| 摘要 |
An olefin isomerization process useful in recovering isobutylene from mixed butylene feed streams is disclosed. Preferably, the feed stream is passed through a first reaction zone to convert some butene-1 to butene-2 and then fed to the lower part of a two-part fractionation system. The butene-2-rich bottoms is withdrawn and the overhead vapor is passed through a second reaction zone in admixture with hydrogen before entering the second or upper part of the fractionation system. The bottoms liquid of the upper part of the fractionation system flows into the lower part of the fractionation system. Isobutylene and recycle hydrogen are recovered from the overhead vapor of the upper part of the fractionation system.
|
