TH7911B - Purification of hydrogen peroxide - Google Patents

Abstract

The electronics industry requires industrial use of hydrogen peroxide. is purified to a very low level of impurities that are currently used for impurity Some are at a few parts per billion (ppb) or even lower. However, existing methods may be unsafe in nature as they require hydrogenation. Concentrated peroxide comes in contact with a concentrate containing hydrogen peroxide solution. of transition metals and purification resins that function as carbon sources or are can achieve the desired level of purity In the process of this invention hydrogen peroxide solution It is carried through a very small pore membrane containing a cation exchange resin that can be removed. alkaline or alkaline metal ions Earth can leave the solution. The infused solution has the characteristics Specifically, it is a solution containing a metal that catalyzes the decomposition of hydrogen peroxide in volume. Not more than a small ratio by weight compared to the total metal content. In the process, the model of the solution fed is obtained by treating a solution containing iron or copper. adulterated by stannic oxide suspension before

Claims (19)

1. The process of refining an impure aqueous hydrogen peroxide solution where the impure solution contains an excess amount of positively charged non-transition metal ions compared to the positively charged transition metal ions. This process involves passing the impure solution through a thin membrane made of ion-exchange resin particles, specifically in the form of hydrogen. 2. The process under claim 1, where the total amount of such transition metal is not more than 20 percent by weight/weight of the total weight of all cationic ions in solution. 3. A process under claim 1 or claim 2 where the total concentration of transition metal cations is no more than 20 parts per million and the total concentration of non-transition metal cations is between 50 and 150 parts per billion. 4. The process under claim 1 involves the partial embedding of the cationic ion exchange resin within the membrane. 5. The process under claim 1 or claim 4, whereby such membrane consists of a material that is chemically inert to hydrogen peroxide and the pore diameter as specified is less than 1 micron. 6. The process under claim 5, whereby this thin membrane consists of polytetrafluoroethylene and has a pore size as specified in the range of 0.1 to 0.5 microns. 7. The process under claim 1, whereby the cationic ion exchange resin contains a strong acid. 8. The process under claim 7, whereby the said strong acid cationic exchange resin consists of a polystyrene divinylbenzene resin with a sulfonic acid substituent. 9. The process under claim 1, whereby the passage procedure involves the successive passing of the impure solution through a thin membrane containing resin. 10. The process under claim 1, where an impure aqueous peroxide solution containing a low proportion of transition metal cations is prepared by primarily reacting a hydrogen peroxide solution containing a higher proportion of transition metal cations with a stannic oxide dispersant. 11. Claim Verification Process 10, whereby the stannic oxide dispersion agent described in the preliminary procedure can be prepared by placing a suspension of stannic oxide particles in an aqueous fluid under high shear conditions. 12. The process under claim 10 or claim 11, where stannic oxide particles are present as a suspension in a hydrogen peroxide solution, and these stannic oxide particles are filtered out during the passage of an impure hydrogen peroxide solution through a resin-containing membrane, and positive ions are exchanged. 13. The process under claim 1 involves the embedding of a polystyrene divinylbenzene resin with sulfonic acid substituents within a thin membrane composed of polytetrafluoroethylene, with pore sizes ranging from 0.1 to 0.5 microns. 14. The process pursuant to claim 1 or claim 13, whereby such thin membrane is installed transversely and firmly within the side walls of the molten container. 15. The process pursuant to claim 14, whereby the side walls of this container are made of opaque plastic material. 16. The process under claim 15, whereby the opaque plastic material consists of high-density polyethylene. 17. The process under claim 14 where the container has an inlet port that is fitted to or accepts the outlet port of an impure hydrogen peroxide solution. 18. The process according to claim 14, where the side wall of this container is cylindrical in shape. 19. The process according to claim 14, where the side walls of the packing tube have a void defined by a double-layered membrane which contains cationic ion-exchange resin particles.