US4215009A
Expired / Lapsed
US
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Purification method
Assignee: De Nora SpA
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Filing: 1978-09-07
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Granted: 1980-07-29
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Expires: 1998-09-07
Abstract
Abstract A novel method of reducing metal impurities in aqueous alkali metal halide solutions, especially alkaline earth metal ions, and to novel organic solvent compositions having a synergistic activity for removal of metal impruties from aqueous solutions.
Inventors
- 👤 Placido M. Spaziante
- 👤 Luigi Giuffre
- 👤 Aldo Castoldi
- 👤 Giancarlo Sioli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 02:41
CPC Classifications
C; C01; C01D; C01D3/00; C01D3/14; C01D3/18
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
96 words
A process for reducing metal ion concentration in aqueous alkali metal halide brines to a level below 0.2 mg/l comprising contacting an aqueous alkaline alkali metal halide brine having a pH of 10.5 to 12 and containing metal ion impurities with a water-immiscible organic solvent containing an effective amount of at least one complexing agent of the group consisting of 1-aryl-3-methyl-4-acylpyrazol-5-one wherein the acyl is derived from an organic carboxylic acid of 1 to 18 carbon atoms and a thenoyl-substituted keto compound and a complexing additive selected from the group consisting of trialkylphosphine oxides and trialkylphosphates.
Claim 2
Dependent Claim
96 words
A process for reducing metal ion concentration in aqueous alkali metal halide brines to a level below 0.2 mg/l comprising contacting an aqueous alkaline alkali metal halide brine having a pH of 10.5 to 12 and containing metal ion impurities with a water-immiscible organic solvent containing an effective amount of at least one complexing agent of the group consisting of 1-aryl-3-methyl-4-acylpyrazol-5-one wherein the acyl is derived from an organic carboxylic acid of 1 to 18 carbon atoms and a thenoyl-substituted keto compound and a complexing additive selected from the group consisting of trialkylphosphine oxides and trialkylphosphates.
Claim 3
Dependent Claim
36 words
The process of claim 1 wherein the complexing agent has the formula ##STR5## wherein RCO is an acyl of an organic carboxylic acid of 1 to 18 carbon atoms and R 1 is an aryl group.
Claim 4
Dependent Claim
29 words
The process of claim 2 wherein the complexing agent is selected from the group consisting of 1-phenyl-3-methyl-4-acetyl-pyrazol-5-one, 1-phenyl-3-methyl-4-propionyl-pyrazol-5-one, 1-phenyl-3-methyl-4-butyryl-pyrazol-5-one, 1-phenyl-3-methyl-4-chloroacetyl-pyrazol-5-one, 1-phenyl-3-methyl-4-ethoxycarbonyl-pyrazol-5-one, 1-phenyl-3-methyl-4-p-bromobenzoyl-pyrazol-5-one, 1-phenyl-3-methyl-4-p-nitrobenzoyl-pyrazol-5-one, 1-phenyl-3-methyl-4-trifluoroacetyl-pyrazol-5-one, 1-phenyl-3-methyl-4-capronyl-pyrazol-5-one, 1-phenyl-3-methyl-4-benzoyl-pyrazol-5-one, 1-phenyl-3-methyl-4-p-chlorobenzoyl-pyrazol-5-one and 1-p-nitrophenyl-3-methyl-4-benzoyl-pyrazol-5-one.
Claim 5
Dependent Claim
42 words
The process of claim 1 wherein the complexing agent has the formula ##STR6## wherein R 2 is a carbonyl activating group and X is selected from the group consisting of hydrogen, halogen and alkyl and alkoxy of 1 to 5 carbon atoms.
Claim 6
Dependent Claim
11 words
The process of claim 1 wherein the complexing agent is thenoyl-trifluoroacetone.
Claim 7
Dependent Claim
20 words
The process of claim 1 wherein the complexing additive is selected from the group consisting of trialkylphosphates and trialkylphosphine oxides.
Claim 8
Dependent Claim
20 words
The process of claim 1 wherein the complexing additive is selected from the group consisting of tri-n-octylphosphine oxide and tributylphosphate.
Claim 9
Dependent Claim
25 words
The process of claim 1 wherein the organic solvent is selected from the group consisting of kerosene, benzene, toluene, xylene, carbon tetrachloride, amylalcohol and cyclohexane.
Claim 10
Dependent Claim
17 words
The process of claim 1 wherein the concentration of the complexing agent is 0.1 to 0.001 molar.
Claim 11
Dependent Claim
11 words
The process of claim 1 wherein the complexing agent is 1-phenyl-3-methyl-4-benzoyl-pyrazol-5-one.
