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91. 发明公开

EP2906519A4 FLEXIBLE BUTADIENE EXTRACTION PROCESS 有权转让
标题翻译：柔软的二氧化碳萃取过程
公开(公告)号：EP2906519A4
公开(公告)日：2016-06-01
申请号：EP13845575
申请日：2013-09-19
申请人： LUMMUS TECHNOLOGY INC
发明人： BRUMMER ROBERT JOHN , DWYER THOMAS ALEXANDER
IPC分类号： C07C7/04 , B01D3/14 , B01D3/40 , B01J19/24 , C07C11/167
CPC分类号： C07C7/005 , B01D3/141 , B01D3/143 , B01D3/40 , C07C7/04 , C07C7/08 , C07C7/10 , C07C11/167
摘要： A butadiene extraction processes designed for flexible operations, with or without a compressor, is disclosed. The ability to run at both high and low pressures provides added process flexibility.

92. 发明公开

EP3023148A1 METHOD FOR MANUFACTURING MULTI-COMPONENT COMPOSITE METAL OXIDE CATALYST 有权
标题翻译：制造多组分复合金属氧化物催化剂的方法
公开(公告)号：EP3023148A1
公开(公告)日：2016-05-25
申请号：EP15805738.0
申请日：2015-06-04
申请人： LG Chem, Ltd.
发明人： HWANG, Ye Seul , KO, Dong Hyun , CHA, Kyong Yong , CHOI, Dae Heung , SUH, Myung Ji , KANG, Jun Han , LEE, Joo Hyuck , NAM, Hyun Seok , HAN, Jun Kyu , HAN, Sang Jin
IPC分类号： B01J23/16 , B01J23/31 , B01J23/84 , B01J37/03 , B01J37/08 , C07C5/333 , C07C11/167
CPC分类号： C07C5/3332 , B01J23/002 , B01J23/881 , B01J23/8876 , B01J35/0006 , B01J35/002 , B01J37/03 , B01J37/031 , B01J37/035 , B01J37/04 , B01J37/08 , B01J37/088 , B01J2523/00 , C07C5/48 , C07C2523/31 , C07C2523/887 , B01J2523/13 , B01J2523/3712 , B01J2523/48 , B01J2523/54 , B01J2523/68 , B01J2523/842 , C07C11/167
摘要： The present invention relates to: a method for manufacturing a multi-component bismuth-molybdenum composite metal oxide catalyst, the method comprising a step of conducting first co-precipitation and second co-precipitation; and a multi-component bismuth-molybdenum composite metal oxide catalyst manufactured by the method. According to the manufacturing method, metal components constituting the catalyst are co-precipitated by two divided steps, the first co-precipitation and the second co-precipitation, and thus the catalyst can have a nearly identical structure to the conventional four-component bismuth-molybdenum catalyst, thereby suppressing the deterioration in catalytic activity due to the deformation of the catalyst structure, and the number of lattice oxygen atoms consumed during the reaction can be controlled to increase the catalytic activity, thereby reducing the generation of byproducts in a catalytic reaction process using the catalyst, particularly, in a catalytic reaction process under relatively low-temperature conditions, and improving the conversion rate of a reactant and the yield of a target product.
摘要翻译：本发明涉及：一种制造多组分铋 - 钼复合金属氧化物催化剂的方法，该方法包括进行第一次共沉淀和第二次共沉淀的步骤; 以及由该方法制造的多组分铋 - 钼复合金属氧化物催化剂。根据该制造方法，构成催化剂的金属成分通过第一次共沉淀和第二次共沉淀两个分步骤共沉淀，因此催化剂可以具有与常规的四组分铋 - 钼催化剂，从而抑制由于催化剂结构变形引起的催化活性的劣化，并且可以控制反应过程中消耗的晶格氧原子的数量以增加催化活性，从而减少催化反应过程中副产物的产生使用该催化剂，特别是在较低温度条件下的催化反应过程中，提高反应物的转化率和目标产物的收率。

