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With quenched gases simulating those of the Slagging Lurgi process, a preconditioning shift from a 0.5:1.0 to a 1.1:1.0 to a 1.3:1.0 H2/CO ratio was required prior to direct methanation. This shift was achieved by using the GRI-C-318 catalyst and controlling the feed stream concentration and space velocity in the preconditioning stage. Subsequent design data were obtained for four direct methanators that successfully converted the CO in the original feed mixture from 46 to 9 mole percent. The percent of CO conversion as a function of space velocity and temperature at 450 psig was determined for each of the four reactor stages. The experiments consisted of obtaining data for each reactor stage. The effluent from the first reactor was simulated and used as feed to the second reactor, and so on. For each reactor stage, with its corresponding feed composition, the CO conversion was determined at temperatures from 750 to 950F and at space velocities from 2,000 to 16,000 SCF/hr-cu ft. The pressure, temperature, space velocity, and feed and product compositions at each reactor stage provided the needed design data.