Pervaporation is an effective technique to improve the conversion of acetic acid in the esterification reaction through in situ removing the product water. In this study, a co-solvent assisted contra-diffusion strategy was used to prepare covalent organic framework (COF) pervaporation membrane on the polyacrylonitrile porous substrate. Fatty alcohol was used as the co-solvent in the organic phase to tune the reaction region. Subsequently, the COFs were formed in the sub-surface of the substrate to form a nanoconfined composite membrane, which was then modified by polyvinyl alcohol through spinning coating. The obtained COF composite membranes were used to in situ remove water during the esterification from acetic acid and ethanol. Consequently, compared with the esterification without pervaporation, the conversion of acetic acid was enhanced from 74% to 90%, which exhibited an excellent intensification for the esterification reaction.

渗透蒸发是通过原位去除产物水来提高酯化反应中乙酸转化率的有效技术。本研究采用共溶剂辅助反扩散策略在聚丙烯腈多孔基材上制备共价有机骨架（COF）渗透汽化膜。使用脂肪醇作为有机相中的共溶剂来调节反应区域。随后，在基底的亚表面形成COF，形成纳米复合膜，然后通过旋涂法用聚乙烯醇对其进行改性。所获得的COF复合膜用于在乙酸和乙醇的酯化过程中原位去除水。因此，与没有全蒸发的酯化反应相比，乙酸的转化率从74%提高到90%，这对酯化反应表现出优异的强化作用。