分子氧氧化二甘醇合成二甘酸

Preparation of Diglycolic acid via Molecular oxygen oxidation of Diethylene glycol

摘要:

摘 要：以水为溶剂，氧气为氧化剂，经Bi修饰的Pt/C为催化剂液相催化氧化二甘醇合成二甘酸，并利用红外光谱及核磁共振氢谱等对产物进行了表征。探讨了反应温度、反应时间、底物与催化剂质量比、水与底物体积比、氧气流量等因素对实验的影响。实验结果表明：最佳的实验条件是，反应温度80℃，反应时间为8h，底物和催化剂的质量比为30，水和底物的体积比为30，氧气流量为40ml/min。在该反应条件下，二甘酸的平均收率为95.0%，催化剂重复使用6次活性未见显著降低。

Abstract:

Abstract :Diglycolic acid has been synthesized by the reaction of diethylene glycol and oxygen under heterogeneous conditions using water as solvent and Bi-Pt/C as catalyst.The structure of the product is confirmed by IR,1NMR spectra,etc.Effect of reaction temperature, volumes of solvents, amounts of catalysts , amounts of oxygen and reaction time have been studied.The optimum conditions are found as follows:reaction temperature 80℃,reaction time 8h, mass ratio substrate and catalyst 30,volume ratio water and substrate 30,oxygen flow 40ml/min.Under these conditions, the average yield of diglycolic acid is 95.0%.The catalyst can not be significant decreased in the terms of catalytic activity after six recycles.