Sodium perborate tetrahydrate|10486-00-7

Sodium perborate tetrahydrate has the CAS number 10486-00-7 and the molecular formula is NaBO₃.4H₂O. It has an active oxygen content of 10%. Its aqueous solution is weakly alkaline with a pH of 10-11. It is a weak oxidant and releases oxygen when in contact with water. Sodium perborate tetrahydrate decomposes rapidly above 60℃, and its solubility increases rapidly. It is widely used in industries such as laundry, detergents, aquaculture, bleaching, and disinfectants. Different temperatures, pH values, metal ions, catalysts, and formulations may affect the oxidative properties of sodium perborate tetrahydrate.

Basic Information

English Name: Sodium Perborate Tetrahydrate, Sodium Perborate, Sodium Peroxyborate

Molecular Formula: NaBO3.4H2O

Molecular Weight: 153.86

CAS Number: 10486-00-7

EINECS Number: 239-172-9 Density (254℃): 1.73 g/mL

Melting Point: 63.0℃

Export Tax Rebate: 0

Hazard Category: General Goods

Product Specifications

Active Oxygen, %≥10.0

Main Content, %≥96

pH: 9.9-10.9

Iron, %≤0.0015

Bulk Density, g/L: 500-850

Wet Stability, %≥ 82

Mechanism of Action

The oxidation mechanism of sodium perborate tetrahydrate is similar to that of hydrogen peroxide, but not identical. The perboric acid it contains can also oxidize materials. Its oxidizing ability is enhanced in the presence of catalysts such as metal ions. When in contact with water, hydrogen peroxide is released, and the oxidation reaction is: H2O2+ 2e− + 2H+ → 2H2O (E₂ = +1.76 V). In the presence of transition metal ions (such as Fe⁺ and Cu⁺) or in the presence of light, hydrogen peroxide H2O2 undergoes homolytic cleavage to produce highly reactive hydroxyl radicals (·OH): H2O2(catalyst Fe⁺) → OH− + ⋅OH. The large amount of hydroxyl radicals produced has extremely strong oxidizing power (E°≈+2.8 V), capable of non-selectively oxidizing organic compounds (such as dyes and pollutants). In the presence of catalysts, their oxidation charge is nearly 64% higher than that in aqueous solution.

Precautions

Do not store sodium perborate tetrahydrate with strong oxidants, reducing agents, strong acids, or strong bases, as this can easily lead to decomposition. Keep the warehouse as dry as possible; excessive humidity may cause decomposition.

Production and Preparation

After dissolving sodium hydroxide, mix it with borax solution and adjust the solution concentration to 26 with concentrated mother liquor. After thorough stirring, remove insoluble matter by filtration to obtain a sodium metaborate solution. This solution is then pumped into a reactor. The solution is adjusted to an appropriate concentration with the mother liquor and stabilized with magnesium silicate. Then, hydrogen peroxide is added, controlling the flow rate of hydrogen peroxide. The reaction is carried out at a temperature not exceeding 35℃. After the reaction is complete, cool and crystallize, centrifuge, and dry to obtain the finished sodium perborate.

Packaging

25 kg/bag

Sodium perborate tetrahydrate can act directly as an oxidant under acidic or high-temperature conditions. Its active oxygen (O²⁻) is transferred to the substrate, playing an important role in the epoxidation of olefins and the oxidation of thioethers to sulfoxides. Its oxidizing power is stronger in acidic conditions than in alkaline conditions, and it can destroy chromophores in oil, tea, and sweat stains during washing. The essential principle of sodium perborate tetrahydrate's oxidation is to indirectly provide hydrogen peroxide, which then generates active oxygen species through homolytic or heterolytic cleavage. Its mildness, controllability, and solid-state stability make it widely used in cleaning, synthesis, and environmental protection. In actual use, reaction conditions may vary dynamically due to pH, temperature, catalyst, and other factors.

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