초록 ▼

In a hydrogenation operation employing an ebullated catalytic bed, recycle is recovered from the hydrogenated product with at least 25%, by volume, of the recycle boiling above 950°F. The recycle is cooled to a temperature of from 350°to 600°F. to separate coke precursors, prior to recycle to the hy

In a hydrogenation operation employing an ebullated catalytic bed, recycle is recovered from the hydrogenated product with at least 25%, by volume, of the recycle boiling above 950°F. The recycle is cooled to a temperature of from 350°to 600°F. to separate coke precursors, prior to recycle to the hydrogenation. Higher conversion levels can be achieved by effecting recycle in such manner.

대표청구항 ▼

In a process for upgrading high boiling hydrocarbon materials to valuable lower boiling materials is a hydrogenation operation including at least one expanded bed catalytic hydrogenation zone to produce an upgraded hydrogenated product, the improvement comprising: recovering from the upgraded hydrog

In a process for upgrading high boiling hydrocarbon materials to valuable lower boiling materials is a hydrogenation operation including at least one expanded bed catalytic hydrogenation zone to produce an upgraded hydrogenated product, the improvement comprising: recovering from the upgraded hydrogenation product a recycle liquid having a 5-volume percent distillation temperature of at least 450°F. with at least 25-volume percent thereof boiling above 950°F.; cooling the liquid recycle to a temperature of at least 350°F. and no greater than 700°F. to separate coke precursors from the liquid recycle; and subsequent to separation of said coke precursors providing the liquid recycle to an expanded bed catalytic hydrogenation zone.