مرجع مواد شیمیایی ایران
اطلاعات عمومی پتاسیم دی هیدروژن فسفات
  • نام شیمیایی

    • پتاسیم دی هیدروژن فسفات

    • Potassium dihydrogen phosphate

  • مترادف ها
    •  مونو پتاسیم فسفات

    • Monopotassium phosphate ; Potassium phosphate monobasic ; Phosphoric acid, monopotassium salt

  • CAS
    7778-77-0
  • فرمول مولکولی
    KH2PO4
  • جرم مولکولی
    136/09
  • EINECS
    231-913-4
  • ICB Number
    ICB 4249
پتاسیم دی هیدروژن فسفات
  • شکل و حالت فیزیکی
    پودر سفید
  • نقطه ذوب
    252/6 °C
  • دانسیته
    2/338 g/mL at 25 °C(lit.)
  • ضریب شکست (n20/D­­)
    1/4864
  • دمای نگهداری
    دمای اتاق
  • حلالیت در آب
    22/6 g/100 mL (20 °C)
  • اسیدیته (pka)
    6/86
  • بازیسیته (pkb)
    11/9
  • شماره CAS
    7778-77-0
  • شماره مرک (Merck)
    14,7659
  • EPA Substance Registry System
  • مراجع MSDS
  • ارائه دهنده
    زبان
  • انگلیسی
  • انگلیسی
  • Chemical Properties
    • White powder

  • Synthesis
    • (1) Industrial production methods include neutralization, metathesis, extraction, electrodialysis, ion exchange and so on. Double decomposition method: 30% sodium hydroxide solution was added to the reactor containing distilled water; slowly add 85% phosphoric acid for neutralization reaction under stirring to neutralize the solution to Ph4.1-4.3 to prepare sodium dihydrogen phosphate, Then add 90% potassium chloride to carry out metathesis reaction at about 100 °C and keep the temperature for half an hour to reach equilibrium; add arsenic removal agent and heavy metal removal agent to carry out solution purification, filtering and removing impurities such as arsenic and heavy metal, and cool the filtrate to room temperature; Add arsenic-removed phosphoric acid to adjust to Ph4.4-4.7, and adjust the relative density to 31-32Bé with water. After stirring for 30 min, the crystal is precipitated. After centrifuge separation, we can obtain the potassium dihydrogen phosphate product for feed. The reaction equation is as: NaH2PO4 + KCl → KH2PO4 + NaCl When the mother liquor is evaporated to 108 ~ 109 ℃, the liquid color turns from clarification to white to obtain the sodium chloride crystals; Filter to remove it with the filtrate returning to the process for further usage. (2) Caustic potash: the iron-removed caustic potash (About 30% KOH) was added into an enamel reactor with stirring and steam jacket; an appropriate amount of phosphoric acid (diluted to 50% H3PO4) was added slowly with stirring to carry out neutralization reaction. Maintain the reaction temperature at 85 to 100 ° C, control the Ph value at 4.2 to 4.6, and the relative density of the final solution is 1.32 to 1.33. Upon being evaporated concentration to the relative density of 1.38 to 1.42, it is further sent to the crystallization process with cooling to 36 °C for precipitation of crystal; followed by separation dehydration, washing, drying to obtain potassium dihydrogen phosphate system. The reaction equation is: KOH + H3PO4 → KH2PO4 + H2O Potassium chloride method: 95% potassium chloride is dissolved in 70 ~ 80 ℃ hot water, adjusted a nearly saturated solution, and added together with 75% phosphoric acid at a ratio of KCl: H3PO4 = 1: 1.2 into the reactor for neutralization reaction at 150 ~ 170 ℃, resulting in potassium dihydrogen phosphate and hydrogen chloride. Hydrochloric gas is recovered as hydrochloric acid by cooling. The reaction solution is added with dilute potassium hydroxide solution for neutralization, and the end point is controlled at about Ph4.4 to 4.6. After evaporation condensation, cooling crystallization, centrifuge separation and washing with water and drying to obtain potassium dihydrogen phosphate product. The reaction equation is: H3P04 + KCl → KH2PO4 + HCl ↑ The mother liquor contains a lot of potassium dihydrogen phosphate, potassium chloride and free acid. They can return the process for being as ingredients. (3) Neutralization method. It is obtained through the neutralization of the phosphoric acid and potassium hydroxide at calculated ratio: The caustic potash was formulated to a solution of relative density of 1.3 (ca 30%) and was neutralized with 50% phosphoric acid under constant stirring. The reaction temperature was maintained at 85-100 ° C and the final pH was controlled at 4.2-4.6 (Congo red paper was light purple). Neutralization liquid was concentrated to the relative density of 1.32-1.33 before filtration, and then cooled to below 36 °C for crystallization. After centrifugal separation, we can obtain the dry products. The mother liquor can then be recycled. Potassium phosphate can also be used, and the process is similar. KOH+H3PO4→KH2PO4+H2O (4) Phosphate metathesis method. The metathesis reaction was carried out with saturated potassium chloride solution with an excess amount of 75% phosphoric acid at 120-130 °C. The generated hydrogen chloride gas and water absorb byproduct acid. And then use potassium hydroxide to neutralize excess amount of phosphoric acid, reaching the final pH of 4.2-4.6; finally carry out cooling crystallization, centrifugal separation and drying to obtain the product with the mother liquor recycled. We can also produce feed-purpose potassium dihydrogen phosphate using hot phosphate (85) and agricultural potassium chloride as raw materials for going through decomposition, neutralization, defluorination and other steps. Take 49 g of agricultural KCL and dissolve in 100 mL water, add 1 g of KOH (industrial products) and pour into the flask after being completely dissolved. Concentrated to the quality of 124-117.5g and add 56.4 g phosphoric acid while hot. Pour into about 39 g of ammonium bicarbonate under stirring and adjust PH = 3.0-3.5. The precipitated crystals were filtered, rinsed with 10 mL of water and drained. The obtained potassium dihydrogen phosphate was dissolved in 100 Ml (2%) KOH solution and added of 2 g of SiO2 and a few drops of polyacrylamide and stirred for 20 min to form potassium fluorosilicate precipitate. Cool to 30°C and filter. Add proper amount of defluorination aid, calcium carbonate, stir for 10min, leading to the formation of calcium fluoride precipitate. The filtrate was concentrated and cooled to 35-40 ° C. The filtrate was then washed back to pH 4.4-4.7 with phosphoric acid, filtered and dried.

