1991 Volume 17 Issue 2 Pages 260-266
A new internal heat-integrated distillation system with a heat pump that does not require any external heating and/or cooling is proposed together with a procedure to determine the operating pressure for the internal heat-integrated distillation system.
This will give the pressure as a function of the number of stages, compositions at each stage of both columns, heat transfer areas and heat transfer coefficients of the distillation units.
Simulation results prove that the proposed system has good performance in the low-temperature separation of air and can be applied to products of various specifications. Moreover, the simulation results show that the system has a characteristic behavior in that an increase in the heat duty of the condenser increases the purity of the distillate and decreases the purity of the residue. Such behavior is never found in usual distillation systems.
