Patent ID: 9193647
Filing Date: 2015-11-24
Classification: C07C

Abstract:
1. A process for preparing butadiene from n-butane, comprising the steps of A) providing a feed gas stream a comprising n-butane; B) feeding the feed gas stream a comprising n-butane into at least one first dehydrogenation zone and nonoxidatively catalytically dehydrogenating n-butane to obtain a gas stream b comprising n-butane, 1-butene, 2-butenes, butadiene and hydrogen, with or without water vapor, with or without carbon oxides and with or without inert gases; C) compressing in at least one first compression stage and cooling the gas stream b to obtain at least one condensate stream c D) absorbing the stream c E) extractively distilling the stream d F) distilling the stream e G) feeding stream f and an oxygenous gas into at least one second dehydrogenation zone and oxidatively dehydrogenating 1-butene and 2-butenes to obtain a gas stream g comprising n-butane, unconverted 1-butene and 2-butenes, butadiene and water vapor, with or without carbon oxides, with or without hydrogen and with or without inert gases.