A method for converting synthesis gas into liquid hydrocarbons, the method comprising: introducing a synthesis gas feed into a Fischer-Tropsch reactor of a Fischer-Tropsch system at a superficial gas velocity greater than the average sedimentation velocity and/or greater than the minimum fluidization velocity of catalyst in the catalytic reactor, wherein the Fischer-Tropsch system comprises: a catalytic reactor fluidly connected with at least three slurry loops, wherein the reactor comprises at least as many reactor product outlets and at least as many slurry return inlets as slurry loops, a syngas feed inlet and an overhead tail gas outlet located at or near the top of the reactor; wherein each slurry loop comprises a separation system comprising at least one separation device for separating concentrated catalyst slurry from liquid product; an inlet positioned in the top portion of the at least one separator and fluidly connected to one of the reactor product outlets via a slurry offtake, an outlet of the at least one separator fluidly connected to one of the slurry return inlets via a slurry return, and a product outlet of the at least one separator for removal of liquid product therefrom; separating concentrated catalyst slurry from the reaction product via the at least three slurry loops; removing liquid hydrocarbon product from the at least one separator of each of the at least three slurry loops; returning concentrated catalyst slurry to the catalytic reactor via the at least as many slurry returns and the at least as many slurry return inlets; and removing the overhead tail gas via the overhead tail gas outlet. introducing a synthesis gas feed into a Fischer-Tropsch reactor of a Fischer-Tropsch system at a superficial gas velocity greater than the average sedimentation velocity and/or greater than the minimum fluidization velocity of catalyst in the catalytic reactor, wherein the Fischer-Tropsch system comprises: a catalytic reactor fluidly connected with at least three slurry loops, wherein the reactor comprises at least as many reactor product outlets and at least as many slurry return inlets as slurry loops, a syngas feed inlet and an overhead tail gas outlet located at or near the top of the reactor; wherein each slurry loop comprises a separation system comprising at least one separation device for separating concentrated catalyst slurry from liquid product; an inlet positioned in the top portion of the at least one separator and fluidly connected to one of the reactor product outlets via a slurry offtake, an outlet of the at least one separator fluidly connected to one of the slurry return inlets via a slurry return, and a product outlet of the at least one separator for removal of liquid product therefrom; separating concentrated catalyst slurry from the reaction product via the at least three slurry loops; removing liquid hydrocarbon product from the at least one separator of each of the at least three slurry loops; returning concentrated catalyst slurry to the catalytic reactor via the at least as many slurry returns and the at least as many slurry return inlets; and removing the overhead tail gas via the overhead tail gas outlet.