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The design and optimization of a natural gas to hydrocarbon liquids (GTL) process is considered, mainly from the view of maximizing the variable income during operation. Autothermal reforming (ATR) is used for synthesis gas production. The kinetic model for FischerÀTropsch (FT) reactions is the one given by Iglesia et al. for a cobalt-based FT reactor. For the product distribution, three alternative expressions for the chain growth factor α are compared.

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The optimal design of a natural gas-to-liquid hydrocarbons (GTL) process with a multistage cobalt-based Fischer-Tropsch reactor and interstage product separation is considered. The objective function is to maximize the wax (C 21+ ) production rate at the end of the reactor path. Sectioning of the Fischer-Tropsch reactor increases the chain growth probability inside the reactor which results in a higher production of wax. The carbon efficiency of the two-stage reactor is distinctly higher than that of the single-stage reactor.