EP0066992A1
Expired / Lapsed
EP
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Process for the production of a peroxy compound
Assignee: Solvay Interox Ltd
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Filing: 1982-05-21
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Granted: —
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Expires: 2002-05-21
Abstract
Abstract In the present invention, hydrated magnesium salts of the carboxylate group in certain aromatic or olefinically unsaturated peroxyacids such as monoperoxyphthalic acid or monoperoxymaleic acid are made by reacting the corresponding anhydride with aqueous hydrogen peroxide and a magnesium base, in the absence of a significant amount of free iron. By so doing, the process avoids the use of non-aqueous solvents such as ethyl acetate. Solid product can be obtained by using no more than enough hydrogen peroxide and water for solely a damp product to be obtained or by crystallization from an aqueous solution, preferably with recycle of the mother liquor. Preferably the reaction temperature is maintained at 5 DEG to 25 DEG C., employing 1.8 to 2.2 moles anhyhdride per mole of magnesium base, and 0.95 to 1.2 moles of hydrogen peroxide per mole of anhydride. The product can be used as a bleach and as a disinfectant.
Inventors
- 👤 Geoffrey John Hignett
- 👤 Iain Stewart Mackirdy
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 20:06
CPC Classifications
A; A01; A01N; A01N37/00; A01N37/16; C; C07; C07C; C07C407/00; C11; C11D; C11D3/00; C11D3/39; C11D3/3945; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/582
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
200 words
A process for the production of hydrated magnesium salts by reaction between hydrogen peroxide, anhydride, base and water characterised in that the corresponding anhydride to form a compound of classes 1 or 3 comprising - Class (l)- aromatic carbocyclic compounds substituted around the aromatic nucleus by a carboxylate group and a peroxycarboxylic acid group both groups being derivable from the corresponding aromatic carbocyclic anhydride by reaction with hydrogen peroxide, said aromatic carboxylic compound optionally being further substituted by at least one of the groups selected from alkyl, carboxylate, sulphonate, nitro, chloro and bromo groups and Class (3)- olefinically unsaturated aliphatic percarboxylic acids in which the carbonyl group of the peroxycarboxylic acid substituent is conjugated with the carbonyl group of a carboxylate substituent via olefinic unsaturation which carboxylate and peroxycarboxylic acid substituents are derivable from the corresponding anhydride by reaction with hydrogen peroxide, and a magnesium base are brought into contact with an aqueous medium comprising hydrogen peroxide and water, in such an amount that at least some hydrated magnesium salt of the carboxylate group precipitates out, the reaction being conducted in the presence of no free iron or less than a significant amount of free iron in the reaction mixture.
Claim 2
Dependent Claim
200 words
A process for the production of hydrated magnesium salts by reaction between hydrogen peroxide, anhydride, base and water characterised in that the corresponding anhydride to form a compound of classes 1 or 3 comprising - Class (l)- aromatic carbocyclic compounds substituted around the aromatic nucleus by a carboxylate group and a peroxycarboxylic acid group both groups being derivable from the corresponding aromatic carbocyclic anhydride by reaction with hydrogen peroxide, said aromatic carboxylic compound optionally being further substituted by at least one of the groups selected from alkyl, carboxylate, sulphonate, nitro, chloro and bromo groups and Class (3)- olefinically unsaturated aliphatic percarboxylic acids in which the carbonyl group of the peroxycarboxylic acid substituent is conjugated with the carbonyl group of a carboxylate substituent via olefinic unsaturation which carboxylate and peroxycarboxylic acid substituents are derivable from the corresponding anhydride by reaction with hydrogen peroxide, and a magnesium base are brought into contact with an aqueous medium comprising hydrogen peroxide and water, in such an amount that at least some hydrated magnesium salt of the carboxylate group precipitates out, the reaction being conducted in the presence of no free iron or less than a significant amount of free iron in the reaction mixture.
