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发明授权
CN101941881B 通过甲基叔丁基醚裂解制备异丁烯 失效 - 权利终止 转让

通过甲基叔丁基醚裂解制备异丁烯
摘要：
本发明涉及一种通过MTBE裂解制备异丁烯的方法，其包括以下步骤：a)MTBE合成；b)MTBE的分离；c)MTBE裂解；d)异丁烯的分离；e)水的去除；f)再循环；本发明还涉及一种具有以下单元的管束式装置：i)管束，ii)管板，iii)挡板，iv)内壳，v)包含至少一个入口和出口的承压外壳，vi)包含放热或吸热流体的壳内空间，特征在于所述内壳与安装在所述管束长度上的所述挡板以及与所述管板不留间隙或只留一个小间隙地连接，存在于所述壳内空间中的所述流体在两侧包围所述内壳。
摘要（英）：

A process for preparing isobutene by dissociation of MTBE, including: a) reaction of isobutene-containing hydrocarbon mixtures, with methanol, present in one or more methanol-containing streams, over acidic ion exchangers to give a stream, containing MTBE and TBA; b) separation of a stream containing MTBE and TBA, from a stream by distillation; c) dissociation of a stream in the gas phase over a heterogeneous catalyst to give a stream containing at least isobutene, methanol, MTBE and water and possibly TBA, d) separation of a stream by distillation to give a stream containing in each case more than 50% by mass of the amounts of methanol, TBA and water present in another stream and a stream containing isobutene, e) separation of water from stream to below 1% by mass by distillation to give a stream, f) total or partial recirculation of the methanol-containing stream.

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