مرجع مواد شیمیایی ایران
اطلاعات عمومی تترا پتاسیم پیروفسفات
  • نام شیمیایی

    • تترا پتاسیم پیروفسفات

    • Tetrapotassium pyrophosphate

  • مترادف ها
    •  پیروفسفات پتاسیم

  • CAS
    7320-34-5
  • فرمول مولکولی
    K4O7P2
  • جرم مولکولی
    330/336
  • EINECS
    230-785-7
  • ICB Number
    ICB 4319
تترا پتاسیم پیروفسفات
  • شکل و حالت فیزیکی
    پودر کریستالی سفید
  • نقطه ذوب
    1090 °C
  • حلالیت در آب
    محلول در آب
  • شماره CAS
    7320-34-5
  • شماره مرک (Merck)
    14,7663
  • Chemical Properties
    • White crystalline powder

  • General Description
    • پتاسیم پیروفسفات بلورهایی بی رنگ و محلول در آب که در آبکاری قلع، خالص سازی خاک چینی، رنگرزی، خمیرهای حفاری نفت و سنتز محصولات لاستیکی به کار می رود.

    • Potassium tetrapyro phosphate is a whitish-colored powdered solid dissolved in an organic solvent. Potassium pyrophosphate may be toxic by ingestion. Contact with the substance should be avoided. The solvent may be flammable.

  • Air & Water Reactions
    • Soluble in water.

  • Reactivity Profile

    Salts, basic, such as POTASSIUM TETRAPYRO PHOSPHATE, are generally soluble in water. The resulting solutions contain moderate concentrations of hydroxide ions and have pH's greater than 7.0. They react as bases to neutralize acids. These neutralizations generate heat, but less or far less than is generated by neutralization of the bases in reactivity group 10 (Bases) and the neutralization of amines. They usually do not react as either oxidizing agents or reducing agents but such behavior is not impossible.

  • Synthesis
    • 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.

  • Usage
    • 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.

  • Health Hazard

    Highly toxic, may be fatal if inhaled, swallowed or absorbed through skin. Avoid any skin contact. Effects of contact or inhalation may be delayed. Fire may produce irritating, corrosive and/or toxic gases. Runoff from fire control or dilution water may be corrosive and/or toxic and cause pollution.

  • Fire Hazard

    Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive and/or toxic fumes. Containers may explode when heated. Runoff may pollute waterways.

  • Raw materials

    Potassium carbonate-->Potassium hydroxide -->Phosphorous acid-->Potassium hydroxide solution-->Specialindicatorpaper -->SILVER PHOSPHATE