Processes for the preparation of aziridine compounds and vapor-phase reaction processes
申请人:NIPPON SHOKUBAI CO., LTD.
公开号:US20020055642A1
公开(公告)日:2002-05-09
In order to carry out various vapor-phase reactions (e.g., the preparation of aziridine compounds by a vapor-phase intramolecular dehydration reaction) with industrial advantages, there is provided a process which can effectively prevent the adhesion of tarry matter to piping and the like. This process is applicable, for example, to the preparation of aziridine compounds by using a reactor for carrying out the vapor-phase intramolecular dehydration reaction of an alkanolamine, a collection column for collecting an aziridine compound present in the reaction gas, and a distillation column for distilling the collector liquid to obtain a purified aziridine compound, and is characterized in that at least the piping section extending from the outlet of the reactor to the inlet of the collection column is maintained at a temperature which is not lower than 200° C., or in that the reaction gas is brought into contact with a collector prior to its introduction into the collection column.
为了以具有工业优势的方式进行各种气相反应(例如通过气相分子内脱水反应制备氮丙啶化合物),提供了一种可有效防止管道等附着焦油物质的工艺。例如,该工艺适用于通过以下装置制备氮丙啶化合物:一个用于进行烷醇胺气相分子内脱水反应的反应器,一个用于收集反应气体中的氮丙啶化合物的收集塔,以及一个用于蒸馏收集液以获得纯化氮丙啶化合物的蒸馏塔,其特征在于,至少从反应器出口延伸至收集塔入口的管道部分保持在不低于 200°C 的温度下、或反应气体在进入收集塔之前与收集器接触。