对氨基苯酚合成用酸性季鏻盐离子液体催化剂的制备及性能

Preparation and Catalytic Performance of Acidic Quaternary Phosph-Onium Salt Ionic Liquid to Synthesize P-Aminophenol

合成了新型的酸性季鏻盐型离子液体(IL)取代传统的硫酸催化剂,并与Pt/C催化剂构成双催化剂体系用于硝基苯催化加氢一步合成对氨基苯酚(PAP)的反应。在4种酸性季鏻盐离子液体中,三苯基膦季鏻硫酸氢盐[HSO3(CH2)4P(Ph)3]HSO4的催化性能要优于三苯基膦季鏻三氟甲磺酸盐[HSO3(CH2)4P(Ph)3]CF3SO3、三苯基膦季鏻对甲苯磺酸盐[HSO3(CH2)4P(Ph)3]CH3(C6H4)SO3和三丁基膦季鏻硫酸氢盐[HSO3(CH2)4P(C4H9)3]HSO4。在85℃、0.2MPa、4 h、Pt/C 0.2 g、硝基苯(NB)3.5 g,ILs 40 mL(m(IL)/m(NB)=7)、1 000 r/min的反应条件下,硝基苯转化率为86.54%,对氨基苯酚的收率为48.98%。同时,该双催化剂体系可以重复使用。

A novel ionic liquid of acidic quaternary phosphonium salt type was synthesized to instead of sulfuric acid was investigated,and it with Pt/C form bi-catalyst system and was used for the one step synthesis of p-aminophenol by catalytic hydrogenation of nitrobenzene.Among the four acidic quaternary phosphonium salt ionic liquids,catalytic performance of [HSO3(CH2)4P(Ph)3]HSO4 is superior to [HSO3(CH2)4P(Ph)3]CF3SO3,[HSO3(CH2)4P(Ph)3]CH3(C6H4)SO3 and [HSO3(CH2)4P(C4H9)3]HSO4.Under the reaction conditions of 85 ℃,0.2 MPa,4 h,Pt/C 0.2 g,NB 3.5 g,Ils 40 mL(m(IL)/m(NB)=7),1 000 r/min,nitrobenzene conversion was 86.54% and paminophenol yield was 48.98%.The experimental results indicated that the bi-catalyst system can be reused.