Recycling and Reuse of Ionic Liquid in Homogeneous Cellulose Acetylation

doi:10.1016/S1004-9541(13)60524-8

Chin.J.Chem.Eng. ›› 2013, Vol. 21 ›› Issue (5): 577-584.DOI: 10.1016/S1004-9541(13)60524-8

• MATERIALS AND PRODUCT ENGINEERING • Previous Articles

Recycling and Reuse of Ionic Liquid in Homogeneous Cellulose Acetylation

HUANG Kelin^1,2, WU Rui², CAO Yan³, LI Huiquan³, WANG Jinshu¹

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

Received:2012-03-07 Revised:2012-09-15 Online:2013-05-31 Published:2013-05-28
Supported by:
Supported by the Major Project of the State Key Development Program for Basic Research of China (2009CB219901) and the National Natural Science Foundation of China (21006118).

Recycling and Reuse of Ionic Liquid in Homogeneous Cellulose Acetylation

黄科林^1,2, 吴睿², 曹妍³, 李会泉³, 王金淑¹

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

通讯作者: LI Huiquan
基金资助:
Supported by the Major Project of the State Key Development Program for Basic Research of China (2009CB219901) and the National Natural Science Foundation of China (21006118).

Abstract

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.

Key words: cellulose, ionic liquid, molecular distillation, recycling

摘要： 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.

关键词: cellulose, ionic liquid, molecular distillation, recycling

HUANG Kelin, WU Rui, CAO Yan, LI Huiquan, WANG Jinshu. Recycling and Reuse of Ionic Liquid in Homogeneous Cellulose Acetylation[J]. Chin.J.Chem.Eng., 2013, 21(5): 577-584.

黄科林, 吴睿, 曹妍, 李会泉, 王金淑. Recycling and Reuse of Ionic Liquid in Homogeneous Cellulose Acetylation[J]. Chinese Journal of Chemical Engineering, 2013, 21(5): 577-584.

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Recycling and Reuse of Ionic Liquid in Homogeneous Cellulose Acetylation

Recycling and Reuse of Ionic Liquid in Homogeneous Cellulose Acetylation

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