The present invention relates to a method for producing a high purity, high quality amide compound, particularly, lactam. A first embodiment of the present invention is characterized in that an amount of each of a halide, an aldehyde compound, an alcohol compound and a nitrile compound contained in a solution recycled into an oxime-forming step is controlled to an amount of 0.4 mol % or less based on the ketone as a starting material. A second embodiment of the present invention is characterized in that one or more compounds selected from the group consisting of a ketone, an oxime and an amide compound are purified by hydrogenation and/or crystallization for eliminating impurities containing a double bond. A third embodiment of the present invention is characterized in that a content of impurities having a cyclic bridge structure is controlled by using a cycloalkanone purified by recrystallization.
本发明涉及一种生产高纯度、高质量酰胺化合物的方法,特别是内酰胺。本发明的第一实施例的特征在于,通过控制溶液中每种卤化物、醛类化合物、
醇类化合物和
腈类化合物在回收至
肟形成步骤中的含量,使其量不超过以酮为起始物的0.4摩尔%。本发明的第二实施例的特征在于,通过氢化和/或结晶净化从酮、
肟和酰胺化合物组成的化合物中选择一种或多种,以消除含有双键的杂质。本发明的第三实施例的特征在于,通过使用通过再结晶纯化的
环戊酮来控制具有环桥结构的杂质的含量。