Potassium pyrophosphate

Base Information

• Chemical Name: Potassium pyrophosphate
• CAS No.: 7320-34-5
• Deprecated CAS: 1174512-44-7,1269628-81-0,2223678-13-3,1269628-81-0
• Molecular Formula: K4O7P2
• Molecular Weight: 330.34
• Hs Code.: 28353990
• European Community (EC) Number: 230-785-7,233-338-4
• ICSC Number: 0983
• UN Number: 3288
• UNII: B9W4019H5G
• DSSTox Substance ID: DTXSID3036446
• Nikkaji Number: J9.215K
• Wikidata: Q2575439
• RXCUI: 1426658
• Mol file: 7320-34-5.mol

Synonyms:tetrapotassium pyrophosphate

Chemical Property of Potassium pyrophosphate

Chemical Property:

• Appearance/Colour: White crystalline powder
• Vapor Pressure: 0Pa at 20℃
• Melting Point: 1109oC
• Boiling Point: >1500
• PSA: 155.23000
• Density: 2.534
• LogP: 0.94120
• Sensitive.: Hygroscopic
• Water Solubility.: SOLUBLE
• Hydrogen Bond Donor Count: 0
• Hydrogen Bond Acceptor Count: 7
• Rotatable Bond Count: 0
• Exact Mass: 329.7667523
• Heavy Atom Count: 13
• Complexity: 124
• Transport DOT Label: Poison

Purity/Quality:

99% ^*data from raw suppliers

Potassium pyrophosphate ^*data from reagent suppliers

Safty Information:

• Pictogram(s): Xi
• Hazard Codes: Xi
• Statements: 36/37/38-36
• Safety Statements: 26-36-22

MSDS Files:

SDS file from LookChem

Total 1 MSDS from other Authors

Useful:

• Chemical Classes: Metals -> Phosphates, Metallic Salts
• Canonical SMILES: [O-]P(=O)([O-])OP(=O)([O-])[O-].[K+].[K+].[K+].[K+]
• Inhalation Risk: Evaporation at 20 °C is negligible; a harmful concentration of airborne particles can, however, be reached quickly , especially if powdered.
• Effects of Short Term Exposure: The substance is corrosive to the eyes, skin and respiratory tract. Corrosive on ingestion. Inhalation of the aerosol may cause lung oedema.
• Uses: It is mainly for applied to non-cyanide electroplating for being used as the complexing agent for replacement of sodium cyanide. It is also be used as a plating pretreatment agent and pyrophosphate plating solution. It can also be used as the components for formulation of clothing detergent, metal surface cleaning agent and bottle detergent as well as the additive used in various kinds of detergents. It can also be used as the clay dispersant in the field of the ceramic industry, the dispersant and buffer for pigment and dye. Bleaching and dyeing industry can use it for the removal of the small amount of ferric ion in water for improving the quality of dyeing. It can be used for non-cyanide electroplating, dyeing, refining clay and other. It can be used as analysis agent, the stabilizer of hydrogen peroxide as well as the filler of soap. It is used as an emulsifier, texturizing agent, and chelating agent in the food industry. It can also be used as the raw material for preparation of pasta-purpose alkaline water. t is commonly used for preventing the generation of struvite in canned fish, preventing the discoloration of canned fruit, increasing the swelling degree of ice cream, the extracting amount of the raw materials of coffee as well as the yield of ham and sausage, enhancing the water holding capacity of fish, improving the taste and yield of noodles, and preventing the aging of cheese. Soap and detergent builder, sequestering agent, peptizing and dispersing agent. Potassium pyrophosphate is mainly used as an emulsifier, quality improver and metal ion chelating agent. It can be found in herbicidal compositions as a spray adjuvant. It is also used as an anionic dispersant in water-based (latex) paints.
• Production method: 1. The neutralization and calcination method( the ratio of usage amount of raw materials is 1 mol of phosphate and 2 mol of potassium hydroxide): add 30% food-grade phosphoric acid into the neutralizer and the slowly stir and add food grade potassium hydroxide solution for neutralizing reaction for which the pH is suitable for maintained at 8.4; Heat the solution after the completion of the reaction and further add active carbon for decolorization; filter to remove the insoluble matters and the clarified filtrate was further heated to 120~124 ℃ for evaporative concentration; the precipitate will be separated out after cooling to below 20 ℃; centrifuge for separation to obtain trihydrate-di-potassium phosphate and heat to 120~130 ℃ for removing crystal water to generate anhydrous di-potassium hydrogen phosphate; add it to a calciner for being calcined at 500~600 ℃ for polymerization and the edible potassium pyrophosphate is obtained after cooling. The reaction process is as following: H3PO4 + 2KOH → K2HPO4 + 2H2O 2K2HPO4 [△] → K4P2O7 + H2O Have the resulting finished products of potassium pyrophosphate reacted with 0.1 mol/L silver nitrate, and when the reaction solution yields no orthophosphate precipitate of yellow color, the product is qualified. 2. Put 203 kg of potassium hydroxide into the dissolving tank; add water to generate a 48% aqueous potassium hydroxide solution. Put it into the kettle and stir and slowly add drop wise of 85% phosphoric acid for salting reaction. When the added phosphoric acid reaches 100 kg, take one drop of liquid material and add to the white porcelain plate; further add 1 drop of water for dilution and measure the pH using accurate test paper. Stop dropping phosphoric acid when the pH reaches 8.5 to 9.0. Continue for stirring for 0.5 h, stand, and remove the impurities by filtration. The filtrate was then transferred to vaporize pan for concentration; after reaching the glue dry state, it was further transferred to a coking furnace and subject to coking process at 550~650 ℃. After 2 to 3 hour of coking, sampling for measuring the end point (check with 1% silver nitrate solution to until no yellow silver orthophosphate appears). After the completion of the reaction, cool, crystallize to obtain the finished products.