Slurry Fischer-Tropsch/Mobil Two-Stage Process of Converting Syngas to High-Octane Gasoline. Quarterly Report, 1 July-30 September 1982

摘要

The second run of the pilot plant, designated as Run CT-256-2, was concluded after twenty days on stream. The evaluation of the second Fischer-Tropsch catalyst, a Fe/Cu/K sub 2 CO sub 3 catalyst designated as I-B, was carried out. Unfortunately, an overheating of the bottom flange of the slurry reactor and later a plugging of the feed-gas distributor forced a premature termination of the run. In the same run, an evaluation of a new second-stage ZSM-5 catalyst, designated as II-B, was also initiated. This catalyst performed satisfactorily during the run and has accumulated sixteen days on-stream time. A new run, designated as Run CT-256-3, was immediately initiated using a new batch of the same Fischer-Tropsch catalyst I-B. This run had accumulated sixty-one days on stream by the end of this reporting period. High gas throughput and conversion have been demonstrated during this time. This run is being continued beyond this reporting period. Product evaluations concerning stability, i.e., gum formation and oxidation, for the raw gasoline samples from Runs CT-256-2 and -3 were initiated. 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 08:040420)