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Potassium pyrophosphate (Potassium pyrophosphate)

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Potassium pyrophosphate

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Tetrapotassium Pyrophosphate Anhydrous
TKPP

7320-34-5

K4O7P2

330.33

2835399000

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Nature Description

Density 2.534
Boiling point> 1500
Melting point 1109°C
Molecular formula K4O7P2
Molecular weight 330.336
Accurate quality 329.766754
PSA 155.23000
LogP 0.94120
Appearance: white powder or block. Relative density 2.534. Melting point ℃. Soluble in water, insoluble in ethanol. The aqueous solution is alkaline. The solubility of 100g water at 25℃ is 187g. The pH of the aqueous solution with a concentration of 1% is 10.2. Potassium pyrophosphate has all the properties of other condensed phosphates.

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Product Applications

[Purpose 1]]
used for cyanide-free electroplating, dyeing, refining pottery clay, etc.

[Purpose 2]]
used as analytical reagent, hydrogen peroxide stabilizer and soap filler
[Purpose 3]]
it is mainly used for cyanide-free electroplating, instead of sodium cyanide as complexing agent for electroplating. It is also used as a pre-treatment agent for electroplating and pyrophosphate electroplating solution. Prepare dress material detergent components, metal surface cleaning agents, bottle detergent components and additives of various cleaning agents. It is used as Clay dispersant, pigment and dye dispersant and buffer in ceramic industry. The bleaching and dyeing industry is used to remove a small amount of trivalent iron ions in water and improve the bleaching and dyeing quality.
[Purpose 4]]
in the food industry, it is used as emulsifier, tissue modifier, chelating agent, and also as raw material of alkaline water for flour product. Combined with other condensed phosphates, it is usually used to prevent the production of bird droppings in canned aquatic products and prevent the discoloration of canned fruits; Improve the expansion degree of ice cream, the yield of ham and sausage, and the water retention of ground fish meat; improve noodle taste and yield, prevent cheese aging, etc.
[Purpose 5]]
analytical reagent, hydrogen peroxide stabilizer, electroplating, soap filler.

Production method

Preparation Method of potassium pyrophosphate (7320-34-5): This product is made of hydrogen phosphate · dipotassium phosphate from aqueous solution of phosphoric acid and caustic potassium (potassium g phosphorus = 2:1), dehydrated, crystallized after baking to 350 ℃, crushed, it is heated at 400 ~ 500℃ for 12 hours. Limited: 1.GB 2760-96: meat products 1g/kg; Fruit and vegetable peeling GMP. 2. Fao/ WHO(1984,g/kg): ready-to-eat broth and soup, whose total phosphate is 1000 mg/kg (calculated as p205); Processed cheese whose total phosphate is 9 (calculated as phosphorus); luncheon Meat 3 (based on p205); Quick-frozen perch, flounder, Atlantic cod, haddock, hake, shrimp or prawn 5 (based on p205); Cooked pig fore Hock, cooked ham, cooked minced meat 3 (based on anhydrous matter). Distinguishing test: 1. Soluble in water, insoluble in ethanol (OT-42) method. 2. Take 1% of sample solution 1ml and add several drops of silver nitrate test solution (TS-210) to produce white precipitate, which is dissolved in dilute nitric acid test solution (TS-158). The Halo-sylvite test (IT-27) of 3.5% sample solution was positive. The pH value of 4.1% aqueous solution is 10.0~10.7. 5. Take 100mg sample and dissolve in 100ml dilute nitric acid test solution (TS-158). Take 0.5ml of this solution and add it to 30ml quinmo lime Ketone Test Solution (TS-202) without yellow precipitation. Heat the remaining sample solution at 95℃ for 10min, take 0.5ml of this solution, and add it to 30ml quinmo lime Ketone Test Solution. Yellow precipitate should be formed immediately. Content analysis: Accurately weigh the sample about 600mg, dissolve in 100ml water in 400ml beaker, and adjust the pH value of the solution to 3.8 accurately with hydrochloric acid and pH meter. Add 12.5% zinc sulfate solution (125g znso4.7h2o dissolved in water, diluted to 1000ml, filtered, adjusted to pH3.8)50ml, and place for 2min. The free acid was titrated with 0.1mol/L sodium hydroxide to pH 3.8. When approaching the end point, each time sodium hydroxide is added, the precipitated zinc hydroxide should wait for redissolving. 0.1 mol/L sodium hydroxide per mL is equivalent to 16.52mg of potassium pyrophosphate (K4P2O7). Quality Index analysis: Ignition weight loss: measured according to GT-20 method, the condition is burning 30rnin at 550℃, and then drying at 105℃ for 4 hours. The condition of FCC is burning at ℃ for 30min.

Security

Dangerous Goods Marking： Xi

Safety instructions： S26: in case of contact with eyes, rinse with plenty of water immediately and send it to the doctor for diagnosis and treatment. S36: Wear a suitable protective clothes.

Hazardous material category code： R36/37/38: it can irritate eyes, respiratory tract and skin.

Symbols： GHS07

Storage conditions： 1. It should be stored in a ventilated and dry warehouse. 2. It cannot be stored and mixed with acid articles. Anti-rain and sun exposure, moisture-proof.

Cautionary Statement： P305+P351+P338

Signal word： Warning

Hazard Statement： H319