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1. 发明公开

EP1836146A1 VERFAHREN ZUR HERSTELLUNG VON PROPEN AUS PROPAN 有权
公开(公告)号：EP1836146A1
公开(公告)日：2007-09-26
申请号：EP06700188.3
申请日：2006-01-04
申请人： BASF AKTIENGESELLSCHAFT
发明人： CRONE, Sven , MACHHAMMER, Otto , SCHINDLER, Götz-Peter , BORGMEIER, Frieder
IPC分类号： C07C5/327 , C07C7/11 , C07C7/04
CPC分类号： C07C5/3337 , C07C7/11 , C07C11/06
摘要： A) A feed stream containing propane is prepared, B) the feed stream containing propane, optionally steam and optionally an oxygen-containing gas stream are fed to a dehydrogenation zone and propane undergoes a dehydrogenation to give propene, whereby a product gas stream b is obtained containing propane, propene, methane, ethane, ethene, carbon monoxide, carbon dioxide, steam, optionally hydrogen and optionally oxygen, C) the product gas stream b is cooled, optionally compressed and steam separated off by condensation, to give a product gas stream c stripped of steam, D) the product gas stream c is brought into contact with a selective inert absorption agent which selectively absorbs propene in a first absorption zone, to give an essentially propane-charged absorption agent stream d1 and a gas stream d2 containing propane, methane, ethane, ethene, carbon monoxide, carbon dioxide and hydrogen, E) the absorption agent stream d1 is optionally depressurised in a first desorption zone, to give an essentially propene-charged absorption agent stream e1 and a gas stream e2, containing propene, said gas stream e2 being recycled into the first absorption zone and F) a propene-containing gas stream f1 is released from the essentially propene-charged absorption agent stream d1 and e1 in at least one second desorption zone by depressurization, heating and/or stripping of the absorption agent stream d1 and e1 with recycling of the selective absorption agent.
摘要翻译： A）制备含有丙烷的进料流，B）将含有丙烷，任选的蒸汽和任选的含氧气流的进料流进料至脱氢区，并将丙烷脱氢生成丙烯，由此产物气流b为得到含有丙烷，丙烯，甲烷，乙烷，乙烯，一氧化碳，二氧化碳，蒸汽，任选的氢气和任选的氧气，C）将产物气流b冷却，任选压缩并通过冷凝分离出蒸汽，得到产物气体 d）将产物气流c与选择性吸收剂接触，所述选择性惰性吸收剂选择性吸收第一吸收区中的丙烯，得到基本上丙烷加入的吸收剂流d1和含有丙烷，甲烷，乙烷，乙烯，一氧化碳，二氧化碳和氢气，E）吸收剂料流d1任选地在第一解吸区中减压至g 基本上丙烯的吸收剂流e1和含丙烯的气流e2，所述气流e2被再循环到第一吸收区中，并且F）含丙烯的气流f1从基本上带丙烯的吸收剂释放在至少一个第二解吸区中通过吸收剂流d1和e1的减压，加热和/或汽提以及选择性吸收剂的再循环来产生流d1和e1。

2. 发明公开

EP1814834A1 VERFAHREN UND VORRICHTUNG ZUR VOLLHYDRIERUNG EINES KOHLENWASSERSTOFFSTROMES 审中-公开
标题翻译：方法和设备的完整加氢烃流
公开(公告)号：EP1814834A1
公开(公告)日：2007-08-08
申请号：EP05813743.1
申请日：2005-11-16
申请人： BASF AKTIENGESELLSCHAFT
发明人： SIMON, Falk , CRONE, Sven , SCHINDLER, Götz-Peter , FRITZ, Peter, Matthias , BÖLT, Heinz
IPC分类号： C07C5/327 , B01J8/08
CPC分类号： B01J8/02 , B01J19/0026 , B01J2208/00707 , B01J2219/00006 , C07C5/333 , C07C9/00
摘要： The invention relates to a method for hydrogenating material flows in systems for producing alkenes by catalytically dehydrogenating light alkanes, in addition to a device for carrying out said method. All of the unsaturated hydrocarbons contained in the entire hydrocarbon flow which is made of fresh and recycled alkane and which is to be introduced into the dehydrogenation reactor, are subjected to a complete hydrogenation before being introduced into the dehydrogenation reactor. As a result, the formation of coke in the dehydrogenation reactor is drastically reduced. Energy expenditure for preheating the educt flow to the reaction temperature is reduced such that energy released during exothermic hydrogenation remains almost completely in the hydrocarbon flow.

