This document provides information about the training received at National Fertilizers Limited (NFL) in Vijaipur, Guna, Madhya Pradesh, India. It discusses NFL's urea production process, including the key reactions, parameters, and equipment involved. It also provides specifications for the prilling tower and categories of urea produced. NFL is one of India's largest nitrogenous fertilizer producers and the first permitted to make neem-coated urea. It has four production units with a total daily urea production capacity of 5740 tons.

2. Where I did training ?
National fertilizers limited (N.F.L)
A public sector undertaking
Vijaipur, Guna (M.P)

3. Introduction about NFL
•NFL is one of the largest contributor of nitrogenous
fertilizer in the country. It was started on 23 august
1974.
• It is the first company to be permitted by Govt. of
india to produce and market neem coated urea.
•Four units – line 1 ammonia line 2 ammonia
line 1 urea line 2 urea
• CPP and waste heat reboiler
•DM water plant supplies water to Boiler feed water
(BFW)

4. Capacity of plant
• Line 1: 11 stream = 1510 tpd
12 stream = 1310 tpd
• Line 2: 31 stream = 1610 tpd
41 stream = 1310 tpd
Total production = line 1 + line 2 = 5740 tpd
Each bag is filled up by 50 kg of urea
So total bags per day = 114800 bags

5. UREA
• Molecular weight = 60.06
• M.P =132.7 degrees
• Density = 1.3335 g/cm3
• Raw materials
– Ammonia (liquid)
– Carbon dioxide (gas)

6. REACTIONS INVOLVED
2NH3 + CO2 NH2 COONH4
NH2COONH4 NH2CONH2 + H2O
SIDE REACTIONS
NH2COONH4 2NH3 + CO2
NH2COONH4+H2O NH3+CO2+H2O
NH2CONH2+H2O 2NH3+CO2
(hydrolysis)
2NH2CONH2 NH2CONH2CONH2+H2O
(Biuret)

7. PARAMETERS AFFECTING PROCESS
1. Temperature :
• Maximum equilibrium conversion around
190-200⁰C.
•Higher temperature leads to corrosion
2. Pressure:
• equilibrium pressure becomes higher when
temperature increases
3.Residence Time:
•minimum R.T. to attain equilibrium = 20 min.

8. UREA REACTOR STRIPPER
CARBAMATE SEPARATOR CARBAMATE
CONDENSOR
MEDIUM
PRESSURE
DECOMPOSER
VACCUM
CONCENTRATOR
VACCUM
SEPARATOR
PRILLING TOWER PRILLING
BUCKET

10. Wastewater recovery unit
1. Wastewater tank
2. Distillation tower preheater
3. Hydrolysers

11. Categories of urea
1. Agricultural based urea
2. Technical based urea
3. coated urea

12. Specifications for Prilling tower
Airflow through Prilling tower is 12000 Nm3/ton
PRILL SIZE PRILLING
TOWER
1. 2mm
2. 3mm
3. 4mm
90 meters
150 meters
220 meters

13. CONCLUSIONS
1. Policies:
Environment policy(ISO-14001)
Quality policy (ISO-9001)
Energy policy
Health and safety policy(ISO-9001)
2. Products:
Kisan urea HNO3,NH4NO3,NaNO3,S,Menthol,N2
etc
3. Bio fertilizer plant:
Psb, Rhizobium,Azotobacter