  • Usage
    • (1) As feed phosphorus additives; In the food industry, it is used for the manufacture of baked goods, for leavening agent, flavoring agent, fermentation additives, nutritional fortifiers, yeast food. Also used as a buffer, chelating agent. (2) It can be used as fertilizer, flavoring agent and the culture agent of brewing yeast; used for the preparation of buffer solution, also used in medicine and manufacturing of potassium metaphosphate. (3) It can be used for the fertilization of rice, wheat, cotton, rape, tobacco, sugar cane, apple and other crops. (4) It can be used as chromatography reagents and buffer, but also for the synthesis of medicine. As a highly efficient fertilizer, it is suitable for all kinds of soil and crops. It can also used as a bacterial culture agent, the flavoring agent for the synthesis of sake and the raw material for making potassium metaphosphate. In medicine, it is used for the uric acidification as a nutritional agent. (5) Used as feed nutritional supplements;As a quality improver, it has effects of improving the complexation metal ions and pH value, increasing the ionic strength of food, and thus improving the adhesion and water holding capacity of food. China provides that it can be used for wheat flour with the maximum usage amount of 5.0g / kg and 2.0 g/kg in the beverage.

  • Preparation products

    L-Alanine-->Calcium gluconate-->3-AMINO-2,2-DIMETHYL-4-OXO-AZETIDINE-1-SULFONIC ACID-->L-Lysine hydrochloride-->delta-Gluconolactone-->Foliar-fertilizer-->Cyclopropanecarboxaldehyde-->Gibberellic acid-->Gestodene-->Thiocyclam-->Bleomycin sulfate-->Gardenia blue pigment-->Idebenone-->guanosine 5'-(tetrahydrogen triphosphate) -->CTP-->Yemianbao-->Potassium triphosphate-->Bacillus thuringiensis-->Streptomycin sulfate -->Potassium metaphosphate-->BEAUVERICIN

  • Raw materials

    Sodium hydroxide-->Hydrochloric acid-->Potassium carbonate-->Potassium hydroxide -->Hydrogen-->Phosphorous acid-->Calcium carbonate-->Ammonium bicarbonate-->Potassium chloride -->Potassium hydroxide solution-->Congo red paper-->(2S,5R,6R)-6-[(R)-2-Amino-2-phenylacetamido]-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid-->Poly(acrylamide)-->Calcium fluoride-->Sodium dihydrogenorthophosphate-->Potassium phosphate-->(2S)-1-(3-Acetylthio-2-methyl-1-oxopropyl)-L-proline-->Sodium dihydrogen phosphate-->Potassium fluorosilicate