摘要
以改性钛基固体酸为催化剂催化合成柠檬酸三丁酯,确定了酯化优化条件。试验结果表明:在催化剂5 0%(以柠檬酸为基数的质量百分比),柠檬酸0 1mol,丁醇0 55mol,反应温度100～150℃,反应时间90min的条件下,柠檬酸的酯化率达到99 2%以上。基于布朗斯特酸碱理论,结合过渡金属丰富的轨道能级结构,对改性钛基固体酸催化剂的催化活性的成因进行了分析,并以吡啶作为探针分子通过红外光谱法检测了该固体酸的表面酸性质和以XRD分析了催化剂的晶相结构。
The modified titanium base solid acid used as catalyst for the synthesis of tributyl citrate from citric acid and butyl alcohol was investigated in this paper.The catalyst showed high catalytic activity.The optimal conditions were as follows:the reaction time was 90 min,temperature was 100～150℃,the catalyst quantity (W titanium base solid acid/W citric acid) was 5.0% and the mole ratio of reactants was n (citric acid).n (butyl alcohol) =1︰5.5. Yield of esterification was 99.2%.The catalytic activity of the modified titanium base solid acid has been discussed in terms of the orbit structure of the sufficient energy-level of transition metal ions and Br?nsted acid-base theory.IR spectra of pyridine adsorption showed the presence of Br?nsted acid sites on its surface and X-ray diffraction analyzed the crystalloid structure.
出处
《化学与粘合》
CAS
2005年第3期179-182,共4页
Chemistry and Adhesion
