Recycling and Reuse of Ionic Liquid in Homogeneous Cellulose Acetylation |
| |
Authors: | HUANG Kelin WU Rui CAO Yan LI Huiquan WANG Jinshu |
| |
Affiliation: | 1.School of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China;2.Guangxi Branch of China Academy of Science and Technology Development, Nanning 530022, China;3.Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China |
| |
Abstract: | Molecular distillation was used to recover ionic liquid (IL) 1-allyl-3-methylimidazolium chloride (AmimCl) in homogeneous cellulose acetylation. The five factors that affect the separation efficiency of molecular distillation, namely, feed flow rate, distillation temperature, feed temperature, wiper rotating speed, and distillation pressure, are discussed. The optimal recovery condition was determined via orthogonal experiments using an OA9(34) design. The IL was recycled and reused 5 times in the homogeneous cellulose acetylation system under optimal conditions. The purity of recycled IL the 5th time reached 99.56%. FT-IR (Fourier transform infrared spectroscopy) and 1H NMR (nuclear magnetic resonance) spectroscopy showed that the structure of the recovered IL is not changed. This work proves that AmimCl has excellent reusability, and that molecular distillation is an effective method for recovering IL in homogeneous cellulose acetylation. |
| |
Keywords: | cellulose ionic liquid molecular distillation recycling |
本文献已被 万方数据 ScienceDirect 等数据库收录! |
| 点击此处可从《中国化学工程学报》浏览原始摘要信息 |
|
点击此处可从《中国化学工程学报》下载全文 |
|