二元S_(2)O_(8)^(2-)/TiO_(2)-Fe_(3)O_(4)固体超强酸催化剂催化合成乙酸乙酯  

Synthesis of ethyl acetate catalyzed by binary S_(2)O_(8)^(2-)/TiO_(2)-Fe_(3)O_(4) solid superacid catalyst

作　　者：解文功 吴田甜 闫锋[2] XIE Wen-gong;WU Tian-tian;YAN Feng(Yili Xintian Coal Chemical Company Limited,Yining 839300,China;School of Petrochemical Engineering,Liaoning Petrochemical University,Fushun 113001,China)

机构地区：[1]伊犁新天煤化工有限责任公司,新疆伊宁839300 [2]辽宁石油化工大学石油化工学院,辽宁抚顺113001

出　　处：《石化技术与应用》2025年第2期105-110,共6页Petrochemical Technology & Application

基　　金：国家科技重大专项课题任务(项目编号:2016ZX05010-004-005)。

摘　　要：采用沉淀-浸渍法制备出新型二元S_(2)O_(8)^(2-)/TiO_(2)-Fe_(3)O_(4)固体酸催化剂,对其进行红外光谱、X射线衍射、N_(2)吸附脱附、NH_(3)物理吸附表征,并用于合成乙酸乙酯。结果表明:合成的催化剂为固体超强酸催化剂,晶型完整;在Fe_(3)O_(4)质量分数为0.35%,(NH_(4))_(2)S_(2)O_(8)浓度为0.75 mol/L,600℃焙烧3 h的条件下,制得的催化剂催化效果最佳;在n(乙醇)/n(乙酸)为3∶1,固体超强酸催化剂用量为0.6 g,酯化时间为2.5 h的最佳工艺条件下,该催化剂合成乙酸乙酯的酯化率可达91%。A novel binary S_(2)O_(8)^(2-)/TiO_(2)-Fe_(3)O_(4) solid acid catalyst was prepared by precipitation-impregnation method,characterized by infrared spectroscopy,X-ray diffraction,N_(2) adsorption and desorption,NH_(3) physical adsorption and used for the synthesis of ethyl acetate.The results showed that synthesized catalyst was a solid superacid catalyst with complete crystal structure.Under the condition of mass fraction of Fe_(3)O_(4) in the catalyst was 0.35%,the concentration of(NH_(4))_(2)S_(2)O_(8) was 0.75 mol/L,calcined at 600℃ for 3 h,the catalytic effect was the best.The optimal process conditions for synthesizing ethyl acetate using this catalyst were:alcohol to acid ratio of 3∶1,solid superacid catalyst dosage of 0.6 g,esterification time of 2.5 h,and esterification rate of 91%.

关 键 词：固体酸催化剂 超强酸 二元 乙酸乙酯 酯化率 

分 类 号：O643.36[理学—物理化学]