Claim 3
Dependent Claim
23 words
A process according to claim 1 characterised in that there is employed at least 100g anhydride and magnesium base per 1000g aqueous phase.
Claim 4
Dependent Claim
29 words
A process according to claim 1 or 2 characterised in that there is employed hydrogen peroxide in an equivalent mole ratio to the anhydride of from 0.9:1 to 2:1.
Claim 5
Dependent Claim
23 words
A process according to claim 3 characterised in that the equivalent mole ratio of hydrogen peroxide to anhydride is from 0.95:1 to 1.2:1.
Claim 6
Dependent Claim
27 words
A process according to any preceding claim characterised in that there is employed an equivalent mole ratio of anhydride to magnesium base of from 1.5:1 to 2.5:1.
Claim 7
Dependent Claim
23 words
A process according to claim 5 characterised in that the equivalent mole ratio of anhydride to magnesium base is from 1.8:1 to 2.2:1.
Claim 8
Dependent Claim
23 words
A process according to any preceding claim characterised in that the reaction mixture is maintained at a temperature of not more than 30°C.
Claim 9
Dependent Claim
23 words
A process according to claim 7 characterised in that the reaction mixture is maintained at a temperature of 5 to 25 0 C.
Claim 10
Dependent Claim
33 words
A process according to any preceding claim charaterised in that the free iron content of the magnesium base is not more than 25 x 10- 6 moles of iron per mole of base.
Claim 11
Dependent Claim
38 words
A process according to any preceding claim characterised in that the magnesium base and anhydride are introduced into the aqueous phase containing hydrogen peroxide and maintained in contact during a period in total of 20 to 150 minutes.
Claim 12
Dependent Claim
16 words
ll. A process according to any preceding claim characterised in that the anhydride is phthalic anhydride.
Claim 13
Dependent Claim
20 words
A process according to any preceding claim characterised in that magnesium base is magnesium oxide, hydroxide, carbonate or basic carbonate.
Claim 14
Dependent Claim
46 words
A process according to any preceding claim characterised in that mother liquor separated from the solids is analysed for peroxyacid, hydrogen peroxide and magnesium contents and is recycled, and in the subsequent cycle further amounts of anhydride, magnesium base and where necessary hydrogen peroxide are added.
Claim 15
Dependent Claim
54 words
A process according to claim 13 in which the anhydride, magnesium base, hydrogen peroxide and water are introduced into the recycled mother liquor in equivalent mole ratios of anhydride to magnesium base of 1.8 to 2.2:1; hydrogen peroxide to anhydride of 0.95 to 1.2:1, and water to magnesium base of 5 to 12:1 respectively.
Claim 16
Dependent Claim
33 words
A process according to any preceding claim characterised in that the amount of reactants added produces a slurry having a solid product content on a dry weight basis of from 15% to 45%.
Claim 17
Dependent Claim
52 words
A process according to any of claims 1 to 12 characterised in that the reaction mixture comprises equivalent mole ratios of a) anhydride, b) hydrogen peroxide and c) total water to the magnesium base in the ranges of respectively a) 1.5:1 to 2.5:1, b) 1.5:1 to 3.0:1 and c) 5:1 to 12:1.
Claim 18
Dependent Claim
33 words
A process according to any preceding claim characterised in that there is employed any novel feature described but no specifically claimed herein, either alone or in combination with any other feature described herein.
Claim 19
Dependent Claim
34 words
A process for producing a magnesium salt of a peroxyacid substantially as described herein with respect to any of Examples 1 to 21, or 23 to 25 or run A or B of 26.
Claim 20
Dependent Claim
34 words
A process for producing a magnesium salt of a peroxyacid substantially as described herein with respect to any of Examples 1 to 21, or 23 to 25 or run A or B of 26.
Claim 21
Dependent Claim
15 words
A magnesium salt of peroxyacid whenever obtained by a process according to any preceding claim.
References Cited (Backward Citations)
FR84486E
Cited
FR1371865A
Cited
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