Process for the production of butadiene

摘要

Processes are provided for the production of butadiene from C4 containing feed stocks that contain isobutene and/or isobutane in addition to n-butene(s) and/or n-butane. The processes of the present invention generally comprise feeding the feed stock to a combination butenes isomerization reaction and distillation tower for conversion of 1-butene to 2-butenes and separation from isobutene and isobutane, followed by an oxydehydrogenation unit to convert n-butenes to butadiene. The processes may also include additional isomerization and/or dehydrogenation steps for the tower overhead and bottoms streams to create additional isobutene and/or n-butenes for valued/uses, which may include additional production of butadiene. The feed to the system may comprise any mixture or separate feeding of C4 olefins and C4 paraffins, at least one of which contains isobutene and/or isobutane.

主权项

1. A process for the production of butadiene comprising:
(a) feeding a first feed stream comprising a mixture of C4 olefins to a combination butene isomerization reaction and distillation tower to produce an overhead stream and a bottoms stream; (b) feeding a second feed stream comprising n-butanes to a first dehydrogenation unit to convert n-butanes to n-butenes; (c) feeding at least a portion of the effluent from the first dehydrogenation unit and at least a portion of the bottoms stream to an oxydehydrogenation unit to convert 2-butenes to butadiene; (d) feeding at least a portion of the effluent from at least one of the first dehydrogenation unit and the oxydehydrogenation unit to the combination butenes isomerization reaction and distillation tower; and (e) separating the butadiene in at least a portion of the effluent of the oxydehydrogenation unit from unreacted compounds and by-products.