93. 发明公开

EP3022168A1 VERFAHREN ZUR OXIDATIVEN DEHYDRIERUNG VON N-BUTENEN ZU 1,3-BUTADIEN 审中-公开
标题翻译： VERFAHREN ZUR氧化物DEHYDRIERUNG VON N-BUTENEN ZU 1,3-BUTADIEN
公开(公告)号：EP3022168A1
公开(公告)日：2016-05-25
申请号：EP14742192.9
申请日：2014-07-17
申请人： BASF SE
发明人： GRÜNE, Philipp , AVERLANT, Gauthier, Luc, Maurice , BALEGEDDE RAMACHANDRAN, Ragavendra, Prasad , JOSCH, Jan, Pablo
IPC分类号： C07C5/46 , B01J23/28 , B01J38/12 , B01J23/887 , C07C5/48
CPC分类号： C07C5/48 , B01J23/002 , B01J23/8878 , B01J23/8898 , B01J23/94 , B01J35/023 , B01J37/0045 , B01J37/0223 , B01J37/031 , B01J38/16 , B01J2523/00 , C07C7/11 , C07C2523/28 , C07C2523/887 , Y02P20/584 , C07C11/167 , B01J2523/13 , B01J2523/54 , B01J2523/67 , B01J2523/68 , B01J2523/842 , B01J2523/845
摘要： The invention relates to a method for oxidatively dehydrogenating n-butenes into 1,3-butadiene in a fixed-bed reactor (R), comprising at least two production steps (i) and at least one regeneration step (ii). In a production step (i), a starting gas mixture (1) containing the n-butenes is mixed with a gas (2) containing oxygen and is brought in contact with a heterogeneous, particulate multi-metal oxide catalyst, which contains molybdenum and at least one further metal as an active mass, in the fixed-bed reactor (R). In a regeneration step (ii), the heterogeneous, particulate multi-metal oxide catalyst, which contains molybdenum and at least one further metal as an active mass, is regenerated by passing a regenerating gas mixture containing oxygen over the multi-metal oxide catalyst and burning off the coke deposited on the multi-metal oxide catalyst. A regeneration step (ii) is performed between two production steps (i). In the production step (i), a product gas flow (6) is obtained in the fixed-bed reactor (R), which product gas flow contains 1,3-butadiene and also not yet reacted n-butenes, oxygen, water, and further secondary components, in particular carbon monoxide, carbon dioxide, inert gases, in particular nitrogen, high-boiling hydrocarbons, i.e., hydrocarbons having a boiling point of 95 °C or greater at a pressure of one atmosphere, possibly hydrogen, and possibly oxygenates and which product gas flow is fed to an absorption column (K) as such or, after one or more intermediate steps, as a flow (11), in which absorption column absorption is performed at a pressure in the range of 3.5 to 20 bar by means of a high-boiling absorbent (13), which loads itself with the C4 hydrocarbons from the product gas flow (6) or the flow (11) and is drawn from the bottom of the absorption column (K) as a loaded solvent flow (14), a top flow (12) thus being obtained, which contains oxygen, low-boiling hydrocarbons, i.e., hydrocarbons having a boiling point of less than 95 °C at a pressure of one atmosphere, remainders of C4 hydrocarbons, remainders of high-boiling hydrocarbons, i.e., hydrocarbons having a boiling point of 95 °C or greater at a pressure of one atmosphere, possibly inert gases, in particular nitrogen, possibly carbon oxides, and possibly water vapor and which is partially or completely recycled into the fixed-bed reactor (R) as a return flow. The method is characterized in that supply of the gas (2) containing oxygen to the reactor (R) is throttled or shut off at the end of each production step (i), and the production step (i) is continued until the oxygen concentration in the top flow (12) decreases to 5 vol. % with respect to the total volume of the top flow (12), whereupon the supply of the gas flow (1) containing the n-butenes is shut off, and also the supply of the gas (2) containing oxygen is shut off, if the supply of the gas containing oxygen was not already shut off at the end of the production step (i), whereby the production step (i) is ended and the regeneration step (ii) is started, in that the top flow (12) from the absorption column (K) acts as an oxygen-containing regenerating gas mixture or partial flow of the oxygen-containing regenerating gas mixture.
摘要翻译：在固定床反应器（R）中将正丁烯氧化脱氢为1,3-丁二烯的方法，其包含至少两个生产步骤（i）和至少一个再生步骤（ii），其中在制备步骤（i）将包含正丁烯的起始气体混合物（1）与含氧气体（2）混合，并与包含钼和至少一种其它金属的非均相颗粒状多金属氧化物催化剂在固定床反应器（R）中的活性组合物和在再生步骤（ii）中，包含钼和至少一种另外的金属作为活性组合物的非均相颗粒多金属氧化物催化剂通过使含氧再生气体混合物通过并且燃烧沉积在多金属氧化物催化剂上的碳质材料，其中在两个制备步骤（i）之间进行再生步骤（ii），并且其中包含1,3-丁二烯和添加剂的产物气流（6）未反应的正丁烯，氧，水和其它次要组分，特别是一氧化碳，二氧化碳，惰性气体，特别是氮气，高沸点烃，即沸点为95℃或更高的烃在固定床反应器（R）中的制备步骤（i）中可以获得一个气氛，任选地为氢气和任选的含氧化合物，并且如此进料或在作为流（11）的一个或多个中间步骤之后进料到吸收塔（K ），其中通过高沸点吸收介质（13）在3.5至20巴的压力下进行吸收，所述高沸点吸收介质（13）从产物气流（6）或流（11），并从吸收塔（K）的底部作为负载溶剂流（14）取出，得到包含氧的低沸点烃（即沸点小于95℃的烃）的塔顶馏出物（12）在一个大气压的压力下， C4烃，高沸点烃的残留物，即在一个大气压下沸点为95℃或更高的烃，任选的惰性气体，特别是氮，任选的碳氧化物和任选的水蒸气，部分地是或作为循环物流完全再循环到固定床反应器（R）中，其中在每个生产步骤（i）结束时，将含氧气体（2）引入反应器（R）中被节流回或关闭并且生产步骤（i）继续进行，直到塔顶馏出物（12）中的氧浓度基于塔顶馏出物（12）的总体积减少至5体积％，然后引入气流如果在生产步骤（i）结束时还没有完成包含正丁烯并且还引入含氧气体（2），那么生产步骤（i））完成，再生步骤（ii）由开销开始提出了从作为含氧再生气体混合物或含氧再生气体混合物的子流起作用的吸收塔（K）的物流（12）。

