Potassium monopersulfate solutions
View Patent ↗A composition comprising a solution of potassium monopersulfate having an active oxygen content of from about 3.4% to about 6.8% and a process for its preparation including neutralization with an alkaline material is disclosed.
1. A composition comprising a stable solution of potassium monopersulfate having an active oxygen content of from about 3.5% to about 6.8% by weight and a maximum SO 4 content of about 5.5% by weight.
2. The composition of claim 1 having an active oxygen content of from about 3.6% to about 6.8% by weight.
3. A composition comprised of claim 1 having a maximum SO 4 content of 5.0% by weight.
4. The composition of claim 3 having a pH of from about 0.4 to about 1.5.
5. The composition of claim 1 further comprising an adjuvant selected from the group consisting of a mineral acid other than hydrochloric acid, a C 1 to C 4 organic acid, a surfactant, a stabilizer, and an etch rate modifier.
6. A process for the preparation of a solution of potassium monopersulfate having an active oxygen content of from about 3.5% to about 6.8% by weight and a maximum SO 4 content of about 5.5% by weight comprising a) mixing to form an equilibrated slurry: i) solid 2KHSO 5 .KHSO 4 .K 2 SO 4 , ii) a quantity of water insufficient to completely dissolve the solid, and iii) an alkaline material; and b) separating undissolved solids to obtain a stable solution.
7. The process of claim 6 wherein the alkaline material is added after the solid 2KHSO 5 .KHSO 4 .·K 2 SO 4 and water have been mixed.
8. The process of claim 6 wherein the alkaline material is selected from the group consisting of sodium hydroxide, potassium hydroxide, barium hydroxide, magnesium hydroxide, sodium carbonate, potassium carbonate, sodium bicarbonate or potassium bicarbonate.
9. The process of claim 6 wherein from about 25 g to about 70 g of water is employed per 100 g of 2KHSO 5 .KHSO 4 .K 2 SO 4 .
10. The process of claim 6 wherein during the addition of the alkaline material a temperature at or below 40° C. is maintained.
11. The process of claim 6 wherein the water is deionized water.
12. The process of claim 6 wherein the active oxygen content of the solution obtained is from about 3.6% to about 6.8% by weight.
13. The process of claim 6 further comprising, after separating undissolved solids, adding an adjuvant selected from the group consisting of a mineral acid other than hydrochloric acid, a C 1 to C 4 organic acid, a surfactant, a stabilizer, and an etch rate modifier.
14. The process of claim 6 further comprising adding acid to the solution obtained to adjust the pH to a range of from about 0.4 to about 1.5.