Chinese
Urea state level
From;    Author:Stand originally
GB 2440, 91 urea







1 theme content and suitable scope
Method of the technical requirement that this standard set urea, experiment, examine regulation and mark, pack, carry and keep in storage.

This standard applies to the urea that makes by ammonia and carbon dioxide synthesis. Its are main the raw material that utility is the industrial department such as agricultural fertilizer, plastic, colophony, coating, medicine.

Structural formula: CO(NH2)2

Relative to molecular quality: 60.055(basis international was expressed relative to atomic mass 1987)

2 cite standard
Of content of total nitrogen of GB/T 2441 urea determine the titration after distillation

2 Niao content shrinks in GB/T 2443 urea determine prismatic photometry

Of the moisture in GB/T 2444 urea determine Carl Fei rests law

GB/T 2445 is industrial of urea iron content determine smooth photometry of standing forest of adjacent humble 

GB/T 2446 is industrial of urea alkalinity determine capacity method

GB/T 2447 is industrial of content of urea water-insoluble matter determine weight law

Of granuality of GB/T 2448 urea determine screening law

Fertilizer of GB 8569 solid is packed

GB/T 13256 is industrial of urea sulfate content determine visual the law that compare chaotic

3 technologies ask
3.1 exteriors: Grain or crystallization.

3.2 urea should accord with a watch the requirement of 1:

Express % of index of 1 urea technology
Index name




  
Industrial
Agriculture is used
Classy taste first-rate product qualification classy taste first-rate product qualification
Color white white or light color
Total nitrogen (N) content (with dry basis plan) ≥ 46.3 46.3 46.3 46.3 46.3 46.0
Shrink 0.5 0.9 1.0 0.9 1.0 1.5 of ≤ of   of   of 2 Niao content
Moisture (0.3 0.5 0.7 0.5 0.5 1.0 of ≤ of H2O) content  
Iron content (with Fe plan) ≤ 0.0005 0.0005 0.0010
Alkalinity (with NH3 plan) ≤ 0.01 0.02 0.03
Sulfate content (with SO4-2 plan) ≤ 0.005 0.010 0.020
0.005 0.010 0.040 of ≤ of   of water-insoluble matter content
Granuality (0.85 ~ of φ 90 90 90 90 90 90 of 2.80mm) ≥






Note: Crystallization shape urea does not dominate granuality index.

4 experiments method
Of content of 4.1 total nitrogen determine

Undertake according to the regulation of GB/T 2441.

4.2 shrink of 2 Niao content determine

Undertake according to the regulation of GB/T 2443.

Of 4.3 moisture determine

Undertake according to the regulation of GB/T 2444.

Of 4.4 iron content determine

Undertake according to the regulation of GB/T 2445.

Of 4.5 alkalinity determine

Undertake according to the regulation of GB/T 2446.

Of 4.6 sulfate content determine

Undertake according to the regulation of GB/T 13256.
Of content of 4.7 water-insoluble matter determine
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