在碱性介质中,以自制的Pt/C为催化剂,对邻硝基氯苯催化加氢制备2,2′-二氯氢化偶氮苯(DHB)进行研究;采用正交法对加氢还原条件进行了优化,最优条件为反应温度60℃,反应压力0.6 MPa,氢氧化钠的质量浓度为25 g/L,助催化剂用量为3%。在该条件下催化剂使用10次活性未见明显下降,所得产物DHB质量分数大于90%。 Hydrogenation of o-nitrochlorobenzene to 2,2’-dichlorohydrazobenzene (DHB) was carried out in alkaline medium with Pt / C as catalyst. Hydrogenation reduction The optimal conditions were as follows: reaction temperature 60 ℃, reaction pressure 0.6 MPa, mass concentration of sodium hydroxide 25 g / L and cocatalyst 3%. Under these conditions, no significant decrease of the activity of the catalyst for 10 times was observed, and the DHB mass fraction of the obtained product was more than 90%.