94. 发明公开

EP2993164A1 Phenolische (Thio)Acetale als Inhibitoren der Polymerisation von olefinisch ungesättigten Monomeren 有权
标题翻译：酚（硫代）缩醛作为烯属不饱和单体的聚合反应的抑制剂
公开(公告)号：EP2993164A1
公开(公告)日：2016-03-09
申请号：EP14183918.3
申请日：2014-09-08
申请人： Evonik Degussa GmbH
发明人： Nissen, Felix , Rinker, Stefanie , James, Phillip R. , Erpeldinger, Oliver , Neumann, Manfred , Kraushaar, Frank
IPC分类号： C07C7/20 , C08F2/40
CPC分类号： C07C7/20 , C07C17/42 , C07C45/86 , C07C51/50 , C07C67/62 , C07C231/22 , C07C253/32 , C08F2/40 , C07C15/46 , C07C11/04 , C07C11/06 , C07C11/08 , C07C11/167 , C07C15/44 , C07C11/20 , C07C11/18 , C07C13/15 , C07C69/15 , C07C69/54 , C07C57/04 , C07C47/22 , C07C21/06 , C07C21/21 , C07C255/08 , C07C233/03
摘要： Diese Erfindung betrifft ein Verfahren zur Inhibierung der Polymerisation von mindestens einem olefinisch ungesättigten Monomer mit mindestens einem phenolischen (Thio)Acetal. Diese Erfindung betrifft außerdem eine Zusammensetzung umfassend mindestens ein olefinisch ungesättigtes Monomer und mindestens ein phenolisches (Thio)Acetal in einem bestimmten Gewichtsverhältnis.
摘要翻译：本发明涉及一种方法，用于抑制具有至少一种酚类（硫代）缩醛的至少一种烯属不饱和单体的聚合。本发明还涉及包括在一定的重量比的至少一种烯属不饱和单体和至少一种酚类（硫代）缩醛的组合物。

