ZnFe_2O_4/ZnO气相法催化合成烷基吡嗪  

Gas-Phase Catalytic Synthesis of Alkylpyrazines on ZnFe_2O_4/ZnO

作　　者：巩宗霞 李斌[1] 张飞跃[1] 董丽辉[1] 李景林[1] 范闽光[1] 

机构地区：[1]广西大学化学化工学院,广西南宁530004

出　　处：《精细化工》2014年第4期524-528,共5页Fine Chemicals

基　　金：国家重点基础研究发展规划项目(973计划)(2012CB21500203)~~

摘　　要：改进的柠檬酸络合法制备了ZnFe2O4/ZnO催化剂,并用于乙二胺和2,3-丁二醇环化脱氢制备烷基吡嗪。用X射线衍射(XRD)、傅里叶变换红外光谱(FTIR)对催化剂进行了表征。考察了Zn/Fe摩尔比、反应温度、载气空速对2,3-丁二醇转化率和烷基吡嗪选择性的影响。结果表明,在n(Zn)∶n(Fe)=2∶1、反应温度380℃、原料液流速0.02 mL/min、载气空速1 440 h-1时,2,3-丁二醇的转化率为93.38%,烷基吡嗪的收率为85.47%,其中,2,3-二甲基吡嗪的收率为22.16%、2-甲基吡嗪的收率为63.31%。The ZnFe2O4/ZnO catalyst was prepared by an improved amorphous citric precursor method, and was applied in the eyclodehydration of diamine and 2,3-butanediol to synthesize alkylpyrazines. The catalyst was characterized by means of XRD and FTIR. The effect of Zn/Fe molar ratio, reaction temperature and carrier gas space velocity on the conversion of 2,3-butanediol and selectivity of alkylpyrazines was studied. The results indicate that the optimum conditions for the synthesis of alkylpyrazines were as follows：the molar ratio of Zn and Fe was 2：1, the reaction temperature was 380 ℃, the raw material liquid flow rate was 0.02 mL/min, and the space velocity of carrier gas was 1 440 h-1. The conversion of 2,3-butanediol was 93.38% and the selectivity of alkylpyrazines was 85.47%. The yield of 2,3-dimethylpyrazine was 22.16%. The yield of 2-methylpyrazine was 63.31%.

关 键 词：2 3-二甲基吡嗪 2-甲基吡嗪 ZnFe O4 ZNO 环化脱氢 精细化工中间体 

分 类 号：TQ426.6[化学工程] TQ253.21