Patent US5130053A successfully refreshed from Google Patents.
US5130053A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilization of concentrated hydrogen peroxide solutions
Assignee: Solvay Interox Ltd
•
Filing: 1990-07-17
•
Granted: 1992-07-14
•
Expires: 2010-07-17
Abstract
Abstract Concentrated solutions of hydrogen peroxide tend to decompose on storage, thereby losing their effectiveness, amongst other reasons by virtue of interaction with contaminating transition metals. Peroxygen compounds are stabilized by contact with a stabilizing amount of compound of general formula: ##STR1## in which X represents a methylene phosphonic acid group of formula --CH 2 --(--PO 3 H 2 ) or salt thereof, R represents a tetra methylene diradical, optionally alkyl-substituted, that completes a cyclo-aliphatic ring and thereby establishes the two NX 2 groups in a substantially fixed configuration and Y represents a hydrogen or lower alkyl group. Preferably, the solutions contain additionally one or more co-stabilizers, including stannate, phosphates, hydroxybenzoic acid, citric acid and nitrate. The stabilizer system can enable the solution to be diluted, even with municipal water.
Inventors
- 👤 Neil D. Feasey
- 👤 Gareth W. Morris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:12
CPC Classifications
C; C01; C01B; C01B15/00; C01B15/01; C01B15/013; C01B15/037
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
106 words
In a process for stabilising a concentrated aqueous acidic hydrogen peroxide solution containing at least 25% by weight of hydrogen peroxide against decomposition in which the hydrogen peroxide is brought into contact with an effective amount of a stabiliser, the improvement in which the stabiliser has the general formula: ##STR4## in which X represents a methylene phosphonic acid group of formula --CH 2 --(--PO 3 H 2 ) or salt thereof, R represents a tetra methylene diradical, optionally alkyl-substituted, that completes a cyclo-aliphatic ring and thereby establishes the two NX 2 groups in a substantially fixed configuration and Y represents a hydrogen or lower alkyl group.
Claim 2
Dependent Claim
106 words
In a process for stabilising a concentrated aqueous acidic hydrogen peroxide solution containing at least 25% by weight of hydrogen peroxide against decomposition in which the hydrogen peroxide is brought into contact with an effective amount of a stabiliser, the improvement in which the stabiliser has the general formula: ##STR4## in which X represents a methylene phosphonic acid group of formula --CH 2 --(--PO 3 H 2 ) or salt thereof, R represents a tetra methylene diradical, optionally alkyl-substituted, that completes a cyclo-aliphatic ring and thereby establishes the two NX 2 groups in a substantially fixed configuration and Y represents a hydrogen or lower alkyl group.
Claim 3
Dependent Claim
14 words
A process according to claim 1 in which the stabiliser is cyclohexane-1,2-diaminotetramethylene phosphonic acid.
Claim 4
Dependent Claim
35 words
A process according to claim 1 or 2 in which the stabiliser is introduced into aqueous acidic solution containing hydrogen peroxide in a weight ratio of stabiliser to hydrogen peroxide of from 1:140 to 1:70000.
Claim 5
Dependent Claim
52 words
A process according to claim 1 in which the stabiliser is employed in conjunction with a co-stabiliser selected from the group consisting of organic acids containing a carboxylic or sulfonic acid group and containing a further functional group selected from the group consisting of carboxylic acid, sulfonic acid, hydroxyl and amino groups.
Claim 6
Dependent Claim
17 words
A process according to claim 4 in which the co-stabiliser comprises an aliphatic or aromatic hydroxycarboxylic acid.
Claim 7
Dependent Claim
16 words
A process according to claim 5 in which the co-stabiliser is citric acid or p-hydroxybenzoic acid.
Claim 8
Dependent Claim
18 words
A process according to claim 1 in which the stabiliser is employed in conjunction with a phosphate co-stabiliser.
Claim 9
Dependent Claim
24 words
A process according to claim 4 in which the co-stabiliser is employed in a weight ratio to the stabiliser of up to about 1:1.
Claim 10
Dependent Claim
29 words
A process according to claim 1 in which the stabiliser is employed in conjunction with a stannate co-stabiliser or a nitrate capable of passivating an aluminum surface, or both.
Claim 11
Dependent Claim
85 words
A concentrated aqueous acidic solution of hydrogen peroxide containing at least 25% by weight of hydrogen peroxide and stabilised by an effective amount of a compound of formula: ##STR5## in which X represents a methylene phosphonic acid group of formula --CH 2 --(--PO 3 H 2 ) or salt thereof, R represents a tetra methylene diradical, optionally alkyl-substituted, that completes a cyclo-aliphatic ring and thereby establishes the two NX 2 groups in a substantially fixed configuration and Y represents a hydrogen or lower alkyl group.
Claim 12
Dependent Claim
85 words
A concentrated aqueous acidic solution of hydrogen peroxide containing at least 25% by weight of hydrogen peroxide and stabilised by an effective amount of a compound of formula: ##STR5## in which X represents a methylene phosphonic acid group of formula --CH 2 --(--PO 3 H 2 ) or salt thereof, R represents a tetra methylene diradical, optionally alkyl-substituted, that completes a cyclo-aliphatic ring and thereby establishes the two NX 2 groups in a substantially fixed configuration and Y represents a hydrogen or lower alkyl group.
References Cited (Backward Citations)
US3387939A
Cited
US3701825A
Cited
US3740187A
Cited
US3903244A
Cited
US4059678A
Cited
US4155738A
Cited
US4304762A
Cited
US4320102A
Cited
US4614646A
Cited
US4725281A
Cited
US4770808A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-07-14 | 1996-01-13 | 1996-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-07-14 | 2000-01-13 | 2000-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-07-14 | 2004-01-13 | 2004-07-14 | $7700.00 | Window Closed / Lapsed |