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US4308147A
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Composition and treating aqueous solutions with N-carboxy alkyl amino alkane polyphosphonic acids and their alkali metal salts
Assignee: BK Giulini Chemie GmbH
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Filing: 1979-11-07
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Granted: 1981-12-29
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Expires: 1999-11-07
Abstract
Abstract Disclosed are a composition and method for treating aqueous solutions with N-carboxy alkyl amino alkane polyphosphonic acids which have more than two carbon atoms in their carboxy alkyl group, and their alkali metal salts. The acids and salts are prepared in a good yield by reacting alkali metal salts of amino alkane phosphonic acids in which at least one hydrogen atom of the amino group is unsubstituted, in an alkaline medium with an α,β-unsaturated carboxylic acid at increased temperature. The free acids are preferably recovered from the reaction solution by a treatment with a cation exchange agent. In place of the α,β-unsaturated carboxylic acids there can also be used their anhydrides, esters, or nitriles. The resulting polyphosphonic acids have a good complexing or sequestering effect on polyvalent metal ions.
Inventors
- 👤 Klaus Sommer
- 👤 Hermann Weber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 02:59
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/38; C07F9/3804; C07F9/3839; C07F9/3873; C02; C02F; C02F5/00; C02F5/08; C02F5/10; C02F5/14; C07F9/3808
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
182 words
A composition having a high complexing and sequestering power for polyvalent metal ions and being capable of stabilizing the hardness-causing agents in water, said composition comprising an N-carboxy alkyl amino alkane phosphonic acid of the formula ##STR7## in which (A) R 1 is hydrogen; R 2 is hydrogen; R 3 is the methylphosphonic acid group; and R 4 is the group of the formula ##STR8## said acid being the N,N-bis-phosphono methane-2-amino succinic acid, or (B) R 1 is hydrogen; R 2 is the phosphonic acid group; R 3 is hydrogen; and R 4 is the group of the formula ##STR9## said acid being the N-(1,2-dicarboxy ethyl) amino methane diphosphonic acid, or (C) R 1 is methyl; R 2 is the phosphonic acid group; R 3 is hydrogen; and R 4 is the group of the formula ##STR10## said acid being the N-(1,2-dicarboxy ethyl) amino ethane diphosphonic acid, or (D) R 1 is the group ##STR11## R 2 is the phosphonic acid group; R 3 is hydrogen; and R 4 is carboxy ethyl; said acid being the N,N-dicarboxy ethyl-1,6-diamino hexane-1,1,6,6-tetraphosphonic acid; and water.
Claim 2
Dependent Claim
182 words
A composition having a high complexing and sequestering power for polyvalent metal ions and being capable of stabilizing the hardness-causing agents in water, said composition comprising an N-carboxy alkyl amino alkane phosphonic acid of the formula ##STR7## in which (A) R 1 is hydrogen; R 2 is hydrogen; R 3 is the methylphosphonic acid group; and R 4 is the group of the formula ##STR8## said acid being the N,N-bis-phosphono methane-2-amino succinic acid, or (B) R 1 is hydrogen; R 2 is the phosphonic acid group; R 3 is hydrogen; and R 4 is the group of the formula ##STR9## said acid being the N-(1,2-dicarboxy ethyl) amino methane diphosphonic acid, or (C) R 1 is methyl; R 2 is the phosphonic acid group; R 3 is hydrogen; and R 4 is the group of the formula ##STR10## said acid being the N-(1,2-dicarboxy ethyl) amino ethane diphosphonic acid, or (D) R 1 is the group ##STR11## R 2 is the phosphonic acid group; R 3 is hydrogen; and R 4 is carboxy ethyl; said acid being the N,N-dicarboxy ethyl-1,6-diamino hexane-1,1,6,6-tetraphosphonic acid; and water.
