Refining method of N, N'-bis(2, 2, 6, 6-tetramethyl-4-piperidyl)-1, 6-hexamethylenediamine

The invention provides a refining method of N,N'-bis(2, 2, 6, 6-tetramethyl-4-piperidyl)-1, 6-hexamethylenediamine. The method comprises the following steps: taking 2, 2, 6, 6-tetramethyl-4-piperidone and 1,6-hexamethylenediamine as raw materials to react to prepare an N,N'-bis(2, 2, 6, 6-tetramethyl-4-piperidyl)-1, 6-hexamethylenediamine reaction solution; rectifying the reaction solution, and evaporating out light components and a crude product; and recrystallizing the crude product in a second solvent to obtain a target product. According to the invention, the purification process is effectively simplified, the problem of complex process caused by repeated concentration and crystallization of the crystallization mother liquor is avoided, and the product has more stable performance, can be stored for a long time and is not easy to discolor. 本发明提供了一种N,N'-二(2,2,6,6-四甲基-4-哌啶基)-1,6-己二胺的精制方法。该方法包括：以2,2,6,6-四甲基-4-哌啶酮和1,6-己二胺为原料进行反应制备得到N,N'-二(2,2,6,6-四甲基-4-哌啶基)-1,6-己二胺反应液；将所述反应液进行精馏，蒸出轻组分和粗品；将粗品置于第二溶剂中进行重结晶，得到目标产品