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PREPARATION OF BUTADIENE BY OXIDATIVE DEHYDROGENATION OF N-BUTENE AFTER PRIOR ISOMERIZATION

机译:先异构化后N-丁烯的氧化脱氢制备丁二烯

摘要

The invention relates to a method for preparing 1,3-butadiene by heterogeneously catalyzed oxidative dehydrogenation of n-butene, wherein a butene mixture is provided that contains at least 2-butene. The problem addressed by the invention is to provide a method for economic production of 1,3-butadiene on a large industrial scale, being provided with a butene mixture as raw material having a 1-butene content therein that is relatively low in comparison to the 2-butene content and wherein the ratio of 1-butene to 2-butene is subject to fluctuations. The solution to this problem is achieved by a two-step procedure, wherein in a first step the provided butene mixture is subjected to a heterogeneously catalyzed isomerization, obtaining an at least partially isomerized butene mixture, and wherein subsequently in a second step the at least partially isomerized butene mixture obtained in the first step is subjected to oxidative dehydrogenation. The two-step process results in higher butadiene yields compared to the one-step process.
机译:本发明涉及一种通过多相催化正丁烯的氧化脱氢制备1,3-丁二烯的方法,其中提供了一种至少包含2-丁烯的丁烯混合物。本发明解决的问题是提供一种经济的大规模工业生产1,3-丁二烯的方法,该方法提供有丁烯混合物作为原料,其中1-丁烯含量比原料中的1-丁烯含量低。 2-丁烯含量和其中1-丁烯与2-丁烯之比容易波动。该问题的解决方案通过两步法实现,其中在第一步中,将所提供的丁烯混合物进行多相催化异构化,获得至少部分异构化的丁烯混合物,其中随后在第二步中将至少将第一步获得的部分异构化的丁烯混合物进行氧化脱氢。与一步法相比,两步法可提高丁二烯收率。

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