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Urea production process

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SHIKHA THAPA
SHIKHA THAPA

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.

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Urea production process
Where I did training ? National fertilizers limited (N.F.L) A public sector undertaking Vijaipur, Guna (M.P)
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)
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
UREA Molecular weight = 60.06 M.P =132.7 degrees Density = 1.3335 g/cm3 Raw materials Ammonia (liquid) Carbon dioxide (gas)
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)
PARAMETERS AFFECTING PROCESS 1. Temperature : Maximum equilibrium conversion around 190-200C. 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.
UREA REACTOR STRIPPER CARBAMATE SEPARATOR CARBAMATE CONDENSOR MEDIUM PRESSURE DECOMPOSER VACCUM CONCENTRATOR VACCUM SEPARATOR PRILLING TOWER PRILLING BUCKET
Urea production process
Wastewater recovery unit 1. Wastewater tank 2. Distillation tower preheater 3. Hydrolysers
Categories of urea 1. Agricultural based urea 2. Technical based urea 3. coated urea
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
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
Urea production process

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Urea production process

  • 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 190-200C. 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