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发明公开
EP3197851A1 VERFAHREN ZUR HERSTELLUNG VON 1,3-BUTADIEN AUS N-BUTENEN DURCH OXIDATIVE DEHYDRIERUNG 审中-公开

VERFAHREN ZUR HERSTELLUNG VON 1,3-BUTADIEN AUS N-BUTENEN DURCH OXIDATIVE DEHYDRIERUNG
摘要：
The invention relates to a process for preparing butadiene from n-butenes, comprising the steps of: A) providing an input gas stream (a) comprising n-butenes, B) feeding the input gas stream (a) comprising n-butenes and a gas containing at least oxygen into at least one oxidative dehydrogenation zone and oxidatively dehydrogenating n-butenes to butadiene, wherein a product gas stream (b) comprising butadiene, unconverted n-butenes, water vapour, oxygen, low-boiling hydrocarbons and high-boiling secondary components, optionally carbon oxides and optionally inert gases is obtained; Ca) cooling the product gas stream (b) by bringing into contact with a cooling medium in at least one cooling zone, the cooling medium being at least partly recycled and having an aqueous phase and an organic phase ; Cb) compressing the cooled product gas stream (b) which may have been depleted of high-boiling secondary components in at least one compression stage, giving at least one aqueous condensate stream (c1) and one gas stream (c2) comprising butadiene, n-butenes, water vapour, oxygen and low-boiling hydrocarbons, optionally carbon oxides and optionally inert gases; D) removing uncondensable and low-boiling gas constituents comprising oxygen and low-boiling hydrocarbons, with or without carbon oxides and with or without inert gases, as gas stream (d2) from the gas stream (c2) by absorbing the C
4 hydrocarbons comprising butadiene and n-butenes in an absorbent, giving an absorbent stream laden with C
4 hydrocarbons and the gas stream (d2), and then desorbing the C
4 hydrocarbons from the laden absorbent stream, giving a C
4 product gas stream (d1), E) separating the C
4 product stream (d1) by extractive distillation with a butadiene-selective solvent into a stream (e1) comprising butadiene and the selective solvent and a stream (e2) comprising n-butenes; F) distilling the stream (e1) comprising butadiene and the selective solvent into a stream (f1) consisting essentially of the selective solvent and a stream (f2) comprising butadiene, charactersied in that step Cb) comprises at least two compression stages Cba) and at least two cooling stages Cbb), which are designed as quench columns, in the cooling stage, the cooling takes place by bringing into direct contact with the two phase cooling medium having an aqueous and an organic phase.
摘要（中）：

本发明涉及由正丁烯制备丁二烯的方法，其包括以下步骤：A）提供包含正丁烯的输入气流（a），B）将包含正丁烯的输入气流（a）和 将至少含氧的气体送入至少一个氧化脱氢区并将正丁烯氧化脱氢成丁二烯，其中产物气流（b）包含丁二烯，未转化的正丁烯，水蒸气，氧气，低沸点烃和高沸点 获得次要组分，任选的碳氧化物和任选的惰性气体; Ca）通过在至少一个冷却区中与冷却介质接触来冷却产物气流（b），冷却介质至少部分地再循环并且具有水相和有机相; Cb）压缩在至少一个压缩阶段中可能已经耗尽高沸点次要组分的冷却产物气流（b），得到至少一种含水冷凝物流（c1）和一种包含丁二烯的气体流（c2），n 丁烯，水蒸汽，氧气和低沸点烃，任选的碳氧化物和任选的惰性气体; D）通过吸收包含丁二烯的C4烃作为来自气流（c2）的气流（d2），从气体流（c2）中除去含有氧气和低沸点烃的含有或不含有碳氧化物和有或没有惰性气体的不可冷凝和低沸点气体成分 和正丁烯在吸收剂中反应，产生充满C4烃和气体物流（d2）的吸收剂物流，然后从装载的吸收剂物流中解吸出C4烃，得到C4产物气流（d1），E） C4产物流（d1）通过用丁二烯选择性溶剂萃取蒸馏到包含丁二烯和选择性溶剂的物流（e1）和包含正丁烯的物流（e2）中; F）将包含丁二烯和选择性溶剂的物流（e1）蒸馏成基本上由选择性溶剂组成的物流（f1）和包含丁二烯的物流（f2），其特征在于该步骤Cb）包括至少两个压缩阶段Cba）和 在冷却阶段中设计为骤冷塔的至少两个冷却阶段Cbb）通过与具有水相和有机相的两相冷却介质直接接触而进行冷却。

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