Process for isolating and recovering butene-1 of high purity

Details Process for isolating and recovering butene-1 of high purity Process for isolating and recovering butene-1 of high purity

1984-05-10

1987-02-24

Bashore, S. Leon

Distillation: processes, separatory

With chemical reaction

Including step of adding catalyst or reacting material

203 73, 203DIG6, 585811, 585829, 585832, 585833, B01D 334

Patent

active

046455760

ABSTRACT:
This invention provides a process for isolating and recovering butene-1 of high purity at high yield. Firstly, a butane-butene fraction containing 0.1 to 7 wt % of isobutylene, 10 to 50 wt % of butene-1 and 5 to 20 wt % of isobutane is rectified to reduce the content of isobutane to not more than 0.1 wt %. Then, the rectified butane-butene fraction is passed through a reactor packed with an extrusion molded silica-alumina catalyst to polymerize isobutylene at a reaction velocity as high as 50 times or more of that of butene-1, thus forming oligomers of isobutylene. Finally, the hydrocarbon mixture from the reactor is rectified to remove the oligomers of isobutylene and the other C.sub.4 -hydrocarbons.

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