公开(公告)号：US20190337870A1

公开(公告)日：2019-11-07

申请号：US16324315

申请日：2017-08-08

Applicant: BASF SE ,  LINDE AG

Inventor： JAN UNGELENK ,  Oliver HAMMEN ,  Ulrich HAMMON ,  Rainer ECKRICH ,  Signe UNVERRICHT ,  Christian WALSDORFF ,  Heinz BOELT ,  Hendrik REYNEKE ,  Christine TOEGEL ,  Anton WELLENHOFER ,  Ulrike WENNING

IPC: C07C5/48 ,  C07C7/11 ,  C07C11/167

Abstract: Process for preparing butadiene from n-butenes, which has a start-up phase and an operating phase and the operating phase of the process comprises the steps: A) provision of a feed gas stream a1 comprising n-butenes; B) introduction of the feed gas stream a1 comprising n-butenes, an oxygen-comprising gas stream a2 and an oxygen-comprising recycle gas stream d2 into at least one oxidative dehydrogenation zone and oxidative dehydrogenation of n-butenes to butadiene, giving a product gas stream b comprising butadiene; C) cooling and compression of the product gas stream b, giving at least one aqueous condensate stream c1 and a gas stream c2 comprising butadiene; D) introduction of the gas stream c2 into an absorption zone and separation of incondensable and low-boiling gas constituents as gas stream d from the gas stream c2 by absorption of the C4 hydrocarbons in an absorption medium, giving an absorption medium stream loaded with C4 hydrocarbons and the gas stream d, and recirculation of the gas stream d as recycle gas stream d2 to the oxidative dehydrogenation zone, where the start-up phase comprises the steps, in the order i) to iv): i) introduction of a gas stream d2′ having a composition corresponding to the recycle gas stream d2 in the operating phase into the dehydrogenation zone and setting of the recycle gas stream d2 to at least 70% of the total volume flow in the operating phase; ii) optionally additional introduction of a steam stream a3 into the dehydrogenation zone; iii) additional introduction of the feed gas stream a1 comprising butenes at a lower volume flow than in the operating phase and raising of this volume flow until at least 50% of the volume flow of the feed gas stream a1 in the operating phase has been attained, with the total gas flow through the dehydrogenation zone corresponding to not more than 120% of the total gas flow during the operating phase; iv) additional introduction, when at least 50% of the volume flow of the feed gas stream a1 comprising butenes in the operating phase has been attained, of an oxygen-comprising stream a2 at a lower volume flow than in the operating phase and raising of the volume flows of the feed gas streams a1 and a2 until the volume flows in the operating phase have been attained, with the total gas flow through the dehydrogenation zone corresponding to not more than 120% of the total gas flow during the operating phase.

公开(公告)号：US20220259131A1

公开(公告)日：2022-08-18

申请号：US17628897

申请日：2020-07-14

Applicant: BASF SE

Inventor： Kazuhiko AMAKAWA ,  Lukas SCHULZ ,  Michael BENDER ,  Klaus Joachim MUELLER-ENGEL ,  Christian WALSDORFF ,  Signe UNVERRICHT

IPC: C07C51/145 ,  C07C45/50 ,  B01J23/887 ,  B01J35/02

Abstract: A process for the continuous production of either acrolein or acrylic acid as the target product from propene comprising a catalyzed gas phase partial oxidation of propene to yield a product gas containing the target product, transferring the target product in a separating zone from the product gas into the liquid phase and conducting out of the separating zone a stream of residual gas the major portion of which is returned into the partial oxidation and the remaining portion of said stream is purged from the process as off-gas from which synthesis gas can be produced or which can be added to synthesis gas produced otherwise.