Numerical analysis of pressure effects on heavy water separation characteristics for a pair of dual temperature multistage-type H2/H2O-exchange columns.

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In order to study how the operating pressure has influence on the heavy water separa-tion characteristics for a pair of dual temperature multistage-type H2/H2O-exchange columns, the authors utilized the analytical expressions derived from the finite difference equation describing the material balance in the exchange column. The separation characteristics of the system were studied theoretically under the conditions where the temperature in a hot column th=200°C, the pressure in a hot column π ?? 50 atm and the pressure in a cold column π=550 atm. As the results, the optimum modified specific column volume v*opt decreases with the increase of π and then keeps the nearly constant value, and is smaller at π=50 atm than at π =30 atm in the case where the temperature in a cold column tc is constant. Other important parameters such as the optimum operating temperature in a cold column tcopt, the optimum numbers of stages in a hot column Mopt and in a cold column Nopt, the optimum hydrogen to feed water molar flow ratio ropt and the optimum degradation ratio δopt were also calculated.
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