7727-21-1
Potassium persulfate
CAS: 7727-21-1
Molecular Formula: K2O8S2
7727-21-1 - Names and Identifiers
| Name | Potassium persulfate |
| Synonyms | anthion BETZ 2701 NP A SOLUTION Potassium persulfate POTASSIUM PERSULFATE Potassium persulphate dipotassiumpersulfate Potassium peroxodisulfate POTASSIUM PEROXODISULFATE Potassium peroxydisulfate POTASSIUM PEROXYDISULFATE POTASSIUM PEROXYDISULPHATE DIPOTASSIUM PEROXYDISULFATE dipotassium peroxodisulphate DI-POTASSIUM PEROXODISULPHATE POTASSIUM PERSULFATE, PURIFIED TNP-201 DECOMPOSITION SOLUTION 1 Peroxydisulfuricacid,dipotassiumsalt dipotassium [(sulfonatoperoxy)sulfonyl]oxidanide peroxydisulfuricacid([(ho)s(o)2]2o2),dipotassiumsalt Peroxydisulphuric acid dipotassium salt~Potassium peroxydisulphate |
| CAS | 7727-21-1 |
| EINECS | 231-781-8 |
| InChI | InChI=1/2K.H2O8S2/c;;1-7-10(5,6)8-9(2,3)4/h;;1H,(H,2,3,4)/q2*+1;/p-2 |
| InChIKey | USHAGKDGDHPEEY-UHFFFAOYSA-L |
7727-21-1 - Physico-chemical Properties
| Molecular Formula | K2O8S2 |
| Molar Mass | 270.32 |
| Density | 2.47 |
| Melting Point | 1067 °C |
| Boling Point | 1689 °C |
| Water Solubility | 5 g/100 mL (20 ºC) |
| Solubility | H2O: 0.5M at20°C, clear, colorless |
| Vapor Presure | 0Pa at 25℃ |
| Vapor Density | 9.3 (vs air) |
| Appearance | Solid |
| Specific Gravity | 2.477 |
| Color | White |
| Odor | Odorless |
| Exposure Limit | ACGIH: TWA 0.1 mg/m3 |
| Merck | 14,7656 |
| PH | 3.2 (50g/l, H2O, 20℃) |
| Storage Condition | Store at +5°C to +30°C. |
| Stability | Stable. Strong oxidizer. Incompatible with strong reducing agents, organic materials, combustible materials. |
| Physical and Chemical Properties | Properties colorless or white triclinic crystal powder. relative density 2.477 solubility: soluble in water, solubility: 1.75g/100ml water at 0 ℃, solubility: 5.3g/100ml water at 20 ℃. Insoluble in alcohol. The aqueous solution was acidic. |
| Use | Used as initiator, bleach, oxidant, etc |
7727-21-1 - Risk and Safety
| Risk Codes | R8 - Contact with combustible material may cause fire R22 - Harmful if swallowed R36/37/38 - Irritating to eyes, respiratory system and skin. R42/43 - May cause sensitization by inhalation and skin contact. |
| Safety Description | S22 - Do not breathe dust. S24 - Avoid contact with skin. S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S37 - Wear suitable gloves. |
| UN IDs | UN 1492 5.1/PG 3 |
| WGK Germany | 1 |
| RTECS | TT5900000 |
| TSCA | Yes |
| HS Code | 2833 40 00 |
| Hazard Class | 5.1 |
| Packing Group | III |
| Toxicity | LD50 orally in Rabbit: 802 mg/kg |
7727-21-1 - Upstream Downstream Industry
| Raw Materials | Ammonium persulfate Sulfuric acid Ammonium sulfate Potassium Sulphate |
| Downstream Products | Potassium persulfate |
7727-21-1 - Nature
Open Data Verified Data
colorless or white crystals. No odor. d2. 477. Soluble in about 50 parts of water, 25 parts of 40 deg C water, aqueous solution is acidic. Insoluble in ethanol. The gradual decomposition in air releases oxygen, and the decomposition is faster at high temperature, and the total decomposition is at 100. Risk of combustion explosion when contacted or mixed with organic matter, reducing agents, and combustible materials. Explosion can occur when heated sharply.
Last Update：2024-01-02 23:10:35
7727-21-1 - Preparation Method
Open Data Verified Data
ammonium persulfate was dissolved in water, and potassium hydroxide solution was added. The mixture was heated under aeration until ammonia was depleted. After cooling, Suction filtration crystallization, washing, drying to obtain potassium peroxodisulfate.
Last Update：2022-01-01 09:02:55
7727-21-1 - Use
Open Data Verified Data
It is used as an analytical reagent for the determination of manganese content in steel analysis; It is also used as a disinfectant, a fabric bleaching agent, a sodium thiosulfate remover and a deodorizing agent; It is used as an oxidant for dyes and inorganic salts in chemical reactions; it is used as an initiator for elastomer in synthetic rubber; It is used as an accelerator for polyvinyl chloride emulsion polymerization in the production of synthetic resin; And it is also a raw material for the preparation of hydrogen peroxide.