3. 发明公开

EP1701928A1 VERFAHREN ZUR HERSTELLUNG VON BUTADIEN 有权
标题翻译： PROCESS FOR产生丁二烯
公开(公告)号：EP1701928A1
公开(公告)日：2006-09-20
申请号：EP04804419.2
申请日：2004-12-30
申请人： BASF Aktiengesellschaft
发明人： JOHANN, Thorsten , SCHINDLER, Götz-Peter , BRODHAGEN, Andreas , CRONE, Sven , DUDA, Mark
IPC分类号： C07C5/333 , C07C11/167
CPC分类号： C07C5/333 , C07C5/48 , C07C11/167
摘要： The invention relates to a method for producing butadiene from n-butane, comprising the steps of A) providing an input gas flow a containing n-butane; B) feeding said input gas flow a containing n-butane into at least one first dehydrogenation zone and dehydrogenating n-butane in a non-oxidative catalytic manner, whereby a product gas flow b containing n-butane, 1-butene, 2-butene, butadiene, hydrogen, low-boiling secondary components, and optional steam is obtained; C) feeding the product gas flow b resulting from the non-oxidative catalytic dehydrogenation process and an oxygen-containing gas into at least one second dehydrogenation zone and oxidatively dehydrogenating 1-butene and 2-butene, whereby a product gas flow c containing n-butane, 2-butene, butadiene, hydrogen, low-boiling secondary components, and steam is obtained, said second product gas flow c having a higher butadiene content than product gas flow b; D) eliminating hydrogen, the low-boiling secondary components, and steam, whereby a C4 product gas flow d essentially comprising n-butane, 2-butene, and butadiene is obtained; E) feeding the C4 product gas flow d into a distillation zone and separating a butadiene/butane mixture as a valuable product flow e1 such that a flow e2 substantially comprising n-butane and 2-butene remains; F) redirecting flow e2 into the first dehydrogenation zone.

4. 发明公开

EP1615870A2 VERFAHREN DER HETEROGEN KATALYSIERTEN PARTIELLEN DIREKTEN OXIDATION VON PROPAN UND/ODER ISO-BUTAN ZU ACRYLSÄURE UND/ODER METHACRYLSÄURE 有权
标题翻译：过程用于丙烯酸和/或甲基丙烯酸丙烷和/或异丁烷非均相催化部分直接氧化
公开(公告)号：EP1615870A2
公开(公告)日：2006-01-18
申请号：EP04726111.0
申请日：2004-04-07
申请人： BASF Aktiengesellschaft
发明人： MACHHAMMER, Otto , CRONE, Sven , BORGMEIER, Frieder , MÜLLER-ENGEL, Klaus, Joachim , ADAMI, Christoph , DIEFENBACHER, Armin
IPC分类号： C07C57/05
CPC分类号： C07C51/215 , C07C57/04
摘要： Disclosed is a method for the heterogeneously catalyzed partial direct oxidation of propane and/or isobutane. According to said method, target product is separated from the product gas mixture obtained in the reaction stage in a reprocessing stage, the remaining product gas mixture is divided into two partial quantities having the same composition, one partial quantity is redirected into the reaction stage while the other partial quantity is discharged, and both the reaction stage and the reprocessing stage are operated at an increased pressure.

