Urea is an organic compound derived from the metabolism of protein in animals and humans and is excreted in urine. The important raw materials in urea fertilizer production are ammonia and carbon dioxide. Urea is synthesized through a two-step reversible reaction using ammonia and carbon dioxide under high temperature and pressure. It is then mixed with water to form urea fertilizer. Urea fertilizer is easy to dissolve, white in color, and has high nitrogen content, making it suitable for leaf application and plants in dry conditions.

1. Urea production
Prepared by
Miss Santhiya

2. Step Urea
production
The synthesis of
urea in the
industry.
Usefully
Meaning
Preparation
of NH2 ,CO2

3. The meaning of urea fertilizer.
Urea is an organic compound that is derived from the
metabolism of protein. Animals and people come out with
the urine.

4. Synthesis of Urea in the industry.
2NH3 + CO2 NH2- CO – ONH4 H = -67,000 BTU
NH2-C-ONH4 NH2-CO-NH2 + H2O H = +18,000 BTU
*** Important raw material gas NH3 and CO2
- Both reactions are reversible reactions
- The efficiency of the production process, it depends on the
temperature, pressure and concentration of each substance.
- Using a temperature in the range 180-210° C pressure 140-250 atm.

5. Preparation of gas NH3 and CO2
Step 1
Discount Temperature, Add Pressure
Air Liquid air
-N2 boiling point-195 °C
-O2 boiling point-183 °C
Extract sequence section.
Step 2 O2 N2
Ni
CH4
Step 3 Split H2 Exit CO Remove CO
To react with water vapour
FeO,Cr2 O3
CO(g) +H2 O(g) CO2(g)+ H2 (g)

6. Urea fertilizer production
step 1
All gas will be sent to
tower with water
sprayed down.
CO2 will become
soluble H2CO3 acid
step 2
Remove acid H2CO3 Split CO2
temperature increase
H2CO3(aq) CO2(g)+ H2O(l)
Pressure reduction
H2 Not soluble to pass out
through the upper portion of the
tower is stored using the following.
Step 3
N2 (g) + 3H2 (g) 2NH3(g)
NH3 To complete the reaction CO2
Become a urea fertilizer
CH3(g)+CO2(g) NH2CONH2(s)+H2O(l)

7. Lignite coal is used as a raw material instead of natural gas.
Preparation CO2 and H2 By incineration,
combined with O2 Will be a
Exclude unwanted gases etc H2S and NO moved CO Become
a CO2 . By removing the gas mix to react with water vapor at
high pressure and have an appropriate catalytic CO
Will be included with H2O a CO2 and H2O
After mixed gas CO2 and H2 Subsequent
processes. For the preparation of urea
fertilizer will be the same as if you use
natural gas as a raw material.
CO2
9.4%
CO
59.9%
Etc.
2.1%
H2
28.6%

8. แผนภาพสรุปการผลิตปุ๋ยแอมโมเนียมซัลเฟตและปุ๋ยยูเรีย

9. Ice pellets
are white. High nitrogen
The
properties of
urea fertilizer
fertilizer is
ammonium is the
secondary N2
All46%
The easily soluble
100 degrees. Soluble
sulphate ammonium
fertilizer 7 times
Is a
compound
that is
spotted
Moisture
easily.

10. Suitable for
interval
plants
growing
Benefits
As fertilizer
on leaves
Moisture
easily.
Suitable for
plants with
low water
conditions.

11. Question ???
1. Urea is an organic compound derived from
the processes of living organisms.
A. Synthetic light processes.
B. The digestive process.
C. The process of Metabolism, protein Animals and people
come out with the urine
D. Process Power range

12. 2. An important raw material in the
production process of urea fertilizer is ?
A. NH3 And CO2
B. CO2 And H2O
C. N And P
D. K And CO

13. 3. Work to step it correctly NH3.
A. Release air pressure and increase temperature decrease and
finally failed.
B. Bring liquid to air separation sequence section N2 , O2 .
C. Bring natural gas extraction NH4 And bring O2 Comes
complete a reaction with NH4
D. Split H2 Exit CO2 Remove CO2 To react with water vapou
E. It has become a H2 and CO2 Remove N 2 + H2 becom NH3
Answers A ,B , C, D,E

14. 4. The properties of urea fertilizer, what are the important
A. It is easy soluble white pellets and have N2 high As
fertilizer on leaves.
B. As black pellets Slowly soluble and have N2 low.
C. Melt water quickly and Suitable for plant growth
D. When you use frequently will make plants grow
faste