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Carbamide

Carbamide

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Ukraine, Kharkov
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8 years on Allbiz
Description

CARBAMIDE (UREA, DIAMIDE OF CARBONIC ACID)

Carbamide

- represents white or inodorous colourless crystals, easily soluble in polar solvents: water, alcohol, luquid ammonia, sulphurous anhydride. It is insoluble in unpolar solvents (alkanes, chloroform).
Density is 1,32 g/cm ³. Melting temperature - 132,7 °C, decomposition temperature - 150-160 °C.

Carbamide - very reactive connection; forms complex connections with many substances, for example with hydrogen peroxide, with normal saturated hydrocarbons; the last reaction is used in the industry for dewaxing nefty.

Chemical formula: (NH2)2CO

In the industry urea is synthesized on Bazarov's reaction from ammonia and carbon dioxide. For this reason production of urea is combined with ammoniac production.

Urea is the large-capacity product used generally as nitrogen fertilizer (content of nitrogen of 46%, is the main source of the high-concentrated nitrogen) and is issued in quality, steady against caking, in the granulated look. Equal, dense granules for exact distribution. It is convenient in application, it is evenly distributed and yields stable yield.
Derivative urea - effective herbicides.
The carbamide can be used in animal husbandry as feed additive.
Other important industrial use of urea is synthesis mochevino-aldehydic (first of all ureaformaldehyde) the pitches which are widely used as adhesives in production of the fiber boards (FB) and furniture production.
In oil industry it is used for dewaxing of oils and motor fuels with release of soft paraffin raw materials for receiving protein-vitamin preparations, fatty alcohols and acids, detergents, etc.
Urea is also applied to purification of combustion gases of thermal power plants, boiler rooms, incineration plants, internal combustion engines, etc. of nitrogen oxides.
In medicine pure urea is used as dehydrational means (antineoplastic preparations) for the prevention and reduction of hypostasis of brain, and also for production of sleeping medicines (veronal, luminal, bromural).
The carbamide is registered as food additive of E927b. It is used, in particular, by production of chewing gum.

Depending on appointment the carbamide is produced two brands: And - for the industry; B - for plant growing.

Physical and chemical characteristics of carbamide (urea) of GOST 2081-92.
Name of indicator Norm for brand and grade
And B
The highest The first The highest The first The second
Mass fraction of nitrogen in terms of dry matter, %, not less 46,3 46,2 46,2 46,2 46,2
Mass fraction of ureido formamide, %, no more 0,6 1,4 1,4 1,4 1,4
Mass fraction of free ammonia, %, no more, for carbamide:
crystal
prillirovanny

0,01
0,02

0,01
0,03

-
-

-
-

-
-
Mass fraction of water, %, no more:
drying method
Fischer's method

0,3
0,6

0,3
0,6

0,3
0,5

0,3
0,5

0,3
0,6
Friability, % - - 100 100 100
Particle size distribution, %:
mass fraction of granules size, in mm:
from 1 to 4, not less
from 2 to 4, not less
less than 1, no more
the rest on sieve of 6 mm, no more


-
-
-
-


-
-
-
-


94
70
3
Absence


94
50
5
Absence


94
-
5
Absence
Static durability of granules, kgf on granule, not less - - 0,7 0,5 0,3


Safety requirements of carbamide (urea) of GOST 2081-92.
Danger class 3
Main properties and types of danger
Main properties Crystal powder of white color.
Vzryvo-and fire danger Under normal conditions negoryuch, it is fire and explosion-proof.
Self-ignition temperature - 715 °C. Temperature of ignition is absent to 220 °C above which the carbamide decays with formation of slow-burning substances.
Danger to the person Can get into human body through respiratory organs, digestive tract, without causing at the same time sharp toxic action.
Long inhalation of dust of carbamide in high concentration leads to development of chronic inflammation of mucous membrane of tracheas and bronchial tubes (trakheobronkhit), changes of function of liver and kidneys.
Means of individual protection Special suit, boots or boots, rezinotrikotazhny gloves, respirator RU-60m-V, RU-60M-KD, U-2k, F-62Sh, RPA-1 or RPG-67, wadded and gauze bandage, gas mask of the CD or M brand.
Necessary actions in emergencies
General character
At leak, flood and scattering
At the fire
Neutralization
Measures of first aid

The carbamide under normal conditions negoryuch, is fire and explosion-proof, on extent of impact on organism belongs to substances of the 3rd class of danger.

Packaging, transportation and storage.
The carbamide is packed into the paper bituminized or laminated bags, the plastic or woven polymeric laminated bags, woven polymeric bags with insert, and also into soft specialized containers of one-time use.
The carbamide is transported all means of transport. The carbamide is transported in bulk in specialized hopper-cars, in the closed sea deck vessels, motor transport, and also in rolling stock. The product packed into soft specialized containers, and also the transport packages fastened with film is allowed to be transported in gondola cars and open motor transport.
The carbamide is stored in the closed warehouse protecting product from hit of rainfall. At storage of product its mixing with other types of fertilizers in bulk is not allowed. Soft containers with carbamide and the transport packages fastened with synthetic film are allowed to be stored on the open areas.
Warranty period of storage - 6 months from the date of production, product for retail trade - 2 years from the date of production.

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