Last Update：2022-01-01 09:02:56
7727-21-1 - Safety
Open Data Verified Data
rat oral LDso:802mg/kg. Inhalation of this substance dust is irritating to the nose, throat and respiratory tract, causing Cough and chest discomfort. Eye irritation. Staff should be well protected, if accidentally touch the eyes, should immediately rinse with a large amount of flowing water. The working environment should have good ventilation conditions. Store in a cool, dry and ventilated place. Keep away from fire and heat source. Protection from direct sunlight. Keep the container sealed. Should be stored separately from flammable, combustible materials, reducing agents, etc.
Last Update：2022-01-01 09:02:56
7727-21-1 - Reference Information
| pH range of acid-base indicator discoloration | 2.5 - 4.5 |
| LogP | -1 at 20℃ |
| EPA chemical substance information | information provided by: ofmpeb.epa.gov (external link) |
| Overview | potassium persulfate (formula K2S2O8), also known as high potassium sulfate, molecular weight: 270.32, decomposition temperature: 50-60 ℃, is a white, tasteless Crystal, soluble in water, insoluble in ethanol, with strong oxidation, commonly used as bleach, oxidant, it can also be used as a polymerization initiator, which hardly absorbs moisture, has good stability at room temperature, is convenient for storage, and has the advantages of convenience and safety. Applications include polymerization initiators, circuit board cleaning and etching, copper and aluminum surface activation, starch modification, low temperature bleaching and Desizing of pulp and fabrics, purification of circulating water systems, oxidative degradation of harmful gases, low formaldehyde adhesive adhesion acceleration, ethanol and aromatic hydrocarbon oxidation, disinfectant, hair dye decolorization. |
| half-life | 80 ℃-1.5 hours; 70 ℃-7.7 hours; 60 ℃-33 hours; 45 °c -292 hours; 35 °c -1600 hours. |
| recrystallization | potassium persulfate was dissolved in water at 30 °c and cooled to obtain a recrystallized product, which was filtered and dried under reduced pressure in the presence of calcium chloride. |
| solubility in water (g/100ml) | grams dissolved per 100ml of water: 4.7g/20 ℃ |
| Main application fields | potassium persulfate is mainly used for initiator and strong oxidant initiator: Potassium persulfate is latex or acrylic monomer polymerization liquid, vinyl acetate, the initiator of vinyl chloride and other products is also the initiator of the copolymerization of styrene, acrylonitrile, butadiene and Other colloids. Strong oxidants:(1) used as Desizing agent and bleach activator. (2) for the oxidation and degradation of harmful substances in water pool and closed cycle treatment. (3) is the production of starch regulator, and used in the production of adhesives and coatings. (4) for branched-chain oxidation, ethanol and aromatic hydroxyl oxidation. (5) is one of the basic components of the hair dye, the role of decolorization. |
| toxicity | not dosage specified (FAO/WHO,2001). potassium persulfate powder has a stimulating effect on the nasal mucosa, and the packaging room requires good ventilation to prevent dust from flying. Wear labor protection products at work. |
| precautions for storage and transportation | potassium persulfate is a non-flammable product, but it has a combustion-supporting effect due to the release of oxygen, the storage environment must be dry, clean and well ventilated. Pay attention to moisture and rain, rain is not suitable for transport. Should be kept away from fires, heat sources and direct sunlight. Keep the outer package sealed and the label intact and clear. It should be stored separately from flammable or combustible materials, organic matter, rust, a small amount of metal, and other reducing substances, and should not be mixed to prevent the decomposition and explosion of potassium persulfate. |
| Use | used as initiator, bleaching agent, oxidant, etc. wheat flour gluten agent. It is mainly used as disinfectant and fabric bleaching agent. Dyes and inorganic salts are industrially used as oxidants. The synthetic rubber industry is used as an initiator for emulsion polymerization. Synthetic resins are used as polymerization promoters. In addition, it is also used in iron and steel, photosensitive industry and medicine. used as analytical reagent, oxidant and plastic initiator, and also used in the printing of films |
| production method | The potassium sulfate method uses ammonium sulfate and sulfuric acid to prepare an electrolyte solution to remove impurities and then conduct electrolysis. HSO4-generates persulfate by discharge at the anode, and then reacts with ammonium sulfate to generate ammonium persulfate. Then, potassium sulfate is added for double decomposition reaction, and potassium persulfate is obtained by cooling, separation, crystallization and drying. Its anode reaction: 2HSO4-2e → H2S2O8 cathode reaction: 2h2e → H2 (NH4)2SO4 H2S2O8 →(NH4)2S2O8 H2SO4(NH4)2S2O8 K2SO4 H2SO4 → K2S2O8 2NH4HSO4 obtained by double decomposition reaction of ammonium persulfate and potassium sulfate, followed by cooling, separation, crystallization and drying. |
| category | oxidant |
| toxicity grade | poisoning |
| Acute toxicity | oral-rat LD50: 802 mg/kg |
| explosive hazard characteristics | can be mixed with reductant, sulfur, phosphorus, etc, open flame can be exploded |
| flammability hazard characteristics | thermal decomposition of oxygen; Toxic NOx smoke from combustion |
| storage and transportation characteristics | The warehouse is ventilated and dried at low temperature; Light loading and light unloading; With organic matter, reducing agent, sulfur, separate storage of phosphorus flammability |
| fire extinguishing agent | water, sand, foam |
| Occupational Standard | TWA 2 mg/m3 |
| toxic substance data | information provided by: pubchem.ncbi.nlm.nih.gov (external link) |
Last Update：2024-04-10 22:29:15
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