Abstract
The close-boiling and azeotropic nature of the tetrafluoromethane and nitrogen trifluoride binary mixture complicates its separation. Extractive distillation using 1,1,2,2-tetrafluoroethyl 2,2,3,3-tetrafluoropropyl ether as an entrainer is investigated for the separation of tetrafluoromethane and nitrogen trifluoride. Isothermal phase equilibrium data were measured for the binary systems of tetrafluoromethane + 1,1,2,2-tetrafluoroethyl 2,2,3,3-tetrafluoropropyl ether and nitrogen trifluoride + 1,1,2,2-tetrafluoroethyl 2,2,3,3-tetrafluoropropyl ether between temperatures of (283.15 to 303.15) K. The binary phase equilibrium data reveal that the proposed solvent has an affinity for nitrogen trifluoride. The data were modeled using the Peng-Robinson equation of state. The theoretical design and optimization of the extractive distillation process was performed in Aspen Plus. The optimal operating parameters were found by minimizing the total annual cost of the process. The new solvent was benchmarked against the processes proposed in the literature.
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