International name: Carbamide, Urea 46

Synonyms: urea, carbonic acid diamide

Chemical formula: (NH2) 2CO

Appearance: colorless crystals without a smell

Production: Ukraine

Packaging and storage: bag 50 kg; up to 2 years

Description

Carbamide (urea) is a chemical compound, carbonic acid diamide. White crystals soluble in polar solvents (water, ethanol, liquid ammonia).

Colorless crystals, odorless, crystal lattice Tetragonal syngony (a = 0.566 nm, b = 0.4712 nm, c = 2); undergoes polymorphic transformations of crystals. Urea is readily soluble in polar solvents (water, liquid ammonia and sulfurous anhydride), the solubility decreases with decreasing polarity of the solvent. Urea is insoluble in non-polar solvents (alkanes, chloroform).

The effectiveness of carbamide, used as the main fertilizer, is in no way inferior to all known ammonium nitrate. At the same time, it is carbamide that contains the greatest amount of nitrogen, which makes it highly expedient to use it.

Carbamide is also used as foliar top dressing of vegetable, fruit crops and late fertilizing of wheat, aimed at increasing the protein content in the finished grain. Carbamide is valuable in that when contact with the plant does not burn, and therefore, no harm is done to the leaves. This quality provides excellent digestibility to fertilizer. At the same time, with a superficial application to the soil, carbamide must be immediately closed, in order to prevent nitrogen losses due to the volatilization of ammonia.

Properties

Carbamide in pure form:

    The solubility in water (100 g): at + 20 ° C - 51.8 g, at + 60 ° C - 71.7 g, at +120 ° C - 95.0 grams
  • Carbamide is soluble in methanol, ethanol, isopropanol, isobutanol, ethylacetate, insoluble in chloroform.
  • Urea is capable of forming compounds with the inclusion of inorganic substances and with organic substances.
  • The melting point is + 132.7 ° C.
  • Density at + 25 ° C - 1330 kg / m3
  • When heated to 150 ° C and higher, carbamide is converted to NH4NCO, then NH3 and CO2, biuret, cyanuric acid.
  • In a dilute solution at 200 ° C, full hydrolysis of urea with formation of NH3 and CO2 is possible.

    Carbamide as a fertilizer:

    Colorless granules from 1 to 4 mm in size. The mass fraction of biuret should not exceed 1.4%.

    • Mass fraction of water by the method of drying - no more than 0,3%.
    • Friability - not less than 100%.
    • Mass fraction of nitrogen in terms of dry matter - 46.2%

      Getting

      Carbamide is produced by synthesis from ammonia and carbon dioxide (CO 2 ) at high pressure and temperature. To improve physical and chemical properties, crystalline urea is granulated. Granules to reduce caking is covered with a thin film of fat additive.

      Application

      Two brands of carbamide are produced in the : A for the industry and B for the crop production.

      Carbamide is used for all crops as a basic fertilizer (for main entry ),

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