Process for the utilization of refinery C4 streams

Details Process for the utilization of refinery C4 streams Process for the utilization of refinery C4 streams

2005-02-01

2005-02-01

Dang, Thuan D. (Department: 1764)

Chemistry of hydrocarbon compounds

Plural serial diverse syntheses

Including alkylation to produce branched-chain paraffin

C585S332000

Reexamination Certificate

active

06849773

ABSTRACT:
A process is disclosed for preparing a C4stream for feeding to an alkylation process which reacts isobutane with butene to produce isooctane. The C4stream is treated in a first distillation column reactor to remove dienes and mercaptans and separate out any C5's which might be present. The treated C4's are then fed to a second distillation column reactor that concurrently isomerizes 1-butene to 2-butene and splits the normal C4's from the iso C4'S. The iso C4's are then fed to a third distillation column reactor where a portion of the isobutene is saturated to isobutane. The C4's from the isomerization/splitter are combined with the C4's from the hydrogenation unit and fed to a cold acid alkylation unit. The third distillation column may also oligomerize a portion of the isobutene to diisobutene in the upper end which is saturated in the bottom of the column to isooctane.

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