Reactive Distillation for Fischer-Tropsch Synthesis: Simulation-Based Design Methodology Using Aspen Plus

In a series of earlier papers, it has been shown through simulations in Aspen Plus that reactive distillation (RD) is feasible for Fischer-Tropsch Synthesis (FTS) [Srinivas et al., Ind. Eng. Chem. Res. 2009, 48, 4710-4718]. The flexibility offered by changing parameters such as reflux ratio, etc. has also been investigated through parametric studies [Srinivas et al., Ind. Eng. Chem. Res. 2009, 48, 4719-4730]. As an extension of the previous works, a methodology is now proposed to design a RD column for FTS in Aspen Plus, utilizing the kinetic and thermodynamic models reported previously. Slurry reactor simulations are performed initially to form a design basis and a simple RD column is configured. This is followed by catalyst redistribution, addition of coolers, nonreactive stages, and side draws. The methodology is illustrated step-by-step for three examples in a systematic manner. The possibility of multiple designs, expected difficulties in execution, and limitations of the algorithm are discussed.