Electronic Grade Hydrogen Peroxide Purification Process

The production of hydrogen peroxide by anthraquinone method mainly includes four processes: hydrogenation, oxidation, extraction, and purification. In the production process, alkyl anthraquinone is mixed with organic solvents (heavy aromatic hydrocarbons, trioctyl phosphate) to form a working solution. Under the conditions of pressure of 0.30 MPa, temperature of 55-65 ℃, and catalyst presence, hydrogen gas is introduced for hydrogenation, and then it is counter oxidized with air (or oxygen) at 40-44 ℃. After extraction (pure water), regeneration, refining, and concentration, a hydrogen peroxide solution product with a mass fraction of 20% -30% is obtained.

Among them, the hydrogenated clay bed and the post-treatment clay bed are filled with a large number of active alumina balls. The function of the hydrogenated clay bed is mainly to reduce the degradation products of epoxy anthraquinone in the hydrogenation solution into effective anthraquinone. The function of the post-treatment clay bed is to regenerate the anthraquinone degradation products generated by the hydrogenation reaction and adsorb the potassium carbonate solution and water carried in the working solution, and decompose the residual hydrogen peroxide. Therefore, the active alumina balls in the hydrogenated clay bed and the post-treatment clay bed need to be replaced regularly to ensure stable production.

After the hydrogenated clay bed or post-treatment clay bed is stopped, the working fluid inside should be discharged first, and then steam should be used for blowing to clean the working fluid adsorbed by the alumina balls. The alumina balls can only be discharged after cooling down.

These steam blowing processes generate a large amount of wastewater, accounting for over 60% of the entire hydrogen peroxide industrial wastewater. This type of wastewater often has a COD of tens of thousands, making it extremely difficult to treat. Using conventional methods not only makes it difficult to reduce the COD of the wastewater to a qualified level, but also incurs high operating costs and waste of working fluid.

At present, the treatment of hydrogen peroxide wastewater generally adopts the process of gravity oil separation, catalytic oxidation, flocculation, and precipitation separation. This process uses hydrogen peroxide catalytic oxidation flocculation method (Fenton method) to treat wastewater, with intermittent operation. The mass concentration of COD in the effluent generally exceeds 300mg/L.

Due to the intermittent operation, the proficiency and technical level of the operators have a significant impact on the treatment process. After treatment, the wastewater indicators fluctuate greatly, making it difficult to achieve standard discharge or to use catalytic oxidation and biological treatment after oil removal.

The basic principle of the Haipu hydrogen peroxide purification device is to use the adsorption performance of special adsorption materials to adsorb and enrich organic matter in the hydrogen peroxide solution into the adsorption material. The TOC content of the adsorbed water is reduced to below 50mg/L, meeting the purification requirements of the hydrogen peroxide solution.

After adsorption saturation, the adsorbent material is subjected to desorption treatment to regenerate and reuse it for adsorption, and this cycle continues continuously.

Figure 1 Schematic diagram of wastewater adsorption and desorption