Claim 3
Dependent Claim
53 words
A composition according to claim 1, wherein the N-carboxy alkyl amino alkane polyphosphonic acid has the formula ##STR12## in which R 1 is hydrogen; R 2 is hydrogen; R 3 is the methylphosphonic acid group; and R 4 is the group of the formula ##STR13## said acid being the N,N-bis-phosphono methane-2-amino succinic acid.
Claim 4
Dependent Claim
42 words
A composition according to claim 1, wherein R 1 is hydrogen; R 2 is the phosphonic acid group; R 3 is hydrogen; and R 4 is the group of the formula ##STR14## said acid being the N-(1,2-dicarboxy ethyl) amino methane diphosphonic acid.
Claim 5
Dependent Claim
42 words
A composition according to claim 1, wherein R 1 is methyl; R 2 is the phosphonic acid group; R 3 is hydrogen; and R 4 is the group of the formula ##STR15## said acid being the N-(1,2-dicarboxy ethyl) amino ethane diphosphonic acid.
Claim 6
Dependent Claim
38 words
A composition according to claim 1, wherein R 1 is the group ##STR16## R 2 is the phosphonic acid group; R 3 is hydrogen; and R 4 is carboxy ethyl; said acid being the N,N-dicarboxy ethyl-1,6-diamino hexane-1,1,6,6-tetraphosphonic acid.
Claim 7
Independent Claim
190 words
A method of treating an aqueous system for stabilizing polyvalent metal ions, comprising the step of adding to the aqueous system an amount which is sufficient to stabilize the polyvalent metal ions in the system of an N-carboxy alkyl amino alkane phosphonic acid of the formula ##STR17## in which (A) R 1 is hydrogen; R 2 is hydrogen; R 3 is the methylphosphonic acid group; and R 4 is the group of the formula ##STR18## said acid being the N,N-bis-phosphono methane-2-amino succinic acid, or (B) R 1 is hydrogen; R 2 is the phosphonic acid group; R 3 is hydrogen; and R 4 is the group of the formula ##STR19## said acid being the N-(1,2-dicarboxy ethyl) amino methane diphosphonic acid, or (C) R 1 is methyl; R 2 is the phosphonic acid group; R 3 is hydrogen; and R 4 is the group of the formula ##STR20## said acid being the N-(1,2-dicarboxy ethyl) amino ethane diphosphonic acid, or (D) R 1 is the group ##STR21## R 2 is the phosphonic acid group; R 3 is hydrogen; and R 4 is carboxy ethyl; said acid being the N,N-dicarboxy ethyl-1,6-diamino hexane-1,1,6,6-tetraphosphonic acid.
Claim 8
Independent Claim
190 words
A method of treating an aqueous system for stabilizing polyvalent metal ions, comprising the step of adding to the aqueous system an amount which is sufficient to stabilize the polyvalent metal ions in the system of an N-carboxy alkyl amino alkane phosphonic acid of the formula ##STR17## in which (A) R 1 is hydrogen; R 2 is hydrogen; R 3 is the methylphosphonic acid group; and R 4 is the group of the formula ##STR18## said acid being the N,N-bis-phosphono methane-2-amino succinic acid, or (B) R 1 is hydrogen; R 2 is the phosphonic acid group; R 3 is hydrogen; and R 4 is the group of the formula ##STR19## said acid being the N-(1,2-dicarboxy ethyl) amino methane diphosphonic acid, or (C) R 1 is methyl; R 2 is the phosphonic acid group; R 3 is hydrogen; and R 4 is the group of the formula ##STR20## said acid being the N-(1,2-dicarboxy ethyl) amino ethane diphosphonic acid, or (D) R 1 is the group ##STR21## R 2 is the phosphonic acid group; R 3 is hydrogen; and R 4 is carboxy ethyl; said acid being the N,N-dicarboxy ethyl-1,6-diamino hexane-1,1,6,6-tetraphosphonic acid.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-12-28 | 1985-06-29 | 1985-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-12-28 | 1989-06-29 | 1989-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-12-28 | 1993-06-29 | 1993-12-29 | $7700.00 | Window Closed / Lapsed |