Catalyst separation technology improves FCC gasoline yields. T.E. Johnson et al. OGJ, 15 June 1998, 96(24), 65, 66, 67--70.
Details are given of MagnaCat which uses simple, high field-strength permanent magnets to separate, remove, and discard the oldest, most metals-laden and least active catalyst from the FCC inventory. This withdrawal of older catalysts results in higher gasoline yield, reduced hydrogen production, improved coke selectivity, and lower catalyst and additives consumption. The principles of MagnaCat are described, removal of oldest catalyst and pilot plant studies are examined. The Canton, Ohio, refinery results, Canton update, and catalyst additives are discussed. 3 refs.