEAKLY-BASIC ANION-EXCHANGE RESIN HAVING ADSORBED THEREON FERRICYANIDE AND FERROCYANIDE IONS FROM SAID WASTE WATER, IMMERSING SAID WEAKLY-BASIC ANION-EXCHANGING RESIN HAVING SAID FERRICYANIDE AND FERROCYANIDE IONS ADSORBED THEREON INTO AN ALKALINE SOLUTION TO PROVIDE AN ALKALINE CONCENTRATED SOLUTION OF SAID FERRICYANIDE AND FERROCYANIDE IONS, ADDING TO SAID ALKALINE CONCENTRATED SOLUTION A STRONG ALKALI, A HYPOCHLORITE, AND BROMIDE IONS SO THAT THE PH OF SAID SOLUTION IS ABOVE 12, AND HEATING SAID SOLUTION TO TEMPERATURES ABOUT 50*C AT NORMAL PRESSURE, WHEREBY SAID FERRICYANIDE AND FERROCYANIDE IONS ARE DECOMPOSED, WHEREIN SAID BROMIDE IONS SERVE TO ACCELERATE THE HEAT DECOMPOSITION OF FERRICYANIDE IONS AND FERROCYANIDE IONS DURING SAID HEAING.
Claim 3
Dependent Claim
44 words
The process of claim 1, wherein said bringing of said waste water into contact with said weakly-basic anion-exchange resin is in the presence of at least one member selected from the group consisting of borate ions, a weak acid and a weak acid salt.
Claim 4
Dependent Claim
13 words
The process of claim 2, wherein said waste water additionally contains thiosulfate ions.
Claim 5
Dependent Claim
15 words
The process of claim 3, wherein said waste water is waste water from photographic processings.
Claim 6
Dependent Claim
36 words
The process of claim 2, wherein said borate ions are from a compound containing borate ions, said compound containing borate ions being selected from the group consisting of boric acid, metaboric acid, or water-soluble borate salts.
Claim 7
Dependent Claim
34 words
The process of claim 5, wherein said borate ions are present in an amount of from 1/5 to 104 times the total of the moles of said ferricyanide ions and said ferrocyanide ions present.
Claim 8
Dependent Claim
23 words
The process of claim 2, wherein said weak acid is selected from the group consisting of an organic acid and an inorganic acid.
Claim 9
Dependent Claim
56 words
The process of claim 7, wherein said organic acid is selected from the group consisting of acetic acid, citric acid, maleic acid, fumaric acid, oxalic acid, tartaric acid, formic acid, malonic acid, phthalic acid, or succinic acid, and wherein said inorganic acid is selected from the group consisting of phosphoric acid, boric acid, or sulfurous acid.
Claim 10
Dependent Claim
45 words
The process of claim 2, wherein said weak acid salt is a member selected from the group consisting of an alkali metal salt or an ammonium salt of a member selected from the group consisting of a weak organic acid and a weak inorganic acid.
Claim 11
Dependent Claim
63 words
The process of claim 9, wherein said weak acid salt is a member selected from the group consisting of an alkali metal salt and an ammonium salt of a member selected from the group consisting of acetic acid, citric acid, maleic acid, fumaric acid, oxalic acid, tartaric acid, formic acid, malonic acid, phthalic acid, succinic acid, phosphoric acid, boric acid, and sulfurous acid.
Claim 12
Dependent Claim
47 words
The process of claim 2, wherein said member selected from the group consisting of said weak acid and said weak acid salt is present at from 1/10 to 105 times the total numer of moles of said ferricyanide ions and said ferrocyanide ions in said waste water.
Claim 13
Dependent Claim
13 words
The process of claim 1, wherein said waste water additionally contains thiosulfate ions.
Claim 14
Dependent Claim
15 words
The process of claim 1, wherein said waste water is waste water from photographic processings.
Claim 15
Dependent Claim
26 words
The process of claim 1, wherein said ferricyanide ions and said ferrocyanide ions are present in said waste water at a concentration lower than 3,000 ppm.
Claim 16
Dependent Claim
31 words
The process of claim 1, wherein said alkaline solution comprises a solution of a member selected from the group consisting of an alkali metal hydroxide, an alkali metal carbonate, or ammonia.
Claim 17
Dependent Claim
19 words
The process of claim 15, wherein the concentration of said alkali solution is about 1 to 20% by weight.
Claim 18
Dependent Claim
30 words
The process of claim 1, wherein said hypochlorite is a member selected from the group consisting of sodium hypochlorite, potassium hypochlorite, calcium hypochlorite, or chlorine in an aqueous alkaline solution.
Claim 19
Dependent Claim
44 words
The process of claim 1, wherein said bromide ions are from a compound containing bromide ions, said compound being a member selected from the group consisting of an alkali metal bromide, an alkaline earth metal bromide, a water soluble metal bromide, or ammonium bromide.
Claim 20
Dependent Claim
19 words
The process of claim 18, wherein said bromide ions are present at a concentration of higher than 0.1 g/liter.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-29 | 1979-03-31 | 1979-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-29 | 1983-03-31 | 1983-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-29 | 1987-03-31 | 1987-09-30 | $7700.00 | Window Closed / Lapsed |