Method of preparing organic peroxyacids
View Patent ↗A system for a fast-rate preparation just before use of organic peroxyacids, in a hydroalcoholic environment, by mixing at temperatures lower than 40° C., preferably lower than 25° C., a first reactant and a second reactant, kept separate from each other during storage, to obtain an activated solution, the first reactant is in the solid or liquid state at a temperature from 5 to 45° C. and includes at least one acyl donating group, and the second reactant is in the solid state, at least in the temperature range from 5° C. and 40° C., and comprises a peroxide anion source in a concentration such as to provide at least 10-fold molar excess of peroxide with respect to the stoichiometric amount of the acyl-donor, a biocidal agent including at least one C 1 –C 18 linear or branched aliphatic and/or aromatic alcohol, and a stabilizing buffer component suitable for keeping the second reactant at a desired pH value.
1. A system for a fast-rate preparation just before use of organic peroxyacids, in a hydroalcoholic environment, by mixing at a temperature lower than 40° C., a first reactant and a second reactant, kept separate from each other during storage, to obtain an activated solution, wherein:
said first reactant is an activator in solid or liquid state at a temperature from 5° C. to 45° C., is lipophilic, and comprises at least one acyl donating group, and
said second reactant is in liquid state, at least in the temperature range from 5° C. and 40° C., is hydrophilic, and comprises a peroxide anion source in a concentration such as to provide at least 10-fold molar excess of peroxide with respect to the stoichiometric amount of said at least one acyl-donor, a biocidal agent comprising at least one C 1 –C 18 linear or branched aliphatic and/or aromatic alcohol, and a stabilizing buffer component suitable for keeping said second reactant at a desired pH value.
2. A system as claimed in claim 1 , wherein said acyl-donor comprises a compound having the following general formula:
R 1 —CO—L
where L is a leaving group and R 1 is an alkyl, aralkyl or aryl group, each group having up to 24 carbon atoms and being either substituted or unsubstituted.
3. A system as claimed in claim 2 , wherein said acyl-donor comprises an N-acyl donor having general formula:
R 1 —CO—L
where L is a leaving group bonded to a carbonyl carbon through a nitrogen atom.
4. A system as claimed in claim 3 , wherein said acyl-donor comprises an O-acyl donor having general formula:
R 1 —CO—L
where L is a leaving group bonded to a carbonyl carbon through an oxygen atom.
5. A system as claimed in claim 2 , wherein said acyl-donor is selected from the group consisting of acetyl salicylic acid, N-acetoxysuccinimide, N-acetylsuccinimide, N-acetylcaprolactam, N,N, N,N-tetraacetykethylethyldiamine (TAED), N,N, N-triacetylethylenediamine and acetylated sugars.
6. A system as claimed in claim 1 , wherein the amount of said acyl donating group is in the range from 0.01% to 100.00% as a function of the percentage w/w of peroxide to be obtained, and of the quantitative ratio of said second reactant to said first reactant.
7. A system as claimed in claim 1 , wherein said first reactant comprises at least one solvent or dispersant, when in the liquid state.
8. A system as claimed in claim 7 , wherein said solvent comprises a branched chain alcohol.
9. A system as claimed in claim 8 , wherein said branched chain alcohol is selected from higher C 5 –C 18 alcohols and lower C 1 –C 4 alcohols.
10. A system as claimed in claim 7 , wherein the amount of said at least one solvent or dispersant is in the range from 5.00% w/w to 50.00% w/w.
11. A system as claimed in claim 1 , wherein said activator comprises a dye that withstands the bleaching action of peroxyacids to act as a visual indicator of completed mixing of said first reactant with said second reactant throughout the stability duration of the system.
12. A system as claimed in claim 1 , wherein either said first reactant, when in the liquid state, or said second reactant, comprises a non-ionic surfactant and/or a solvating agent.
13. A system as claimed in claim 12 , wherein the amount of non-ionic surfactant component and/or solvating agent is proportional to the amount of acyl donor to be dispersed in said second reactant.
14. A system as claimed in claim 13 , wherein the concentration of said non-ionic surfactant is in the range from 0.0001% w/w and 5.00% w/w.
15. A system as claimed in claim 13 , wherein said non-ionic surfactant is from the group consisting of ethoxylated alcohol, and a Tween-sorbitan monolaurate, monooleate, monostearate polyethoxylate having an HLB value higher than 7.
16. A system as claimed in claim 13 , wherein said solvating agent comprises a glycol ether.
17. A system as claimed in claim 16 , wherein said glycol ether is selected from the group consisting of hexylene glycol, diethylene glycol monohexyl ether, and tripropylene glycol methyl ether.
18. A system as claimed in claim 16 , wherein the concentration of said glycol ether is in the range from 0.0001% w/w and 5.00% w/w.
19. A system as claimed in claim 1 , wherein said peroxide anion source within said second reactant comprises hydrogen peroxide (H 2 O 2 ) in an amount in the range from 0.001% w/w to 60% w/w.
20. A system as claimed in claim 1 , wherein the concentration of said biocidal agent is in the range from 5.00% w/w to 70.00% w/w.
21. A system as claimed in claim 1 , wherein said stabilizing buffer component comprises at least a phosphate or a phosphonate compound.
22. A system as claimed in claim 21 , wherein the amount of said phosphate and/or phosphonate compound is in the range from 0.001% w/w and 20.00% w/w.
23. A system as claimed in claim 21 , wherein the amount of said phosphate and/or phosphonate compound is such that said second reactant is kept at a pH above 6.5.
24. A system as claimed in claim 1 , wherein said stabilizing buffer component is responsible for lowering pH of the solution obtained down to a minimum pH 3.00.
25. A system as claimed in claim 1 , wherein the mixing temperature is lower than 25° C.
26. A system as claimed in claim 23 , wherein the second reactant is kept at a pH of 7.0.
27. A system as claimed in claim 1 , wherein the pH of the solution is lowered to a minimum of pH 4.5.