近临界水中苯甲醛合成新方法  

A Novel Process for Synthesis of Benzaldehyde in Near-critical Water

作　　者：高飞[1] 吕秀阳[1] 

机构地区：[1]浙江大学化学工程与生物工程学系制药工程研究所,浙江杭州310027

出　　处：《高校化学工程学报》2006年第4期544-547,共4页Journal of Chemical Engineering of Chinese Universities

基　　金：国家自然科学基金项目(20176054;20476089)。

摘　　要：测定了压力15MPa下，温度240-320℃范围内肉桂醛水解反应的动力学数据。实验结果表明在无任何外加催化剂的情况下，肉桂醛能够在近临界水中顺利进行水解反应生成苯甲醛，苯甲醛产率随时间的延长先增大后减小。随温度升高，水解反应速率迅速增大，苯甲醛产率达到最大值的时间缩短。得到较佳反应条件为15MPa、280℃、反应时间6h，此时苯甲醛产率为57．0％（mol）。由Arrhenius方程，拟合得到肉桂醛水解反应的活化能为59．8kJ·mol^-1。本方法制备的苯甲醛由于没有引入其它反应物，因此香气品质较佳。A novel process for synthesis of benzaldebyde in near-critical water （NCW） without using any catalyst was proposed. The experiments show that, without the help of catalyst, the cinnamaldehyde can be hydrolyzed to form benzaldehyde in the NCW. During the hydrolysis, the product yield fast increases and then declines with the residence time of the reaction, and as the temperature increases, the reaction rate undergoes a dramatic increase, which results in shorter the reaction time for obtaining the maximum product yield. Over 57.0%（mole） yield of benzaldehyde could be reached under the optimized conditions of 280℃, 15 MPa and 6b residence time. The kinetics of non-catalyzed hydrolysis of cinnamaldehyde in water at 15 MPa and temperature from 249℃ to 320℃ was investigated and the activation energy evaluated from the Arrhenius equation is 59.8 kJ·mol^-1. Without introducing any other reagents in the reaction, the proposed novel process for synthesis of benzaldehyde in NCW offers not only an environmentally friendly, but also well conserved natural properties for benzaldehyde.

关 键 词：近临界水 肉桂醛 苯甲醛 水解 动力学 

分 类 号：TQ031.5[化学工程] O643.12[理学—物理化学]