5. 发明公开

EP1833776A1 VERFAHREN ZUR HERSTELLUNG VON PROPEN AUS PROPAN 审中-公开
公开(公告)号：EP1833776A1
公开(公告)日：2007-09-19
申请号：EP05821810.8
申请日：2005-12-20
申请人： BASF AKTIENGESELLSCHAFT
发明人： MACHHAMMER, Otto , CRONE, Sven , SCHINDLER, Götz-Peter
IPC分类号： C07C5/333 , C07C11/06
CPC分类号： C07C5/3337 , C07C7/04 , C07C11/06
摘要： The invention relates to a method for the production of propene from propane comprising the steps: A) a feed gas stream containing propane is prepared, B) the feed gas stream containing propane a and an oxygen-containing gas stream are supplied to a dehydrogenation zone and propane is subjected to a non-oxidative catalytic autothermal dehydrogenation to give propene, whereby a product gas stream b containing propane, propene, methane, ethane, ethene, nitrogen, carbon monoxide, carbon dioxide, water vapour and hydrogen is obtained, C) the product gas stream b is cooled and water vapour separated off by condensation to give a product as stream c stripped of water vapour, D) non-condensable or low-boiling gas components are separated off by bringing the product gas stream c into contact with an inert absorption agent with subsequent desorption of the gases dissolved in the inert absorption agent, whereby a C3 hydrocarbon stream d1 and a waste-gas stream d2, containing methane, ethane, ethene, nitrogen, carbon monoxide, carbon dioxide and hydrogen are generated, E) the C3 hydrocarbon stream d1 is cooled and compressed, to give a liquid C3 hydrocarbon stream e1, F) the liquid C3 hydrocarbon stream e1 is fed to a first distillation zone and separated by distillation into a stream f1 containing propane and propene and a stream f2 containing ethane and ethene and G) the stream f1 is fed to a second distillation zone and separated by distillation into a product gas stream g1 of propene and a stream g2 of propane, whereby the stream g2 is at least partly recycled into the dehydrogenation zone.
摘要翻译：本发明涉及一种由丙烷生产丙烯的方法，其包括以下步骤：A）制备含有丙烷的进料气流，B）将含有丙烷a和含氧气流的进料气流供入脱氢区丙烷进行非氧化催化自热脱氢得到丙烯，由此得到含有丙烷，丙烯，甲烷，乙烷，乙烯，氮气，一氧化碳，二氧化碳，水蒸气和氢气的产物气流b，C）将产物气流b冷却并通过冷凝分离出水蒸汽，得到作为物流c的产物，汽提出水蒸气，D）通过使产物气流c与分离器接触，分离不可冷凝或低沸点气体组分惰性吸收剂，随后解吸溶解在惰性吸收剂中的气体，由此得到含有甲烷，乙烷，乙烯的C3烃物流d1和废气物流d2 产生一氧化碳，氮气，一氧化碳，二氧化碳和氢气，E）将C3烃物流d1冷却并压缩，得到液体C3烃物流e1，F）将液体C3烃物流e1进料到第一蒸馏区并通过蒸馏分离成含有丙烷和丙烯的料流f1和含有乙烷和乙烯的料流f2，和G）将料流f1供入第二蒸馏区并通过蒸馏分离成丙烯的产物气流g1和丙烷，由此将料流g2至少部分再循环到脱氢区中。

6. 发明公开

EP1841719A1 VERFAHREN ZUR HERSTELLUNG VON BUTADIEN AUS N-BUTAN 审中-公开
公开(公告)号：EP1841719A1
公开(公告)日：2007-10-10
申请号：EP06707724.8
申请日：2006-01-16
申请人： BASF AKTIENGESELLSCHAFT
发明人： KLANNER, Catharina , SCHINDLER, Götz-Peter , CRONE, Sven , BORGMEIER, Frieder , DUDA, Mark , SIMON, Falk
IPC分类号： C07C5/333 , C07C11/167
CPC分类号： C07C5/3337 , C07C7/08 , C07C11/167
摘要： The invention relates to a method for producing butadiene from n-butane comprising the following steps: A) provision of a feed gas stream (a) containing n-butane; B) introduction of the feed gas stream (a) containing n-butane into at least one first dehydrogenation zone and the non-oxidative catalytic dehydrogenation of n-butane to obtain a product gas stream (b) containing n-butane, 1-butene, 2-butene, butadiene, hydrogen, low-boiling minor constituents, optionally carbon oxides and optionally water vapour; C) introduction of the product gas stream (b) of the non-oxidative catalytic dehydrogenation and a gas containing oxygen into at least a second dehydrogenation zone and the oxidative dehydrogenation of n-butane, 1-butene and 2-butene to obtain a product gas stream (c) containing n-butane, 2-butene, butadiene, low-boiling minor constituents, carbon oxides and water vapour, said stream having a higher butadiene content than the product gas (b); D) isolation of the low-boiling minor constituents and the water vapour to obtain a C4 product gas stream (d), which essentially consists of n-butane, 2-butene and butadiene; E) separation of the C4 product gas stream (d) into a stream (e1), which essentially consists of n-butane and 2-butene and a useful product stream (e2), which essentially consists of butadiene, by extractive distillation; F) return of the stream (e1) to the first dehydrogenation zone.
摘要翻译：本发明涉及由正丁烷生产丁二烯的方法，包括以下步骤：A）提供含有正丁烷的进料气流（a）; B）将含有正丁烷的进料气流（a）引入至少一个第一脱氢区和正丁烷的非氧化催化脱氢以获得含有正丁烷，1-丁烯的产物气流（b），2-丁烯，丁二烯，氢，低沸点次要组分，任选的碳氧化物和任选的水蒸气; C）将非氧化催化脱氢的产物气流（b）和含氧气体引入至少第二脱氢区，并将正丁烷，1-丁烯和2-丁烯氧化脱氢以获得产物包含正丁烷，2-丁烯，丁二烯，低沸点次要组分，碳氧化物和水蒸气的气体物流（c），所述物流具有比产物气体（b）更高的丁二烯含量; D）分离低沸点次要组分和水蒸气以获得基本上由正丁烷，2-丁烯和丁二烯组成的C4产物气流（d）; E）通过萃取蒸馏将C4产物气流（d）分离成主要由正丁烷和2-丁烯组成的物流（e1）和主要由丁二烯组成的有用产物物流（e2）; F）将物流（e1）返回到第一脱氢区。

