Urea2.jpg Urea2.jpg

Urea

CAS Registry Number (CASRN):

57-13-6 ,

Units of original limits:

mg/m3 ,

Conc dep:

Y ,

name:

Urea ,

formula:

CH4N2O۱ ,

CAS Registry Number (CASRN):

57-13-6 ,

SAX Number:

USS000 ,

Units of original limits:

mg/m3 ,

Conc dep:

Y ,

p to m:

2.45514 ,

HR:

2 ,

specific gravity:

1.335 ,

state at 25 °C:

S ,

Molar mass (g/mol):

۶۰٫۰۶ ,

Density (g/cm3):

1.32 ,

Melting point (°C):

133–135 ,

solubility in water (g/100g):

107.9 ,

comment

Urea

urea, also called Carbamide, the diamide of carbonic acid. Its formula is H2NCONH2. Urea has important uses as a fertilizer and feed supplement, as well as a starting material for the manufacture of plastics and drugs. It is a colourless, crystalline substance that melts at 132.7° C (271° F) and decomposes before boiling.

Urea is the chief nitrogenous end product of the metabolic breakdown of proteins in all mammals and some fishes. The material occurs not only in theurine of all mammals but also in their blood, bile, milk, and perspiration. In the course of the breakdown of proteins, amino groups (NH2) are removed from the amino acids that partly comprise proteins. These amino groups are converted to ammonia (NH3), which is toxic to the body and thus must be converted to urea by the liver. The urea then passes to the kidneys and is eventually excreted in the urine.

Urea was first isolated from urine in 1773 by the French chemist Hilaire-Marin Rouelle. Its preparation by the German chemist Friedrich Wöhler from ammonium cyanate in 1828 was the first generally accepted laboratory synthesis of a naturally occurring organic compound from inorganic materials. Urea is now prepared commercially in vast amounts from liquid ammonia and liquid carbon dioxide. These two materials are combined under high pressures and elevated temperatures to form ammonium carbamate, which then decomposes at much lower pressures to yield urea and water.

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