Claim 12
Dependent Claim
80 words
A composition for reducing metal ion content of aqueous alkaline solutions comprising a solution of an water-immiscible organic solvent containing (a) 0.1 to 0.001 M of at least one complexing agent of the group consisting of 1-aryl-3-methyl-acyl-pyrazol-5-one wherein the acyl is derived from an organic carboxylic acid of 1 to 18 carbon atoms and a thenoyl-substituted keto compound and (b) 0.1 to 5% by volume of a complexing additive selected from the group consisting of trialkyl phosphine oxides and trialkylphosphates.
Claim 13
Dependent Claim
80 words
A composition for reducing metal ion content of aqueous alkaline solutions comprising a solution of an water-immiscible organic solvent containing (a) 0.1 to 0.001 M of at least one complexing agent of the group consisting of 1-aryl-3-methyl-acyl-pyrazol-5-one wherein the acyl is derived from an organic carboxylic acid of 1 to 18 carbon atoms and a thenoyl-substituted keto compound and (b) 0.1 to 5% by volume of a complexing additive selected from the group consisting of trialkyl phosphine oxides and trialkylphosphates.
Claim 14
Dependent Claim
36 words
The composition of claim 11 wherein the complexing agent has the formula ##STR7## wherein RCO is an acyl of an organic carboxylic acid of 1 to 18 carbon atoms and R 1 is an aryl group.
Claim 15
Dependent Claim
29 words
The composition of claim 11 wherein the complexing agent is selected from the group consisting of 1-phenyl-3-methyl-4-acetyl-pyrazol-5-one, 1-phenyl-3-methyl-4-propionyl-pyrazol-5-one, 1-phenyl-3-methyl-butyryl-pyrazol-5-one, 1-phenyl-3-phenyl-4-chloroacetyl-pyrazol-5-one, 1-phenyl-3-methyl-4-ethoxycarbonyl-pyrazol-5-one, 1-phenyl-3-methyl-4-p-bromobenzoyl-pyrazol-5-one, 1-phenyl-3-methyl-4-p-nitrobenzoyl-pyrazol-5-one, 1-phenyl-3-methyl-4-trifluoroacetyl-pyrazol-5-one, 1-phenyl-3-methyl-4-capronyl-pyrazol-5-one, 1-phenyl-3-methyl-4-benzoyl-pyrazol-5-one, 1-phenyl-3-methyl-4-p-chlorobenzoyl-pyrazol-5-one and 1-p-nitrophenyl-3-methyl-4-benzoyl-pyrazol-5-one.
Claim 16
Dependent Claim
42 words
The composition of claim 11 wherein the complexing agent has the formula ##STR8## wherein R 2 is a carbonyl activating group and X is selected from the group consisting of hydrogen, halogen and alkyl and alkoxy of 1 to 5 carbon atoms.
Claim 17
Dependent Claim
11 words
The composition of claim 11 wherein the complexing agent is thenoyl-trifluoroacetone.
Claim 18
Dependent Claim
20 words
The composition of claim 11 wherein the complexing additive is selected from the group consisting of trialkylphosphates and trialkylphosphine oxides.
Claim 19
Dependent Claim
20 words
The composition of claim 11 wherein the complexing additive is selected from the group consisting of tri-n-octylphosphine oxide and tributylphosphate.
Claim 20
Dependent Claim
25 words
The composition of claim 11 wherein the organic solvent is selected from the group consisting of kerosene, benzene, toluene, xylene, carbon tetrachloride, amylalcohol and cyclohexane.
Claim 21
Dependent Claim
42 words
A composition consisting essentially of kerosene containing 0.1 and 0.001 moles of a member selected from the group consisting of thenoyl trifluoracetone and 1-phenyl-3-methyl-4-benzoyl-pyrazol-5-one and 0.1 to 5% by volume of a member of the group consisting of tributylphosphate and tri-n-octylphosphine oxide.
Claim 22
Dependent Claim
42 words
A composition consisting essentially of kerosene containing 0.1 and 0.001 moles of a member selected from the group consisting of thenoyl trifluoracetone and 1-phenyl-3-methyl-4-benzoyl-pyrazol-5-one and 0.1 to 5% by volume of a member of the group consisting of tributylphosphate and tri-n-octylphosphine oxide.
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) | 1983-07-29 | 1984-01-28 | 1984-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-07-29 | 1988-01-28 | 1988-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-07-29 | 1992-01-28 | 1992-07-29 | $7700.00 | Window Closed / Lapsed |