| 摘要 |
A) Provision of an n-butane-containing feed gas stream a; B) introduction of the n-butane-containing feed gas stream a into at least one dehydrogenation zone and nonoxidative catalytic dehydrogenation of n-butane to give a product gas stream b comprising n-butane, 1-butene, 2-butene, butadiene, hydrogen, low-boiling secondary constituents and possibly water vapor; C) removal of hydrogen, the low-boiling secondary constituents and, if appropriate, water vapor to give a C<SUB>4 </SUB>product gas stream c consisting essentially of n-butane, 1-butene, 2-butene and butadiene; D) separation of the C<SUB>4 </SUB>product gas stream c into a recycle stream d1 consisting essentially of n-butane and a stream d2 comprising 1-butene, 2-butene and butadiene by extractive distillation and recirculation of the recycle stream d1 consisting essentially of n-butane to the dehydrogenation zone; E) introduction of the stream d2 comprising 1-butene, 2-butene and butadiene into a selective hydrogenation zone and selective hydrogenation of butadiene to 1-butene and/or 2-butene to give a stream e comprising 1-butene and 2-butene; F) introduction of the stream e comprising 1-butene and 2-butene and a circulating stream g comprising 1-butene and 2-butene into a distillation zone and isolation of a desired product stream f1 consisting essentially of 1-butene to leave a 2-butene-containing stream f2; G) introduction of the 2-butene-containing stream f2, if appropriate after a purge gas stream has been separated off, into an isomerization zone and isomerization of 2-butene to 1-butene so as to give a circulating stream g comprising 1-butene and 2-butene and recirculation, if appropriate after a purge gas stream has been separated off from the circulating gas stream g, of the circulating gas stream g to the distillation zone.
|
