发明名称 METHOD FOR OBTAINING PURE ANILINE
摘要 The invention relates to a method for obtaining pure aniline by catalytically hydrogenating nitrobenzene and reprocessing the reaction mixture obtained therefrom, having the following method steps: - the catalytic hydrogenation of nitrobenzene; - optionally the partial condensation of the reaction mixture of the catalytic hydrogenation in one or more stages; - the separation of the reaction mixture obtained after the catalytic hydrogenation or the condensation, which is optionally carried out, into a gas phase, which contains hydrogen, and a liquid phase; - the liquid-liquid phase separation of the liquid phase obtained in the separation step, thereby obtaining an aqueous phase, which is further reprocessed or discharged, and raw analine as an organic phase, said raw analine containing 90-95 wt.% aniline, 4-9 wt.% water, and residual high boilers relative to the analine, in each case based on the total weight of the raw analine, and the sum of the components of the raw analine equaling 100 wt.%; and - the pre-cleaning of the raw analine by partly or completely separating the water via the head stream of a first distillation column, thereby obtaining a bottom stream that is fed as a feed stream to a purification column from which a pure aniline stream containing at least 99.9 wt.% aniline based on the total weight of the pure analine stream is drawn via the head and a bottom stream containing high boilers is drawn and fed to a combustion process. The invention is characterized in that the weight ratio of the bottom stream from the purification column is limited to maximally 0.8% relative to the weight of the feed stream, thereby ensuring that said bottom stream can be pumped under the effect of a corresponding trace heating of the lines provided for this purpose, said trace heating ensuring that the temperature of the stream conducted in the lines is 45 °C or higher, wherein the bottom stream is exposed to methanol, ethanol, propanol, acetone, or mixtures thereof in a weight ratio of 5-30% based on the weight of the bottom stream.
申请公布号 WO2014057053(A1) 申请公布日期 2014.04.17
申请号 WO2013EP71197 申请日期 2013.10.10
申请人 BASF SE 发明人 VANDEWALLE, KOENRAAD;VERCRUYSSE, KAREN;DENISSEN, LEO;DEBERDT, FILIP;DE WINNE, HENDRIK;VAN DE VOORDE, BART;REISER, MICHAEL;NETO, SAMUEL
分类号 C07C209/84;C07C211/46 主分类号 C07C209/84
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