Slurry Fischer-Tropsch/Mobil Two-Stage Process of Converting Syngas to High-Octane Gasoline. Quarterly Report, 1 October-31 December 1982

摘要

Long-term stability of a Fe/Cu/K sub 2 CO sub 3 Fischer-Tropsch catalyst, designated as I-B, was successfully established using the two-stage bench-scale pilot plant. Eighty-six days on stream operation with high gas throughput and conversion have been demonstrated. A total hydrocarbon production of 815 g/g-Fe was obtained. This is substantially greater than the productions reported in the literature. Process variable studies were carried out during the latter part of the run including pressure, superficial feed-gas velocity, feed H sub 2 /CO ratio, and addition of a potassium-salt. The two-stage bench-scale pilot plant was modified to include devices for improving separation of the reactor-wax (heavy hydrocarbons retained in the slurry reactor under the operating conditions) and the Fischer-Tropsch catalyst. Detailed analytical procedures and supporting tests for analyzing the hydrogen, the carbon monoxide, the feed-gas, the first-stage Fischer-Tropsch products, and the second-stage ZSM-5 products are summarized. Due to the wide distribution and diversity of the Fischer-Tropsch products, comprehensive analytical schemes were developed with great effort. Gasoline stability tests for gum formation and oxidation showed that existent (heptane washed) gum contents were all within acceptable limits for conventional gasoline, as were the oxidation stabilities indicated by the induction period method. However, total residues on evaporation (unwashed gum) were generally high, probably due to the presence of a small amount of high-boiling, heptane-soluble hydrocarbons. (ERA citation 08:048769)