Brochure for the Chemical Industry - KROHNE - #29

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29 Due to its high nitrogen content, urea is the world‘s leading nitrogen based fertilizer. It is industrially produced, from natural gas for example, in large quantities using a variety of processes. In large plants, ammonia and finally urea, is produced from natural gas, air and water. Carbon dioxide is a byproduct of ammonia production. It is removed from the mixture using a gas scrubbing process and then used in a later step in the urea. Thus the environmentally harmful carbon dioxide is not released into the atmosphere but is processed into a product. Count on more precision. The urea, initially occurring in solution, is converted to pellets or sold as liquid fertilizer. The world‘s largest facilities produce several thousand tonnes of urea per day. Due to the high energy requirement, the most efficient use of energy possible as well as a high carbon dioxide yield is the goal. Now is the time for KROHNE measuring devices optimising the gas scrubbing and monitoring the air intake. to low pressure absorber High pressure scrubber Falling film evaporator & stripper Urea synthesis OPTISONIC 7060 Water Air Natural gas (sulphur-free) Water Catalyst 500 °C Reactor Scrubber CO2- removal N2, H2, CO2 Synthesis gas production Alkaline circulation OPTIFLUX 4300 Scubbing agent regeneration diethanolamine Catalyst 450 °C, 300 bar Ammonia synthesis Ammonia CO2 Air Urea solution CO2 + NH3 Urea, water & carbamate Carbamate condenser Carbamate recirculation OPTIFLUX 4300 OPTISONIC 7060 Ammonia production Urea production NH3 CO2 Urea N2, H2 solution Fertilizer KROHNE