Hydrogenation of high boiling hydrocarbons
AssigneeThe Lummus Company
InventorsHarold Unger, Morgan C. Sze, Roger P. Van Driesen
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Abstract
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.degree. F. The recycle is cooled to a temperature of from 350.degree. to 600.degree. F. to separate coke precursors, prior to recycle to the hydrogenation. Higher conversion levels can be achieved by effecting recycle in such manner.
Claims6
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.degree. F. with at least 25-volume percent thereof boiling above 950.degree. F.;
- cooling the liquid recycle to a temperature of at least 350.degree. F. and no greater than 700.degree. 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.
Dependencies are inferred from the claim text.