7. 发明公开

EP1831134A1 VERFAHREN ZUR HERSTELLUNG VON BUTADIEN AUS N-BUTAN 有权
公开(公告)号：EP1831134A1
公开(公告)日：2007-09-12
申请号：EP05821923.9
申请日：2005-12-19
申请人： BASF AKTIENGESELLSCHAFT
发明人： CRONE, Sven , KLANNER, Catharina , SCHINDLER, Götz-Peter , DUDA, Mark , BORGMEIER, Frieder
IPC分类号： C07C5/333 , C07C11/167
CPC分类号： C07C5/333 , C07C11/167
摘要： The invention relates to a method for producing butadiene from n-butane, comprising the following steps: A) providing a gas feedstream (a) containing n-butane; B) feeding the gas feedstream (a) containing n-butane to at least one first dehydrogenation zone and carrying out a non-oxidative, catalytic dehydrogenation of n-butane, thereby obtaining a gas stream (b) comprising n-butane, 1-butene, 2-butene, butadiene, hydrogen, optionally water vapor, optionally carbon monoxides and optionally inert gases; C) feeding the gas stream (b) and an oxygen-containing gas to at least one second dehydrogenation zone and carrying out an oxidative dehydrogenation of 1-butene and 2-butene, thereby obtaining a gas stream (c) comprising n-butane, butadiene, hydrogen, water vapor, optionally carbon monoxides and optionally inert gases; D) compressing, in at least one first compression step, and cooling the gas stream (c), thereby obtaining at least one condensate stream (d1) comprising water and a gas stream (d2) comprising n-butane, butadiene, hydrogen, water vapor, optionally carbon monoxides and optionally inert gases; E) separating the gas stream (d2) by extractive distillation into a product stream (e1) substantially consisting of butadiene and a stream (e2) comprising n-butane, hydrogen, water vapor, optionally carbon monoxides and optionally inert gases; F) optionally compressing, in one or more compression steps, and cooling the gas stream (e2), thereby obtaining at least one condensate stream (f1) comprising n-butane and water and a gas stream (f2) comprising n-butane, hydrogen, optionally carbon monoxides and optionally inert gases, and optionally redirecting the condensate stream (f1) to the first dehydrogenation zone; G) separating the gas stream (f2) into a recirculation stream (g1) comprising n-butane and a discharge stream (g2) comprising hydrogen, optionally carbon monoxides and optionally inert gases by contacting the gas stream (f2) with a high-boiling absorbent and finally desorbing the gaseous components dissolved in the absorbent.
摘要翻译：本发明涉及由正丁烷生产丁二烯的方法，其包括以下步骤：A）提供含有正丁烷的气体进料流（a）; B）将含正丁烷的气体进料流（a）送入至少一个第一脱氢区并进行正丁烷的非氧化性催化脱氢，从而得到包含正丁烷，1-丁烯，丁烯，2-丁烯，丁二烯，氢气，任选的水蒸气，任选的一氧化碳和任选的惰性气体; C）将气流（b）和含氧气体供给到至少一个第二脱氢区并进行1-丁烯和2-丁烯的氧化脱氢，从而获得包含正丁烷的气流（c）丁二烯，氢气，水蒸汽，任选的一氧化碳和任选的惰性气体; D）在至少一个第一压缩步骤中压缩并冷却气流（c），从而获得包含水和包含正丁烷，丁二烯，氢气，水的气流（d2）的至少一种冷凝物流（d1）蒸气，任选的一氧化碳和任选的惰性气体; E）通过萃取蒸馏将气流（d2）分离成基本上由丁二烯和包含正丁烷，氢气，水蒸气，任选的一氧化碳和任选的惰性气体的物流（e2）组成的产物流（e1） F）任选地在一个或多个压缩步骤中压缩并冷却气流（e2），从而获得包含正丁烷和水的至少一种冷凝物流（f1）和包含正丁烷，氢的气流（f2）任选的一氧化碳和任选的惰性气体，并且任选地将冷凝物流（f1）重新引导至第一脱氢区; G）通过将所述气流（f2）与高沸点气体（f2）接触将所述气流（f2）分离成包含正丁烷的再循环流（g1）和包含氢气，任选的一氧化碳和任选的惰性气体的排出流（g2）吸收剂并最终解吸溶解在吸收剂中的气体组分。