95. 发明公开

EP2971255A1 DEVICE AND METHOD FOR ARYL-ALKYL COUPLING USING DECARBOXYLATION 审中-公开
标题翻译： VORRICHTUNG UND VERFAHREN ZUR ARYL-ALKYL-KOPPLUNG MITTELS DECARBOXYLIERUNG
公开(公告)号：EP2971255A1
公开(公告)日：2016-01-20
申请号：EP14762729.3
申请日：2014-03-14
申请人： Ceramatec, Inc
发明人： MOSBY, James , BHAVARAJU, Sai , MCGUIRE, Patrick , KARANJIKAR, Mukund
IPC分类号： C25B3/10 , C25B9/08 , C07C6/04
CPC分类号： C07C1/24 , C10M105/06 , C10M109/02 , C10M2203/065 , C10M2205/223 , C10N2270/00 , C25B1/10 , C25B3/02 , C25B3/10 , C25B9/08 , C25B13/02 , Y02E60/366 , C07C11/167 , C07C15/46
摘要： A method for alkylating aromatic compounds is described using an electrochemical decarboxylation process. This process produces aryl-alkyl compounds that have properties useful in Group V lubricants (and other products) from abundant and economical carboxylic acids. The process presented here is also advantageous as it is conducted at moderate temperatures and conditions, without the need of a catalyst. The electrochemical decarboxylation has only H2 and CO2 as its by-products, as opposed to halide by-products.
摘要翻译：使用电化学脱羧法描述芳族化合物的烷基化方法。这一过程产生具有在从丰富和经济的羧酸V族润滑剂（及其他产品）有用的性质的芳烷基化合物。这里提出的方法也是有利的，因为它是在中等温度和条件下进行，而不需要催化剂。电化学脱羧仅具有H 2和CO 2作为其副产物，而不是副产物卤化物。

96. 发明公开

EP2817096A4 OXIDATIVE DEHYDROGENATION OF OLEFINS CATALYST AND METHODS OF MAKING AND USING THE SAME 审中-公开
标题翻译：烯烃催化剂和方法氧化脱氢用于生产和使用
公开(公告)号：EP2817096A4
公开(公告)日：2016-01-20
申请号：EP13752032
申请日：2013-02-13
申请人： SAUDI BASIC IND CORP
发明人： TENNYSON REGINALD LAMONT
IPC分类号： B01J37/08 , B01J23/75 , B01J37/03
CPC分类号： B01J27/138 , B01J23/002 , B01J23/80 , B01J37/0045 , B01J37/031 , B01J37/10 , B01J2523/00 , C07C5/48 , C07C2521/02 , C07C2521/06 , C07C2523/02 , C07C2523/80 , C07C2523/83 , C07C2523/847 , C07C2523/887 , C07C2523/888 , C07C2523/889 , C07C2523/89 , C07C2527/18 , B01J2523/22 , B01J2523/23 , B01J2523/27 , B01J2523/842 , B01J2523/845 , C07C11/167
摘要： A method of making a dehydrogenation catalyst can comprise: combining precursors in water to form a mixture; adding base to the mixture to form a slurry having a pH of 7 to 8.5; aging the slurry at a temperature of greater than or equal to 40° C. while agitating; filtering a precipitate from the aged slurry to collect a catalyst precursor; drying and calcining the catalyst precursor to form the catalyst; wherein the catalyst has the formula (I) FeZnaCobMgcCadCleMfOx (I) wherein the amounts are in mole ratios relative to 1 mole of iron, "a" is 0.07 to 0.7 moles; "b" is 0.01 to 0.20 moles; "c" is less than or equal to 0.40 moles; "d" is less than or equal to 0.40 moles; "e" is less than or equal to 0.10 moles; "f" is less than or equal to 0.20 moles, and wherein greater than about 88% of the initial zinc is recovered.

97. 发明公开

EP2952498A1 Dehydration of 2,3-butanediole 审中-公开
标题翻译： Dehydratisierung von 2,3-Butandiol
公开(公告)号：EP2952498A1
公开(公告)日：2015-12-09
申请号：EP14180473.2
申请日：2014-08-11
申请人： LANXESS Deutschland GmbH
发明人： Gottlieb, Nadine , Dreisbach, Claus , Schlenk, Stefan
IPC分类号： C07C1/24 , B01J27/18
CPC分类号： C07C1/24 , B01J27/1806 , B01J37/031 , B01J37/06 , C07C2527/167 , C07C11/167
摘要： The present invention is directed to the dehydration of 2,3-butanediole to butadiene using as catalysts mixed alkaline earth metal phosphates or pyrophosphates or lithium alkaline earth phosphates or pyrophosphates.
摘要翻译：本发明涉及使用混合碱土金属磷酸盐或焦磷酸盐或碱土金属锂磷酸盐或焦磷酸盐作为催化剂将2,3-丁二烯脱水成丁二烯。

