季铵盐在胶束催化肉桂醛水解中的作用  

Role of Quaternary Ammonium Salt in Hydrolysis of Cinnamaldehyde as Mediated by Micelles

作　　者：陈良坦[1] 张显[1] 翟庆阁[1] 王静[1] 

机构地区：[1]厦门大学化学系,福建厦门361005

出　　处：《精细化工》2010年第4期335-337,352,共4页Fine Chemicals

基　　金：福建省重点科技项目(99-Z-53)~~

摘　　要：测定了十六烷基三甲基溴化铵(CTAB)胶束体系中不同温度及碱浓度下的肉桂醛水解反应速率,比较了四丁基溴化铵(TBAB)对CTAB、十二烷基硫酸钠(SDS)、聚氧乙烯月桂醚(Brij-35)胶束体系中肉桂醛水解转化率的影响。实验结果表明,当0.003 mol/L<c(CTAB)<0.02 mol/L时,肉桂醛水解反应中碱的浓度可从0.1 mol/L下降至0.02 mol/L、反应温度可从318 K下降至298 K,而胶束体系中的反应速率常数基本等于非胶束体系;肉桂醛的转化率(η)依次为η(CTAB+TBAB)>η(Brij-35+TBAB)>η(CTAB)>η(Brij-35)>η〔non-(surfactant+TBAB)〕>η(SDS+TBAB)>η(SDS),且随着TBAB浓度的增加,各胶束体系中肉桂醛的转化率均增大,表明TBAB与胶束催化之间存在着协同作用,它能提高胶束催化的效率。This paper determines the reaction rate constant of the hydrolysis of cinnamaldehyde in the cetyltrimethylammonium bromide（CTAB） micellar system at different alkaline concentrations and temperatures,and investigates the effects of tetrabutyl ammonium bromide（TBAB） on the hydrolysis of cinnamaldehyde in the CTAB,sodium dodecyl sulfate（SDS）,polyoxyethylene laurel ether（Brij-35） micellar system respectively.The experimental results demostrate that the reaction rate in CTAB micellar solution is equivalent to that of non-micelle system but the alkaline concentration and temperature can reduce from 0.1 mol/L to 0.02 mol/L,from 318 K to 298 K respectively,when c（CTAB） is between 0.003 mol/L and 0.02 mol/L.The conversion（η） of cinnamaldehyde is η（CTAB＋TBAB）η（Brij-35＋TBAB）η（CTAB）η（Brij-35）η（（non-（surfactant＋TBAB））η（SDS＋TBAB）η（SDS）.When the c（TBAB） increases,the conversion of all micellar systems raises.This indicates there is a synergistic effect between TBAB and micellar catalysis,which could improve the conversion.

关 键 词：胶束催化 四丁基溴化铵 转化率 表面活性剂 

分 类 号：O648[理学—物理化学]