Process for Preparing 1,3-Butadiene from N-Butenes by Oxidative Dehydrogenation
    11.
    发明申请
    Process for Preparing 1,3-Butadiene from N-Butenes by Oxidative Dehydrogenation 审中-公开
    通过氧化脱氢从N-丁烯制备1,3-丁二烯的方法

    公开(公告)号:US20140200380A1

    公开(公告)日:2014-07-17

    申请号:US14154558

    申请日:2014-01-14

    Applicant: BASF SE

    CPC classification number: C07C7/05 C07C5/48 C07C7/08 C07C7/11 C07C11/167

    Abstract: The invention relates to a process for preparing butadiene from n-butenes, which comprises the steps: A) provision of a feed gas stream a comprising n-butenes; B) introduction of the feed gas stream a comprising n-butenes and an oxygen-comprising gas into at least one oxidative dehydrogenation zone and oxidative dehydrogenation of n-butenes to butadiene, giving a product gas stream b comprising butadiene, unreacted n-butenes, water vapor, oxygen, low-boiling hydrocarbons, high-boiling secondary components, possibly carbon oxides and possibly inert gases; Ca) cooling of the product gas stream b by contacting with an organic solvent as coolant, Cb) compression of the product gas stream b in at least one compression stage, giving at least one aqueous condensate stream c1 and a gas stream c2 comprising butadiene, n-butenes, water vapor, oxygen, low-boiling hydrocarbons, possibly carbon oxides and possibly inert gases; D) separation of incondensable and low-boiling gas constituents comprising oxygen, low-boiling hydrocarbons, possibly carbon oxides and possibly inert gases as gas stream d2 from the gas stream c2 by absorption of the C4-hydrocarbons comprising butadiene and n-butenes in an absorption medium, giving an absorption medium stream loaded with C4 -hydrocarbons and the gas stream d2, and subsequent desorption of the C4-hydrocarbons from the loaded absorption medium stream to give a C4-product gas stream d1, E) separation of the C4 product stream d1 by extractive distillation using a solvent selective for butadiene into a stream e1 comprising butadiene and the selective solvent and a stream e2 comprising n-butenes; F) distillation of the stream f2 comprising butadiene and the selective solvent to give a stream g1 consisting essentially of the selective solvent and a stream g2 comprising butadiene.

    Abstract translation: 本发明涉及从正丁烯制备丁二烯的方法,其包括以下步骤:A)提供包含正丁烯的进料气流a; B)将包含正丁烯和含氧气体的进料气流a引入至少一个氧化脱氢区和将正丁烯氧化脱氢成丁二烯,得到包含丁二烯,未反应的正丁烯, 水蒸气,氧气,低沸点烃,高沸点次级组分,可能的碳氧化物和可能的惰性气体; Ca)通过与有机溶剂作为冷却剂接触来冷却产物气流b,Cb)在至少一个压缩级中压缩产物气流b,得到至少一种含水冷凝物流c1和包含丁二烯的气流c2, 正丁烯,水蒸气,氧气,低沸点烃,可能的碳氧化物和可能的惰性气体; D)通过吸收包含丁二烯和正丁烯的C 4烃在内,从气体流c2分离包含氧,低沸点烃,可能的碳氧化物和可能的惰性气体的不可冷凝和低沸点气体成分 吸收介质,得到负载有C4-烃和气流d2的吸收介质流,随后将C4-烃从负载的吸收介质流中解吸,得到C4-产物气流d1,E)C4产物的分离 通过使用对丁二烯选择性的溶剂进行萃取蒸馏,将其流入包含丁二烯和选择性溶剂的流e1和包含正丁烯的流e2; F)蒸馏包含丁二烯和选择性溶剂的料流f2,得到基本上由选择性溶剂组成的料流g1和包含丁二烯的料流g2。

    Process for the Oxidative Dehydrogenation of N-Butenes to Butadiene

    公开(公告)号:US20140200379A1

    公开(公告)日:2014-07-17

    申请号:US14150239

    申请日:2014-01-08

    Applicant: BASF SE

    CPC classification number: C07C5/48 C07C7/08 C07C7/11 C07C11/167

    Abstract: The invention relates to a process for preparing butadiene from n-butenes, which comprises the following steps: A) provision of a feed gas stream a comprising n-butenes; B) introduction of the feed gas stream a comprising n-butenes and an oxygen-comprising gas into at least one dehydrogenation zone and oxidative dehydrogenation of n-butenes to butadiene, giving a product gas stream b comprising butadiene, unreacted n-butenes, water vapor, oxygen, low-boiling hydrocarbons, possibly carbon oxides and possibly inert gases; C) cooling and compression of the product gas stream b in at least one compression stage, giving at least one condensate stream c1 comprising water and a gas stream c2 comprising butadiene, n-butenes, water vapor, oxygen, low-boiling hydrocarbons, possibly carbon oxides and possibly inert gases; D) separation of incondensable and low-boiling gas constituents comprising oxygen, low-boiling hydrocarbons, possibly carbon oxides and possibly inert gases as gas stream d2 from the gas stream c2 by Da) absorption of the C4-hydrocarbons comprising butadiene and n-butenes in a high-boiling absorption medium, giving an absorption medium stream loaded with C4-hydrocarbons and the gas stream d2, Db) removal of oxygen from the absorption medium stream loaded with C4-hydrocarbons by stripping with an inert gas and Dc) desorption of the C4-hydrocarbons from the loaded absorption medium stream to give a C4 product gas stream d1 which consists essentially of C4-hydrocarbons and comprises less than 100 ppm of oxygen; E) separation of the C4 product stream d1 by extractive distillation with a solvent which is selective for butadiene into a stream e1 comprising butadiene and the selective solvent and a stream e2 comprising n-butenes; F) distillation of the stream e1 comprising butadiene and the selective solvent to give a stream f1 consisting essentially of the selective solvent and a butadiene-comprising stream f2.

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