| 摘要 |
A turbulent, dense fluid-bed of a medium pore zeolite metal-losilicate catalyst, the bed having a tailored distribution of weight fractions of particles having activities which fall generally along a predetermined curve of activity distribution, is operated under low severity conditions at low WHSV, under moderate pressure and moderate severity to obtain surprisingly high conversion to C5+ hydrocarbons having an olefin content in excess of about 80%, about one third by weight of which is distillate (C9+). Only a small amount of cycloolefins and a negligibly small amount of aromatics and paraffins are produced. The distillate is formed with a single pass yield in the range from about 10-40 weight percent. The reactor is operated only in the distillate mode. The dense fluid bed has a density, measured at the bottom of the reaction zone, less than 640 kg/m3 (40 lb/ft3), and preferably operates at a temperature in the range from about 250 DEG C. (482 DEG F.) to about 371 DEG C. (700 DEG F.), and a pressure in the range from above about 200 kPa (15 psig) but below about 2800 kPa (400 psig). Despite operating under "easy" conditions, this unique process provides per pass conversion of olefins, and selectivity to C5+ hydrocarbons, each in excess of 80%. |
