Recycling and Reuse of Ionic Liquid in Homogeneous Cellulose Acetylation

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 rotatin...

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Bibliographic Details
Published in:Chinese journal of chemical engineering 2013-05, Vol.21 (5), p.577-584
Main Author: 黄科林 吴睿 曹妍 李会泉 王金淑
Format: Article
Language:English
Subjects:
Acetylation
Cellulose
Distillation
ionic liquid
Ionic liquids
molecular distillation
Nuclear magnetic resonance
Optimization
Recovering
Recycled
recycling
乙酰化
傅里叶变换红外光谱
再利用
分子蒸馏技术
回收
均相
离子液体
纤维素
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Summary: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.
ISSN:1004-9541
2210-321X
DOI:10.1016/S1004-9541(13)60524-8