Vocational training

PresentationON

Urea production processBy

VishakhaB.Tech final yearChemical engg.

(Institute of technology)(Guru Ghasidas University)

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 tpd12 stream = 1310 tpd

• Line 2: 31 stream = 1610 tpd41 stream = 1310 tpd

Total production = line 1 + line 2 = 5740 tpdEach 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 + CO2NH2COONH4+H2O NH3+CO2+H2ONH2CONH2+H2O 2NH3+CO2 (hydrolysis)2NH2CONH2 NH2CONH2CONH2+H2O (Biuret)

PARAMETERS AFFECTING PROCESS

1. Temperature : • Maximum equilibrium conversion around

190-200⁰C. •Higher temperature leads to corrosion2. Pressure: • equilibrium pressure becomes higher when

temperature increases3.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

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. 2mm2. 3mm3. 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 etc3. Bio fertilizer plant: Psb, Rhizobium,Azotobacter

THANKYOU