Large Volume Inorganic Chemicals - Ammonia ... - ammk-rks.net

Chapter 22.4.11 Improved CO 2 removal systemsDescriptionThe CO 2 formed in the gasification process and in the shift conversion process is normallyremoved by scrubbing with a solvent. In the processes, mechanical energy is needed to circulatethe solvent and, in most cases, heat is needed to regenerate the solution. In this way almost pureCO 2 is recovered which is typically vented, although it could be used in other processes, e.g.urea production. CO 2 removal systems using improved solvents consume substantially lessenergy than other systems. The energy consumption of a CO 2 removal system also depends onthe way it is incorporated in the ammonia plant, and is affected by the syngas purity and CO 2recovery.A simple, relatively inexpensive technique to improve the energy consumption of “hotpotassium carbonate CO 2 ” removal systems is the addition of special catalysts.Achieved environmental benefitsEnergy savings of 30 – 60 MJ/kmol CO 2 (about 0.8 – 1.9 GJ/tonne NH 3 ) is possible.Cross-media effectsNone believed likely.Operational dataNo information provided.ApplicabilityThis integrated technique applies to all new and existing steam reforming ammonia plants.EconomicsCost benefits can be assumed.Driving force for implementationCost benefits.References to literature and example plants[3, European Commission, 1997]Large Volume Inorganic Chemicals – Ammonia, Acids and Fertilisers 75