涤纶催化织物的制备及其在醚合成反应中的应用

Preparation of supported polyester fabric and its application in ether synthesis reaction

摘要:

以五元丙烯酸酯共聚物为改性剂，涤纶织物为载体，通过浸轧整理制备了负载型涤纶相转移催化织物，分析了催化织物在Williamson醚合成反应中的催化性能与反应机理，考察了整理工艺、改性剂结构、负载量对催化活性的影响。结果表明，磷酸与甘油可提升改性剂分子的交联程度，从而提高催化织物的稳定性；改性剂中长链烷基酯为甲基丙烯酸十八酯、阳离子单体为甲基丙烯酰胺丙基二甲基丁基溴化铵、阳离子单体摩尔用量为13.33%、负载量为20%时，织物催化活性最佳；催化织物可吸附油相于其表面，随后引发离子交换、成键反应；在应用于不同苯酚的Williamson醚合成反应时，产率均可达92%以上，催化织物在回用10次时仍具有较高的催化活性。

Abstract:

In this paper, the supported phase transfer catalytic polyester fabric was prepared by dip-rolling with acrylate copolymer as modifier and polyester fabric as carrier. The catalytic performance and reaction mechanism for Williamson ether synthesis reaction with the catalytic fabric were analyzed. The effects of cross-linking of copolymers, length of hydrophobic alkyl chain, cationic structure, cationic content and loading amount of the modifier on the catalytic activity for the modified fabric were investigated. The results show that phosphoric acid and glycerin can improve the crosslinking degree of copolymer molecules, thus improving the catalytic stability of the catalytic fabric; the excellent catalytic activity of the modified fabric is observed when the length of hydrophobic chain ester is octadecyl ester, the cationic monomer is methylacrylamide propyldimethylbutylammonium bromide, the molar amount of the cationic monomer is 13.33% and the loading amount is 20%. The oil phase was adsorbed on the surface of the catalytic fabric, and the ion-exchange and bonding reactions were initiated. In Williamson ethers synthesis reaction with different phenols, the conversion rate can reach more than 92%. The catalytic activity has no obvious change after reused 10 times.