8. 发明公开

EP1812365A1 VERFAHREN ZUR HERSTELLUNG VON BUTADIEN AUS N-BUTAN 有权
标题翻译： PROCESS FOR制丁二烯由正丁烷
公开(公告)号：EP1812365A1
公开(公告)日：2007-08-01
申请号：EP05806496.5
申请日：2005-11-11
申请人： BASF AKTIENGESELLSCHAFT
发明人： CRONE, Sven , KLANNER, Catharina , SCHINDLER, Götz-Peter , DUDA, Mark , BORGMEIER, Frieder
IPC分类号： C07C5/333 , C07C11/167
CPC分类号： C07C7/09 , C07C5/333 , C07C11/167
摘要： The invention relates to a method for producing butadiene from n-butane, said method comprising the following steps: A) a feed gas flow (a) containing n-butane is prepared; B) the feed gas flow (a) containing n-butane is fed into at least one first dehydrogenating region and the n-butane is subjected to non-oxidative catalytic dehydrogenation, in order to obtain a gas flow (b) containing n-butane, 1-butene, 2-butene, butadiene, hydrogen, optionally carbon dioxide, and optionally water vapour; C) the gas flow (b) and a gas having an oxygen content of at least 75 vol. % are fed into at least one second dehydrogenating region and the 1-butene and 2-butene are subjected to oxidative dehydrogenation, in order to obtain a gas flow (c) containing n-butane, butadiene, hydrogen, and water vapour; D) the gas flow (c) is compressed in at least one first compression step and cooled, in order to obtain at least one condensate flow (d1) containing water and a gas flow (d2) containing n-butane, butadiene, hydrogen, carbon dioxide, and water vapour; E) the gas flow (d2) is compressed in at least one other compression step and cooled, in order to obtain at least one condensate flow (e1) containing n-butane, butadiene and water and a gas flow (e2) containing n-butane, butadiene, hydrogen and carbon dioxide; F) the gas flow (e2) is cooled, in order to obtain a condensate flow (f1) containing n-butane and butadiene and an exhaust gas flow (f2) containing carbon dioxide and hydrogen; G) water is separated from the at least one condensate flow (e1) and optionally the condensate flow (f1) during phase separation, in order to obtain at least one C4-hydrocarbon flow (g1) containing n-butane and butadiene and at least one waste water flow (g2); H) the C4-hydrocarbon flow (g1) is fractionated into a return flow (h1) containing n-butane and a product flow (h2) essentially consisting of butadiene, and the flow (h1) is redirected into the first dehydrogenating region.

