METHOD OF STARTING UP A REACTOR FOR THE OXIDATIVE DEHYDROGENATION OF N-BUTENES

• Main Authors: HAMMON ULRICH, WALSDORFF CHRISTIAN, BOELT HEINZ, ECKRICH RAINER, UNGELENK JAN, REYNEKE HENDRIK, WELLENHOFER ANTON, HAMMEN OLIVER, WENNING ULRIKE, UNVERRICHT SIGNE, TOEGEL CHRISTINE
• Format: Patent
• Language: Chinese; English
• Published: 04.06.2019
• Subjects: ACYCLIC OR CARBOCYCLIC COMPOUNDS; CHEMISTRY; METALLURGY; ORGANIC CHEMISTRY

Process for preparing butadiene from n-butylene, 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-butylene; B) introduction of the feed gas stream (a1) comprising n-butylene, 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-butylene to butadiene, giving a product gas stream (b) comprising butadiene; C) cooling and compression of the product gas stream (b), givingat 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