Percarboxylic acid solutions
First Claim
1. A process for the production of aqueous percarboxylic acid solutions by reaction of a peroxygen compound and a precursor of the percarboxylic acid in the presence of an acid catalyst wherein the peroxygen compound comprises hydrogen peroxide and the precursor comprises an aliphatic diester satisfying the general formula R1—
- O—
CO—
R2—
CO—
O—
R3 wherein R1 and R3 each represents an alkyl group containing from 1 to 4 carbon atoms which may be the same or different and R2 represents an alkylene group which may be linear or branched containing from 2 to 6 carbon atoms and optionally unsaturated, and wherein the reaction mixture expressed in terms of its reactants comprises at least 3% diester.
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Abstract
Storage stable aqueous acidic solutions, often having a pH of up to 1 containing an ester peracid and/or an acid peracid can be obtained by reacting a diester satisfying the general formula R1—O—CO—R2—CO—O—R3 in which R1 and R3 each represents a alkyl group containing from 1 to 4 carbon atoms which may the same of different and R2 represents an aliphatic alkylene group optionally unsaturated which may be linear or branched containing from 2 to 6 carbon atoms with aqueous hydrogen peroxide in the presence of an acid, such as sulphuric acid and permitting the compositions to progress towards equilibrium concentrations. By starting with a diester, perhydrolysis generates an ester peracid which is a particularly effective peracid. The process can be controlled to produce solutions containing a high peracid content and within a wide range of ratios of ester peracid to acid peracid.
89 Citations
52 Claims
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1. A process for the production of aqueous percarboxylic acid solutions by reaction of a peroxygen compound and a precursor of the percarboxylic acid in the presence of an acid catalyst wherein the peroxygen compound comprises hydrogen peroxide and the precursor comprises an aliphatic diester satisfying the general formula R1—
- O—
CO—
R2—
CO—
O—
R3 wherein R1 and R3 each represents an alkyl group containing from 1 to 4 carbon atoms which may be the same or different and R2 represents an alkylene group which may be linear or branched containing from 2 to 6 carbon atoms and optionally unsaturated, and wherein the reaction mixture expressed in terms of its reactants comprises at least 3% diester. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 43, 44, 45, 46, 50)
- O—
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30. A composition comprising an ester, a peracid derivative thereof, hydrogen peroxide and water comprising at from 2 to 30% w/w hydrogen peroxide, 5 to 90% w/w water and 3 to 90% w/w of an aliphatic diester satisfying the general formula R1—
- O—
CO—
R2—
CO—
O—
R3 in which R1 and R3 each represents an alkyl group containing from 1 to 4 carbon atoms which may be the same or different and R2 represents an alkylene group which may be linear or branched containing from 2 to 6 carbon atoms and optionally unsaturated, the % w/w for the diester including the peracidic derivative thereof and any acidic derivative of the ester generated in situ, the composition including a residual concentration of the diester. - View Dependent Claims (31, 33, 34, 35, 36, 37, 38, 39, 40, 41, 47, 48, 49, 51, 52)
- O—
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32. A composition containing hydrogen peroxide, a peracid and an ester and hydrolysis perhydrolysis derivatives thereof comprising at least 2% w/w hydrogen peroxide, and at least 3% w/w diester including hydrolysis and perhydrolysis derivatives thereof, of which at least 0.1 is an ester peracid, the composition including a residual concentration of the diester.
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42. A composition comprising an ester, a peracid derivative thereof, hydrogen peroxide and water comprising from 2 to 30% w/w hydrogen peroxide, 5 to 90% w/w water and 3 to 90% w/w of an aliphatic diester satisfying the general formula R1—
- O—
CO—
R2—
CO—
O—
R3 in which R1 and R3 each represents an alkyl group containing from 1 to 4 carbon atoms which may be the same or different and R2 represents an alkylene group which may be linear or branched containing from 2 to 6 carbon atoms and optionally unsaturated, the % for the diester including the peracidic derivative thereof and any acidic derivative of the ester generated in situ and containing a C1 to C4 alcohol in the range of from 1 to 20% w/w and at a mole ratio to the aliphatic diester of greater than 1;
1.
- O—
Specification