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首页> 外国专利> Process for preparing cyclohexane from benzene and methylcyclopentane with upstream benzene hydrogenation

Process for preparing cyclohexane from benzene and methylcyclopentane with upstream benzene hydrogenation

机译：上游苯加氢由苯和甲基环戊烷制备环己烷的方法

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摘要

The present invention relates to a process for preparing cyclohexane from methylcyclopentane (MCP) and benzene. In the context of the present invention, MCP and benzene are constituents of a hydrocarbon mixture (HM1) additionally comprising dimethylpentanes (DMP), possibly cyclohexane and possibly at least one compound (low boiler) selected from acyclic C5-C6-alkanes and cyclopentane. First of all, benzene is converted in a hydrogenation step to cyclohexane (that present in the hydrocarbon mixture (HM2)), while MCP is isomerized in the presence of a catalyst, preferably of an acidic ionic liquid, to cyclohexane. After the hydrogenation but prior to the isomerization the dimethylpentanes (DMP) are removed, with initial removal of the cyclohexane present in the hydrocarbon mixture (HM2) together with DMP. This cyclohexane already present prior to the isomerization can be separated again from DMP in a downstream rectification step and isolated and/or recycled into the process for cyclohexane preparation. Between the DMP removal and MCP isomerization—if low boilers are present in the hydrocarbon mixture (HM1)—low boilers are, optionally removed. After the isomerization, the cyclohexane is isolated, optionally with return of unisomerized MCP and optionally of low boilers. Preferably, cyclohexane and/or low boilers are present in the hydrocarbon mixture (HM1), and so a low boiler removal is preferably conducted between the DMP removal from isomerization. It is additionally preferable that the removal of the cyclohexane from DMP is additionally conducted, meaning that the cyclohexane component which arises in the benzene hydrogenation and may be present in the starting mixture (HM1) is isolated and hence recovered.
机译：本发明涉及一种由甲基环戊烷（MCP）和苯制备环己烷的方法。在本发明的上下文中，MCP和苯是烃混合物（HM1）的成分，该烃混合物还包含二甲基戊烷（DMP），可能的环己烷和可能的至少一种选自无环C 5 -C 6 -烷烃和环戊烷。首先，苯在氢化步骤中转化为环己烷（存在于烃混合物（HM2）中），而MCP在催化剂（优选酸性离子液体）存在下异构化为环己烷。在氢化之后但在异构化之前，除去二甲基戊烷（DMP），首先除去与DMP一起存在于烃混合物（HM2）中的环己烷。在异构化之前已经存在的该环己烷可以在下游的精馏步骤中再次与DMP分离，并分离和/或循环到环己烷制备过程中。在DMP去除和MCP异构化之间（如果烃混合物（HM1）中存在低沸点化合物），则可以选择去除低沸点化合物。异构化之后，分离出环己烷，任选地返回未异构化的MCP和任选地低沸点化合物。优选地，在烃混合物（HM1）中存在环己烷和/或低沸点化合物，因此优选在异构化的DMP去除之间进行低沸点去除。另外优选的是另外进行从DMP中去除环己烷，这意味着分离并回收了在苯氢化中产生并可能存在于起始混合物（HM1）中的环己烷组分。

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