98. 发明公开

EP2945923A1 VERFAHREN ZUR OXIDATIVEN DEHYDRIERUNG VON N-BUTENEN ZU BUTADIEN 有权
公开(公告)号：EP2945923A1
公开(公告)日：2015-11-25
申请号：EP14700646.4
申请日：2014-01-15
申请人： BASF SE
发明人： JOSCH, Jan Pablo , WECK, Alexander , GIESA, Sonja , BÜTEHORN, Steffen , BALEGEDDE RAMACHANDRAN, Ragavendra Prasad , BENFER, Regina , WEBER, Markus
IPC分类号： C07C5/48 , C07C7/00 , C07C7/08 , C07C7/11 , C07C7/05 , C07C11/167
CPC分类号： C07C5/48 , C07C7/005 , C07C7/05 , C07C7/08 , C07C7/11 , C07C2523/887 , C07C11/167
摘要： The invention relates to a method for producing butadine from n-butenens, consisting of the following steps: A) a feed gas flow (a) containing n-butenes is provided; B) the feed gas flow (a) containing n-butenes and an oxygen-containing gas is fed to at least one dehydrogenation area and is oxidatively dehydrogenated from n-butenes to form butadiene; a product gas flow (b) containing butadiene, unreacted n-butenes, water vapour, oxygen, low-boiling hydrocarbons, optionally carbon oxides and optionally inert gases is obtained; C) the product gas flow (b) is cooled and compressed in at least compression step; at least one condensate flow (c1) containing water and a gas flow (c2) containing butadiene, n-butenes, water vapour, oxygen, low-boiling hydrocarbons, optionally carbon oxides and optionally inert gases is obtained; D) non-condensable and low-boiling gas component parts containing oxygen, low-boiling hydrocarbons, optionally carbon oxides and optionally inert gases are separated from the gas flow (c2) by Da) absorbing C4-hydrocarbons containing butadiene and n-butenes in absorption means boiling at a high temperature, wherein an absorption agent flow charged with C4-hydrocarbons and the gas flow (d2) are obtained, Db) the oxygen is removed from the absorption agent flow charged with the C4-hydrocarbon by stripping with the inert gas, and Dc) the C
4 hydrocarbons are desorbed from the charged absorption agent flow and a C
4 -product gas flow (d1), which consists essentially of C
4 -hydrocarbons and has less that 100ppm oxygen, is obtained. E) the C4-product flow (d1) is separated by extractive distillation using a selected solvent for butadiene in a butadiene and the material flow (e1) containing the selective solvent and a material flow (e2) containing n-butenes; F) the butadiene and the material flow (e1) containing the selective solvent is distilled in a material flow (f1) consisting essentially of the selective solvent and a material flow (f2) containing a butadiene.
摘要翻译：本发明涉及由正丁烯制备丁二烯的方法，其由以下步骤组成：A）提供含有正丁烯的原料气流（a）; B）将含有正丁烯和含氧气体的进料气流（a）供入至少一个脱氢区并从正丁烯氧化脱氢形成丁二烯; 得到包含丁二烯，未反应的正丁烯，水蒸气，氧气，低沸点烃，任选的碳氧化物和任选的惰性气体的产物气流（b）; C）产品气流（b）至少在压缩步骤中被冷却和压缩; 获得至少一种含水和含丁二烯，正丁烯，水蒸气，氧气，低沸点烃，任选的碳氧化物和任选的惰性气体的气流（c2）的冷凝物流（c1） D）将含有氧，低沸点烃，任选碳氧化物和任选惰性气体的不可冷凝和低沸点气体组分部分从气流（c2）中分离出来，Da）将含有丁二烯和正丁烯的C4-烃在高温下沸腾的吸收装置，其中获得装有C4-烃的吸收剂流和气流（d2），Db）通过用惰性溶剂汽提从装有C4-烃的吸收剂流中除去氧气气体和Dc），C 4烃从加入的吸收剂流中解吸并获得基本上由C 4烃组成且具有小于100ppm氧的C 4产物气流（d 1）。 E）使用用于丁二烯中丁二烯的选定溶剂的萃取蒸馏和含有选择性溶剂和含有正丁烯的物料流（e2）的物料流（e1）通过萃取蒸馏分离C4-产物流（d1） F）将丁二烯和含有选择性溶剂的物流（e1）在基本上由选择性溶剂组成的物流（f1）和含丁二烯的物流（f2）中蒸馏。

