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A process for producing liquid and, optionally, gaseous products from gaseous reactants feeds (18), at a low level, gaseous reactants into a slurry bed of solid catalyst particles (14) suspended in a suspension liquid. The gaseous reactants are allowed to react as they pass upwardly through the slur

A process for producing liquid and, optionally, gaseous products from gaseous reactants feeds (18), at a low level, gaseous reactants into a slurry bed of solid catalyst particles (14) suspended in a suspension liquid. The gaseous reactants are allowed to react as they pass upwardly through the slurry bed (14), hereby to form liquid and, optionally, gaseous products. The reaction is catalyzed by the catalyst particles. Liquid product is separated from the catalyst particles by passing, in a filtration zone (22) within the slurry bed, liquid product through a filtering medium having a plurality of openings through which the liquid passes. The openings have a controlling dimension of x microns. The proportion of catalyst particles, which have a particle size smaller than x microns, in the slurry bed is less than 18% by volume based on the total volume of the catalyst in the slurry bed.

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1. A process for producing liquid and gaseous products from gaseous reactants, which process includesselecting a strong supported solid particulate Fischer-Tropsch catalyst having fine particles smaller than x microns, with the proportion of these fine particles being less than 18% by volume of the

1. A process for producing liquid and gaseous products from gaseous reactants, which process includesselecting a strong supported solid particulate Fischer-Tropsch catalyst having fine particles smaller than x microns, with the proportion of these fine particles being less than 18% by volume of the catalyst, and all the catalyst particles being smaller than 250 microns; feeding, at a low level, a synthesis gas stream comprising mainly carbon monoxide and hydrogen, into a slurry bed of the catalyst suspended in a suspension liquid; allowing the carbon monoxide and hydrogen to react as they pass upwardly through the slurry bed, thereby to form, by means of a Fischer-Tropsch synthesis reaction, liquid and gaseous hydrocarbon products, with the suspension liquid being liquid product, and with the reaction being catalyzed by the Fischer-Tropsch catalyst; and separating liquid product from the catalyst particles by passing, in a filtration zone within the slurry bed, liquid product through a filtering medium having a plurality of openings through which the liquid passes, with the openings having a controlling dimension that permits only fine catalyst particles smaller than x microns that are initially present in the catalyst to pass through the filter openings, wherein x.ltoreq.55, and with the catalyst being sufficiently strong so that substantially no catalyst particles smaller than x microns are thereafter formed.