Simultaneous hydrogenation of light hydrocarbon(s) and gasoline - with recycle of hydrogenated gasoline to improve selectivity

摘要

Simultaneous hydrotreatment of an unsatd. C4 hydrocarbon fraction (I) and an unsatd. gasoline fraction (II) to hydrogenate butadiene in (I) and resin-forming hydrocarbons in (II) is carried out by contacting a mixt. of (I), (II) and a recycle stream (III) with H2 in the presence of a hydrogenated effluent into a C4 fraction and a gasoline fraction, and recycling part of the gasoline fraction. The ratio of (III) to (I)+(II) is 0.2-5:1. Recycling (III) inhibits hydrogenation of monoolefins, esp. butenes in (I), without the use of expensive coolants, and increases the catalyst life by avoiding recycle of butenes.