9. 发明公开

EP1708978A1 VERFAHREN ZUR HERSTELLUNG VON BUTADIEN 有权
公开(公告)号：EP1708978A1
公开(公告)日：2006-10-11
申请号：EP04804421.8
申请日：2004-12-30
申请人： BASF Aktiengesellschaft
发明人： JOHANN, Thorsten , SCHINDLER, Götz-Peter , BRODHAGEN, Andreas , CRONE, Sven , BENFER, Regina , HILL, Thomas , DUDA, Mark
IPC分类号： C07C5/333 , C07C11/167
CPC分类号： C07C5/333 , C07C5/48 , C07C11/167
摘要： The invention relates to a method for producing butadiene from n-butane, comprising the steps of A) providing an input gas flow a containing n-butane; B) feeding said input gas flow a containing n-butane into at least one first dehydrogenation zone and dehydrogenating n-butane in a non-oxidative catalytic manner, whereby a product gas flow b containing n-butane, 1-butene, 2-butene, butadiene, hydrogen, low-boiling secondary components, and optional steam is obtained; C) feeding the product gas flow b resulting from the non-oxidative catalytic dehydrogenation process and an oxygen-containing gas into at least one second dehydrogenation zone and oxidatively dehydrogenating 1-butene and 2-butene, whereby a product gas flow c containing n-butane, 2-butene, butadiene, hydrogen, low-boiling secondary components, and steam is obtained, said second product gas flow c having a higher butadiene content than product gas flow b; D) eliminating hydrogen, the low-boiling secondary components, and steam, whereby a C4 product gas flow d essentially comprising n-butane, 2-butene, and butadiene is obtained; E) separating the C4 product gas flow d into a recirculation flow e1 essentially comprising n-butane and 2-butene and a flow e2 substantially comprising butadiene by means of extractive distillation, and redirecting flow e1 into the first dehydrogenation zone.
摘要翻译：本发明涉及由正丁烷生产丁二烯的方法，包括以下步骤：A）提供包含正丁烷的输入气流a; B）将所述含有正丁烷的输入气流a送入至少一个第一脱氢区，并以非氧化催化方式使正丁烷脱氢，由此产生含有正丁烷，1-丁烯，2-丁烯，丁二烯，氢气，低沸点次要组分和任选的蒸汽; C）将由非氧化催化脱氢方法得到的产物气流b和含氧气体送入至少一个第二脱氢区，并将1-丁烯和2-丁烯氧化脱氢，由此得到含n- 丁烷，2-丁烯，丁二烯，氢气，低沸点次要组分和蒸汽，所述第二产物气流c具有比产物气流b更高的丁二烯含量; D）除去氢气，低沸点次要组分和蒸汽，由此获得主要包含正丁烷，2-丁烯和丁二烯的C4产物气流d; E）通过萃取蒸馏将C4产物气流d分离成基本上包含正丁烷和2-丁烯的再循环流e1和基本上包含丁二烯的流e2，并将流e1重新引导到第一脱氢区中。

10. 发明公开

EP1708977A1 VERFAHREN ZUR HERSTELLUNG VON BUTADIEN UND 1-BUTEN 有权
标题翻译：用于生产丁二烯和1-丁烯
公开(公告)号：EP1708977A1
公开(公告)日：2006-10-11
申请号：EP04804420.0
申请日：2004-12-30
申请人： BASF Aktiengesellschaft
发明人： JOHANN, Thorsten , SCHINDLER, Götz-Peter , BRODHAGEN, Andreas , CRONE, Sven , BENFER, Regina , SIGL, Marcus , DUDA, Mark
IPC分类号： C07C5/333 , C07C11/167
CPC分类号： C07C5/327 , C07C5/333 , C07C5/48 , C07C11/167
摘要： The invention relates to a method for producing butadiene from n-butane, comprising the steps of A) providing an input gas flow a containing n-butane; B) feeding said input gas flow a containing n-butane into at least one first dehydrogenation zone and dehydrogenating n-butane in a non-oxidative catalytic manner, whereby a product gas flow b containing n-butane, 1-butene, 2-butene, butadiene, hydrogen, low-boiling secondary components, and optional steam is obtained; C) feeding the product gas flow b resulting from the non-oxidative catalytic dehydrogenation process and an oxygen-containing gas into at least one second dehydrogenation zone and oxidatively dehydrogenating 1-butene and 2-butene, whereby a product gas flow c containing n-butane, 2-butene, butadiene, hydrogen, low-boiling secondary components, and steam is obtained, said second product gas flow c having a higher butadiene content than product gas flow b; D) eliminating hydrogen, the low-boiling secondary components, and steam, whereby a C4 product gas flow d essentially comprising n-butane, 2-butene, and butadiene is obtained; E) separating the C4 product gas flow d into a recirculation flow e1 essentially comprising n-butane and 2-butene and a valuable product flow e2 substantially comprising butadiene by means of extractive distillation; F) feeding flow e1 essentially comprising n-butane and 2-butene as well as a circulating flow g containing 1-butene and 2-butene into a distillation zone and separating the same into a 1-butene-rich valuable product flow f1, a recirculation flow f2 containing 2-butene and n-butane, and a flow f3 containing 2-butene, and redirecting the recirculation flow f2 into the first dehydrogenation zone; G) feeding flow f3 containing 2-butene into an isomerization zone and isomerizing 2-butene to 1-butene, whereby a circulating flow g containing 1-butene and 2-butene is obtained, and redirecting the circulating gas flow g into the distillation zone.

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