Pt/C催化剂催化邻氯硝基苯加氢制备2，2′-二氯氢化偶氮苯

摘要

Using o-nitrochlorobenzene as the raw material,2,2′-dichlorohydrazobenzene was prepared in the alkaline medium over Pt/C catalyst. The effects of the solvents,reaction pressure,reaction tempera-tures and sodium hydroxide concentration on the hydrogenation reaction was investigated. The optimum reaction condition was determined. The results showed that 2,2′-dichlorohydrazobenzene yield of more than 88% was obtained under the condition as follows:reaction temperature 80 ℃,reaction pressure 0. 8 MPa, sodium hydroxide mass fraction 20%,and toluene-sodium hydroxide mixture solution as the solvent. Com-pared with conventional processes of sulfide reduction and reduction of iron powder,the catalytic hydrogenation had more advantages with respect to reducing waste water and production cost.%以邻氯硝基苯为原料，在碱性环境中以Pt/C为催化剂，进行加氢还原生成2，2′-二氯氢化偶氮苯。考察溶剂、反应压力、反应温度及氢氧化钠浓度等对加氢反应的影响，确定了最佳的工艺条件，在氢氧化钠浓度20%、甲苯/氢氧化钠溶液作溶剂、反应温度80℃和反应压力0.8 MPa条件下，2，2′-二氯氢化偶氮苯收率超过88%。与传统硫化碱还原或铁粉还原工艺相比，催化加氢法在减少废水和降低成本等方面优势较大。