Hydrogen peroxide purification process and hydrogen peroxide
View Patent ↗A hydrogen peroxide purification process, including supplying a starting stream containing hydrogen peroxide at a content above 50 wt %, as well as at least one stabilizer; a single step of purification of the starting stream, the single step having purification by reverse osmosis; collecting a purified stream at the end of said single purification step, in which purification by reverse osmosis includes: passing the starting stream over a first membrane; collecting a permeate and a retentate from the first membrane; passing the permeate from the first membrane over a second membrane; collecting a permeate and a retentate from the second membrane, the purified stream having the permeate from the second membrane.
1. A hydrogen peroxide purification process, comprising:
supplying a starting stream, wherein the starting stream comprises hydrogen peroxide at a content above 50 wt %, and at least one stabilizer;
purifying the starting stream by reverse osmosis,
wherein the purifying consists essentially of:
passing the starting stream over a first membrane;
collecting a permeate and a retentate from the first membrane;
passing the permeate from the first membrane over a second membrane; and
collecting a permeate and a retentate from the second membrane, wherein the purified stream consists of the permeate from the second membrane, and
wherein the purification process excludes the presence of ion exchange steps.
2. The process as claimed in claim 1 , wherein the starting stream is prepared by a process comprising passing the starting stream over an adsorption resin.
3. The process of claim 1 , wherein the starting stream comprises at least 55 wt % of hydrogen peroxide.
4. The process of claim 1 , wherein the stabilizer is selected from phosphate or pyrophosphate salts, tin salts, organophosphorus compounds and phosphonates, carboxylic acids, borates, nitrates and combinations of the latter.
5. The process of claim 1 , wherein the first membrane is of the polyamide, polypiperazine, polyacrylonitrile or polysulfone type.
6. The process of claim 1 , wherein the purified stream comprises:
less than 100 mg/kg of total organic carbon;
less than 5 mg/kg of phosphorus;
less than 0.04 mg/kg of iron; and
less than 0.1 mg/kg of the sum of chromium and nickel.
7. The process of claim 1 , wherein the first membrane and the second membrane are used for greater than or equal to 1 week.
8. The process of claim 1 , wherein the purification process form a solution comprising at least 55 wt % of hydrogen peroxide, at least one stabilizer,
less than 100 mg/kg of total organic carbon;
less than 5 mg/kg of phosphorus;
less than 0.04 mg/kg of iron; and
less than 0.1 mg/kg of the sum of chromium and nickel.
9. The process of claim 8 , wherein the stabilizer is selected from phosphate or pyrophosphate salts, tin salts, organophosphorus compounds and phosphonates, carboxylic acids, borates, nitrates and combinations of the latter.
10. The process of claim 8 , wherein the content of stabilizer is between 5 and 50 mg per kg of solution.
11. The process of claim 1 , comprising supplying the starting stream directly from a hydrogen peroxide production unit.
12. The process of claim 11 , wherein the starting stream is passaged over an adsorption resin in the hydrogen peroxide production unit before being supplied to the hydrogen peroxide purification process.
13. The process of claim 1 , wherein the starting stream is passaged over an adsorption resin in a hydrogen peroxide production unit before being supplied to the hydrogen peroxide purification process.