The indirect coal liquefaction route to produce transportation fuels, i.e., the Fischer-Tropsch synthesis, may favorably be carried out in the slurry phase. The paper reports on measurements of gas holdup and heat and mass transfer in bubble column slurry reactors of 4.1 and 10 cm diameter. The study was done under conditions prevailing In the Fischer-Tropsch slurry reactor (Rheinpreusen-Koppers process). The results enable, at least, an estimation of the majority of hydrodynamic properties involved in designing a slurry-phase reactor. Under the conditions of the Fischer-Tropsch synthesis the slurry reactor can be treated as a two-phase system which permits some conclusions concerning the favorable flow regimes and gas velocities.

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Fischer-Tropsch (FT) synthesis was studied on a specially prepared /Fe catalyst in the slurry phase. Compared to classical K promoted Fe precipitation catalysts, the /Fe catalyst gives higher yields of C2 to C4 olefins, i.e., about 60 g/Nm3 synthesis gas converted. The product slate follows the Schulz-Flory distribution and is little influenced by operational conditions. From the experimental conversion data, rate constants for overall synthesis gas conversion were calculated.