AMMONAB - Steady-State Absorption Column Design

10 AMMONAB - Steady-State Absorption Column Design 

Ammonia is recovered from an air-ammonia gas mixture by absorption into water, using a countercurrent packed column. The absorption of ammonia in water is accompanied by the evolution of heat which causes a rise in the liquid water temperature and hence a change in the equilibrium relationship. The problem and data values are taken from Backhurst and Harker (1990). 

The gas is at high concentration and therefore the column component balance equations are based on mole ratio concentration units. The form of the balance equations follow those of Sec. 4.4.1. 

The temperature in the gas phase is assumed constant with no heat losses, and zero heat exchange between gas and liquid. 

The inlet gas flow is 1.25 m /m s measured at NTP containing 5 per cent by volume NH3. Hence 

5 Simulation Tools and Examples of Chemical Engineering Processes 

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AMMONAB - Steady-State Design of a Gas Absorption Column with Heat Effects System... 

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