99. 发明公开

EP2945922A1 VERFAHREN ZUR HERSTELLUNG VON 1,3-BUTADIEN AUS N-BUTENEN DURCH OXIDATIVE DEHYDRIERUNG 审中-公开
标题翻译： PROCESS FOR通过氧化脱氢制从正丁烯-1,3-丁二烯
公开(公告)号：EP2945922A1
公开(公告)日：2015-11-25
申请号：EP14700500.3
申请日：2014-01-15
申请人： BASF SE
发明人： JOSCH, Jan Pablo , GRÜNE, Philipp , WALSDORFF, Christian , HAMMEN, Oliver , BALEGEDDE RAMACHANDRAN, Ragavendra Prasad
IPC分类号： C07C5/48 , C07C7/00 , C07C7/08 , C07C7/11 , C07C11/167
CPC分类号： C07C5/48 , C07C7/005 , C07C7/08 , C07C7/11 , C07C2523/887 , C07C11/167
摘要： The invention relates to a method for producing butadiene from n-butenens, comprising the following steps: A) a feed gas flow (a) containing n-butenes is provided; B) the feed gas flow (a) containing n-butenes and an oxygen-containing gas is fed to at least one oxidative dehydrogenation area and is oxidatively dehydrogenated from n-butenes to form butadiene; a product gas flow (b) containing butadiene, unreacted n-butenes, water vapour, oxygen, low-boiling hydrocarbons, auxiliary components boiling at a hgh temperature and optionally carbon oxides and optionally inert gases is obtained; Ca) the product gas flow (b) is cooled by bringing it into contact with an organic solvent as a cooling agent, Cb) the product gas flow (b) is compressed in at least one compression step and at least one aqueous condensate flow (c1) and a gas flow (c2) containing butadiene, n-butenes, water vapour, oxygen, low-boiling hydrocarbons, optionally carbon oxides and optionally inert gases is obtained; D) non-condensable and low-boiling gas component parts containing oxygen, low-boiling hydrocarbons, optionally carbon oxides and optionally inert gases are separated as a gas flow (d2) from the gas flow (c2) by absorbing C4-hydrocarbons containing butadiene and n-butenes in absorption means, an absorption agent flow charged with C4-hydrocarbons and the gas flow (d2) are obtained, and subsequently the C4 hydrocarbons are desorbed from the charged absorption agent flow and a C4 -product gas flow (d1) is obtained; E) the C4-product flow (d1) is separated by extractive distillation using a selected solvent for butadiene in a butadiene and the material flow (e1) containing the solvent selective and a material flow (e2) containing a n-butene; F) the butadiene and material flow (e1) containing the selective solvent is distilled in a material flow (f1) consisting essentially of the selective solvent and a material flow (f2) containing a butadiene.

100. 发明公开

EP2831021A4 IMPROVED CONTROLLABILITY OXIDATIVE DEHYDROGENATION PROCESS FOR PRODUCING BUTADIENE 有权
标题翻译：过程具有改进的可控丁二烯生产脱水氧化
公开(公告)号：EP2831021A4
公开(公告)日：2015-11-18
申请号：EP13768548
申请日：2013-03-28
申请人： TPC GROUP LLC
发明人： CACIULA LIANA , DUFF JOSEPH G , CHADA SIRISHA , BALLARD ELIZABETH , MCFARLAND CECIL G
IPC分类号： C07C11/16 , B01J19/24 , B01J23/745 , B01J23/889 , C07C5/48
CPC分类号： B01J19/24 , B01J23/8892 , B01J27/187 , B01J2219/00103 , B01J2219/24 , B01J2523/00 , C07C5/09 , C07C5/48 , C07C7/005 , C07C2523/745 , C07C2523/80 , C07C2527/185 , Y02P20/51 , C07C11/167 , B01J2523/23 , B01J2523/27 , B01J2523/51 , B01J2523/72 , B01J2523/842
摘要： Butadiene is made from a butene rich feed by passing a superheated butene rich feed including superheated steam and oxygen at a temperature of at least about 343° C. (650° F.) over a catalyst bed having a depth of over about 69 cm (27 inches) of granules of ferritic oxidative dehydrogenation catalyst. Inlet conditions being controlled such that the oxidative dehydrogenation reactions initially occur in the lower most layers of catalyst. Process control includes monitoring the temperature throughout the bed and increasing the inlet temperature in response to a drop in the temperature in the active layer, when the active layer of oxidative dehydrogenation catalyst begins to become deactivated so that the reaction zone moves upwardly in the oxidative dehydrogenation bed.

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