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1 Polish Journal of Applied Chemistry

1 1999

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Calculating liquid-vapour equilibrium of NH3-CO2-H2 system under the conditions of urea synthesis process

Piotrowski J., Kozak R., Kujawska M.

Polish Journal of Applied Chemistry

1999

Vol. 43, nr 1-2

57-67

The paper presents a new method for calculation of liquid-vapour equilibrium establishing in an urea synthesis process under the following conditions: T=433-463 K, NH(3)JCO2=2.3-3.6, Hpexc/CO2=O.I-O.6 and in the whole range of carbon dioxide conversion. The method is based on the excess Gibbs free energy of the liquid phase which leads to equations describing the composition effect on the activity coefficients according to Gibbs-Duhem equation. The method makes it possible to calculate the equilibrium composition of liquid and gas phase as well as equilibrium pressure and gives thermodynamic characteristics of the system.